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Contract With Customer Assets And Liabilities Policy [Text Block] Contract Balances Accrued liabilities and other, net Increase (Decrease) in Other Operating Liabilities Increase (Decrease) in Other Operating Liabilities, Total Current liabilities measurement period adjustments Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current liabilities Business combination, provisional information, initial accounting incomplete, adjustment, current liabilities. Business Combination [Domain] Change in Accounting Principle Policy [Policy Text Block] Change in accounting principle policy. Change in Accounting Principle Middle East [Member] Middle East Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Shares withheld for taxes Asset Class [Axis] Line of Credit Facility, Initiation Date Agreement date Payment, Tax Withholding, Share-Based Payment Arrangement Shares withheld for taxes Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Granted Business Combination, Recognized Liability Assumed, Other Liability, Current Accrued liabilities Current assets: Assets, Current [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Excise tax on share repurchases. Excise tax on share repurchases Excise Tax on Share Repurchases Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding Common stock, shares outstanding Beginning balance Ending balance Total stockholders' equity Equity, Including Portion Attributable to Noncontrolling Interest Statement of Comprehensive Income [Abstract] Business Combination [Line Items] Net purchase price, net of cash acquired Business Combination, Consideration Transferred Net purchase price, net of cash acquired Revenue from Contract with Customer [Policy Text Block] Revenue Other long-term liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Other long-term liabilities Stock Repurchased and Retired During Period, Shares Number of shares repurchased Common stock retired, shares Common stock retired, shares Operating Lease, Liability, Noncurrent Long-term operating lease liabilities Increase In Aggregate Principal Amount Increase In Aggregate Principal Amount Increase in aggregate principal amount Revision of Prior Period [Domain] Other Accrued Liabilities, Current Other Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock Additional paid-in capital Security Exchange Name Security Exchange Name Measurement Input Type [Axis] Rental revenue Revenues Revenues, Total Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Entity Address, State or Province Entity Address, State or Province Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Tax Liabilities Business combination, provisional information, initial accounting incomplete, adjustment, deferred income tax liabilities. Deferred income tax liabilities measurement period adjustments Operating right-of-use assets Operating Lease, Right-of-Use Asset Amendment Flag Amendment Flag Share-Based Payment Arrangement [Text Block] Stock-based Compensation and Outstanding Awards Midstream [Member] Midstream [Member] Midstream. Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Other (expense) income, net Other (expense) income Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate Sofr Overnight Index Swap Rate Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total City Area Code City Area Code Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Other, net Outside U.S. Inventory at Average Cost Outside U.S. inventory at average cost. Outside U.S. inventory at average cost Organization, Consolidation and Presentation of Financial Statements [Abstract] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustments, net of tax Inventory Disclosure [Text Block] Inventories, net Long-Lived Asset, Including Intangible Asset and Goodwill, Impairment and Disposal [Policy Text Block] Long-lived Assets, Excluding Goodwill and Indefinite-lived Intangible Assets Common Stock, Par or Stated Value Per Share Common stock, par value common stock per share Loss Contingency, Pending Claims, Number Loss contingency pending claims number Tabular disclosure of shares repurchased. Schedule of Shares Repurchased [Table Text Block] Schedule of Shares Repurchased Liabilities, Current Current liabilities Total current liabilities Noncash Investing and Financing Items [Abstract] Non-cash investing and financing activities: International Segment [Member] International Segment [Member] International Segment [Member] Segment Reporting [Text Block] Business Segments Trading Symbol Trading Symbol Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncontrolling Interests Business combination, provisional information, initial accounting incomplete, adjustment, noncontrolling interests. Noncontrolling interests measurement period adjustments Number of Business Locations Number of business locations. Number of business locations Geographical [Axis] Geographical Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Stock based awards, shares granted Entity Emerging Growth Company Entity Emerging Growth Company Additional Paid-in Capital [Member] Additional Paid-In Capital [Member] Plan Plan Name [Domain] Inventory, LIFO Reserve Less: Excess of average cost over LIFO cost (LIFO reserve) Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable Business combination, provisional information, initial accounting incomplete, adjustment, accounts payable. Accounts payable measurement period adjustments Other Liabilities, Noncurrent, Total Other Liabilities, Noncurrent Other long-term liabilities Share-Based Payment Arrangement, Tranche One [Member] First Anniversary [Member] Business Combination [Table] Revision of Prior Period [Axis] Cover [Abstract] Business Combination, Consideration Transferred, Equity Interest, Share Issued, Value Equity consideration for the conversion of MRC Global common stock outstanding Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Unused portion of commitment fee range Noncontrolling interest Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Noncontrolling Interest Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Noncontrolling Interest Noncontrolling interest Equity, Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Total Noncontrolling interests Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Assets and Liabilities Assumed and Recognized Intangible assets Revenue from Contract with Customer [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss), Ending balance Accumulated other comprehensive income (loss), Beginning balance Accumulated other comprehensive loss Share-Based Payment Arrangement, Noncash Expense, Total Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Business Combination, Contingent Consideration, Change in Contingent Consideration, Asset, Increase (Decrease) Adjustments based acquisition assets Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalent Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Stock Repurchased and Retired During Period, Value Common stock retired Noncontrolling Interest [Member] Noncontrolling Interests [Member] Accumulated Other Comprehensive Income (Loss) [Table] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash used in financing activities Business Combination, Recognized Liability Assumed, Accounts Payable, Current Accounts payable Accounts payable Payables and Accruals [Abstract] Last In First Out (LIFO) Method [Member] Last In First Out (LIFO) method. Last-In, First-Out (LIFO) [Member] Acquisition Measurement Period Adjustment Acquisition measurement period adjustment. Acquisition measurement period adjustment Net income (loss) attributable to the Company's stockholders Net Income (Loss) Available to Common Stockholders, Basic Net (loss) income attributable to DNOW Inc. stockholders Entity Filer Category Entity Filer Category Increase (Decrease) in Accounts Receivable Receivables Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Numerator: Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Property, plant and equipment, net Property, plant and equipment, net Revenue Total Revenue Revenue from Contract with Customer, Excluding Assessed Tax, Total Revenue from Contract with Customer, Excluding Assessed Tax Shares, Outstanding Beginning balance, shares Ending balance, shares Inventory Disclosure [Abstract] Segment Reporting [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Statement of Financial Position [Abstract] Local Phone Number Local Phone Number