Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes On May 1, 2014, the National Oilwell Varco, Inc. (“NOV”) Board of Directors approved the Spin-Off (the “Spin-Off” or “Separation”) of its distribution business into an independent, publicly traded company named NOW Inc. In connection with the Separation, the Company and NOV entered into a Tax Matters Agreement, dated as of May 29, 2014 (the “Tax Matters Agreement”). The Tax Matters Agreement sets forth the Company and NOV’s rights and obligations related to the allocation of federal, state, local and foreign taxes for periods before and after the Spin-Off, as well as taxes attributable to the Spin-Off, and related matters such as the filing of tax returns and the conduct of IRS and other audits. Pursuant to the Tax Matters Agreement, NOV has prepared and filed the consolidated federal income tax return, and any other tax returns that include both NOV and the Company for all the liability periods ended on or prior to May 30, 2014. NOV will indemnify and hold harmless the Company for any income tax liability for periods before the Separation date. The Company will prepare and file all tax returns that include solely the Company for all taxable periods ending after that date. Settlements of tax payments between NOV and the Company were generally treated as contributions from or distributions to NOV in periods prior to the Separation date. The effective tax rate for the three months ended March 31, 2018 was 24.1%, compared to 1.8% for the same period in 2017. Compared to the U.S. statutory rate, the effective tax rate was impacted by recurring items, such as higher tax rates on income earned in foreign jurisdictions that is permanently reinvested, nondeductible expenses, state income taxes, the effects of the enactment of the Tax Cuts and Jobs Act and the change in valuation allowance recorded against deferred tax assets. Due to the continuing uncertainty in the Company’s industry and thus the Company’s outlook, the Company continues to utilize the method of recording income taxes on a year-to-date effective tax rate for the three months ended March 31, 2018. The Company will evaluate its use of this method each quarter until such time as a return to the annualized estimated effective tax rate method is deemed appropriate. Provisional Amounts in the Effective Tax Rate The Tax Cuts and Jobs Act was enacted on December 22, 2017. The Tax Cuts and Jobs Act contains several tax law changes that will impact the Company in the current and future periods, including a reduction in the U.S. federal corporate tax rate from 35% to 21%, requiring companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, creating new taxes on certain foreign sourced earnings and changes to bonus depreciation, the deduction for executive compensation and interest expense. The Company is applying the guidance in SAB 118 when accounting for the enactment-date effects of the Tax Cuts and Jobs Act. At March 31, 2018, the Company has not completed its accounting for all of the tax effects of the Tax Cuts and Jobs Act; however, in certain cases, as described below, the Company has made a reasonable estimate of other effects. As further discussed below, during the three-month period ended March 31, 2018, the Company recognized adjustments of $9 million to the provisional amounts recorded at December 31, 2017 related to the one-time transition tax and the reduction in the corporate income tax rate. The Company will continue to refine its calculations as additional analysis is completed. The Company originally remeasured its U.S. deferred tax assets and liabilities and recorded a $69 million charge relating to the U.S. federal corporate income tax rate change, with a corresponding decrease to its valuation allowance of $69 million. Similarly, the Company originally recorded a $33 million charge for the one-time, mandatory transition tax on unremitted foreign earnings which was fully offset by foreign tax credits and net operating losses. There was no net impact to the Company’s provision for income taxes for these entries at December 31, 2017. Subsequent guidance was issued by the Treasury Department and Internal Revenue Service in Notice 2018-26 which clarifies that companies may elect out of using 2017 net operating losses when computing the one-time, mandatory transition tax. The Company refined its one-time mandatory transition tax calculation, and while the election does not impact the $33 million charge originally recorded, it results in the Company utilizing additional foreign tax credits and preserves the Company’s 2017 net operating loss. The Company remeasured its 2017 net operating loss deferred tax asset and recorded an additional charge of $9 million relating to the U.S. federal corporate income tax rate change with a corresponding decrease to its valuation allowance of $9 million. There was no net impact to the Company’s provision for income taxes related to this adjustment at March 31, 2018. The Tax Cuts and Jobs Act subjects a U.S. shareholder to current tax on Global Intangible Low Taxed Income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5 Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and recognized a provisional tax expense of $1 million related to GILTI, which is fully offset by current year U.S. tax losses. The reduction in the Company’s U.S. tax net operating loss resulted in a corresponding decrease in the Company’s valuation allowance. There was no net impact to the Company’s provision for income taxes related to GILTI for the three-month period ended March 31, 2018. The Tax Cuts and Jobs Act imposes a new Base Erosion and Anti-Abuse Tax (“BEAT”) on certain corporations that make base erosion payments to related foreign persons. The Company has evaluated the BEAT provisions and has concluded that its base erosion payments fall below the threshold, making it exempt from the BEAT. The Company will continue to evaluate the BEAT and provide for disclosure if it becomes subject to the BEAT in the future. To the extent penalties and interest would be assessed on any underpayment of income tax, such accrued amounts would be classified as a component of income tax provision (benefit) in the financial statements consistent with the Company’s policy. The Company is subject to taxation in the United States, various states and foreign jurisdictions. The Company has significant operations in the United States and Canada and to a lesser extent in various other international jurisdictions. Tax years that remain subject to examination by major tax jurisdictions vary by legal entity, but are generally open in the U.S. for the tax years ending after 2013 and outside the U.S. for the tax years ending after 2011. The Company is indemnified for any income tax exposures related to the periods prior to the Separation under the Tax Matters Agreement with NOV.

8. Income Taxes

On May 1, 2014, the National Oilwell Varco, Inc. (“NOV”) Board of Directors approved the Spin-Off (the “Spin-Off” or “Separation”) of its distribution business into an independent, publicly traded company named NOW Inc. In connection with the Separation, the Company and NOV entered into a Tax Matters Agreement, dated as of May 29, 2014 (the “Tax Matters Agreement”). The Tax Matters Agreement sets forth the Company and NOV’s rights and obligations related to the allocation of federal, state, local and foreign taxes for periods before and after the Spin-Off, as well as taxes attributable to the Spin-Off, and related matters such as the filing of tax returns and the conduct of IRS and other audits. Pursuant to the Tax Matters Agreement, NOV has prepared and filed the consolidated federal income tax return, and any other tax returns that include both NOV and the Company for all the liability periods ended on or prior to May 30, 2014. NOV will indemnify and hold harmless the Company for any income tax liability for periods before the Separation date. The Company will prepare and file all tax returns that include solely the Company for all taxable periods ending after that date. Settlements of tax payments between NOV and the Company were generally treated as contributions from or distributions to NOV in periods prior to the Separation date.

The effective tax rate for the three months ended March 31, 2018 was 24.1%, compared to 1.8% for the same period in 2017. Compared to the U.S. statutory rate, the effective tax rate was impacted by recurring items, such as higher tax rates on income earned in foreign jurisdictions that is permanently reinvested, nondeductible expenses, state income taxes, the effects of the enactment of the Tax Cuts and Jobs Act and the change in valuation allowance recorded against deferred tax assets. Due to the continuing uncertainty in the Company’s industry and thus the Company’s outlook, the Company continues to utilize the method of recording income taxes on a year-to-date effective tax rate for the three months ended March 31, 2018. The Company will evaluate its use of this method each quarter until such time as a return to the annualized estimated effective tax rate method is deemed appropriate.

Provisional Amounts in the Effective Tax Rate

The Tax Cuts and Jobs Act was enacted on December 22, 2017. The Tax Cuts and Jobs Act contains several tax law changes that will impact the Company in the current and future periods, including a reduction in the U.S. federal corporate tax rate from 35% to 21%, requiring companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, creating new taxes on certain foreign sourced earnings and changes to bonus depreciation, the deduction for executive compensation and interest expense. The Company is applying the guidance in SAB 118 when accounting for the enactment-date effects of the Tax Cuts and Jobs Act. At March 31, 2018, the Company has not completed its accounting for all of the tax effects of the Tax Cuts and Jobs Act; however, in certain cases, as described below, the Company has made a reasonable estimate of other effects. As further discussed below, during the three-month period ended March 31, 2018, the Company recognized adjustments of $9 million to the provisional amounts recorded at December 31, 2017 related to the one-time transition tax and the reduction in the corporate income tax rate. The Company will continue to refine its calculations as additional analysis is completed.

The Company originally remeasured its U.S. deferred tax assets and liabilities and recorded a $69 million charge relating to the U.S. federal corporate income tax rate change, with a corresponding decrease to its valuation allowance of $69 million. Similarly, the Company originally recorded a $33 million charge for the one-time, mandatory transition tax on unremitted foreign earnings which was fully offset by foreign tax credits and net operating losses. There was no net impact to the Company’s provision for income taxes for these entries at December 31, 2017.

Subsequent guidance was issued by the Treasury Department and Internal Revenue Service in Notice 2018-26 which clarifies that companies may elect out of using 2017 net operating losses when computing the one-time, mandatory transition tax. The Company refined its one-time mandatory transition tax calculation, and while the election does not impact the $33 million charge originally recorded, it results in the Company utilizing additional foreign tax credits and preserves the Company’s 2017 net operating loss. The Company remeasured its 2017 net operating loss deferred tax asset and recorded an additional charge of $9 million relating to the U.S. federal corporate income tax rate change with a corresponding decrease to its valuation allowance of $9 million. There was no net impact to the Company’s provision for income taxes related to this adjustment at March 31, 2018.

The Tax Cuts and Jobs Act subjects a U.S. shareholder to current tax on Global Intangible Low Taxed Income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5 Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. Given the complexity of the GILTI provisions, the Company is still evaluating the effects of the GILTI provisions and recognized a provisional tax expense of $1 million related to GILTI, which is fully offset by current year U.S. tax losses. The reduction in the Company’s U.S. tax net operating loss resulted in a corresponding decrease in the Company’s valuation allowance. There was no net impact to the Company’s provision for income taxes related to GILTI for the three-month period ended March 31, 2018.

The Tax Cuts and Jobs Act imposes a new Base Erosion and Anti-Abuse Tax (“BEAT”) on certain corporations that make base erosion payments to related foreign persons. The Company has evaluated the BEAT provisions and has concluded that its base erosion payments fall below the threshold, making it exempt from the BEAT. The Company will continue to evaluate the BEAT and provide for disclosure if it becomes subject to the BEAT in the future.

To the extent penalties and interest would be assessed on any underpayment of income tax, such accrued amounts would be classified as a component of income tax provision (benefit) in the financial statements consistent with the Company’s policy.

The Company is subject to taxation in the United States, various states and foreign jurisdictions. The Company has significant operations in the United States and Canada and to a lesser extent in various other international jurisdictions. Tax years that remain subject to examination by major tax jurisdictions vary by legal entity, but are generally open in the U.S. for the tax years ending after 2013 and outside the U.S. for the tax years ending after 2011. The Company is indemnified for any income tax exposures related to the periods prior to the Separation under the Tax Matters Agreement with NOV.