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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 25, 2020 Installment $ / shares shares | Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted | 1,650,262 |  |
Stock options fair value | $ / shares | $ 5.83 |  |
Stock options exercise price | $ / shares | $ 20.23 |  |
Income tax benefit recognized | $ |  | $ 0 | $ 4
Restricted Stock and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 2,535,174 |  |
Restricted stock granted fair value | $ / shares | $ 20.23 |  |
Number of equal annual vesting installments | Installment | 3 |  |
Duration of performance-based restricted stock awards, vested |  | The restricted stock and restricted stock units vest in three equal annual installments commencing on the first anniversary of the grant date. |
Performance-base restricted stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Description of performance goal |  | The 2020 performance share awards can be earned based on performance against two established goals over a three-year performance period. |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
TSR Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Description of performance goal |  | The performance share awards are divided into two independent parts that are subject to two separate performance metrics: 85% with a TSR (total shareholder return) goal and 15% with an internal NVA (“National Oilwell Varco Value Added”) (return on capital metric) goal. Performance against the TSR goal is determined by comparing the performance of the Company’s TSR with the TSR performance of the members of the OSX index for the three-year performance period. The TSR portion of the performance share awards is subject to vesting cap equal to 100% of Target Level if the Company’s absolute TSR is negative, regardless of relative TSR results. Conversely, if the Company’s absolute TSR is greater than 15% annualized over the three-year performance period the payout amount shall not be less than 50% of Target Level, regardless of relative TSR results. The NVA goal is based on the Company’s improvement in NVA from the beginning of the performance period until the end of the performance period. NVA shall be calculated as an amount equal to the Company’s (a) gross cash earnings less (b) average gross operating assets times an amount equal to a required return on assets. |
TSR [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of performance shares awarded |  | 85.00% |
NVA [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of performance shares awarded |  | 15.00% |
Minimum [Member] | Senior Management Employees [Member] | Performance-base restricted stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 0 |  |
Maximum [Member] | Senior Management Employees [Member] | Performance-base restricted stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 1,063,274 |  |
2018 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized shares under stock based compensation |  | 20,200,000 |
Remaining shares available for future grants under the Plan |  | 1,348,877 |
Stock-based compensation expense | $ |  | $ 27 | $ 33

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