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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 22, 2021 Installment $ / shares shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted | 1,678,013 |  |
Stock options fair value | $ / shares | $ 5.75 |  |
Stock options exercise price | $ / shares | $ 15.00 |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 2,972,175 |  |
Restricted stock granted fair value | $ / shares | $ 15.00 |  |
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 2021 PSAs can be earned based on performance against two established goals over a three-year 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 |  | 85% with a TSR (total shareholder return) goal and 15% with an internal NVA (“NOV Value Added”, a return on capital metric) goal. |
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 | 1,434,000 |  |
2018 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Authorized shares under stock based compensation |  | 42,700,000 |
Remaining shares available for future grants under the Plan |  | 13,300,000 |
Stock-based compensation expense | $ |  | $ 20 | $ 27
Income tax benefit recognized | $ |  | $ 0 | $ 0

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