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Common Stock - Additional Information (Detail)
 12 Months Ended
May 30, 2024
$ / shares
shares
May 15, 2024
$ / shares
shares
May 13, 2024
$ / shares
shares
Feb. 06, 2024
$ / shares
shares
Dec. 20, 2017
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
Installment
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of common stock, authorized | shares           1,000,000,000 1,000,000,000  
Number of preferred stock, authorized | shares           10,000,000    
Common stock, par value | $ / shares           $ 0.01 $ 0.01  
Preferred stock, par value | $ / shares           $ 0.01    
Preferred stock, shares issued | shares           0    
Preferred stock, shares outstanding | shares           0    
Aggregated cash dividends paid | $           $ 108,000,000 $ 79,000,000 $ 78,000,000
Stock-based compensation expense | $           70,000,000 66,000,000 67,000,000
Income tax provision recognized | $           $ 2,000,000 $ 7,000,000 $ 3,000,000
Earlier authorized shares under stock based compensation | shares | shares           69,400,000    
Duration of performance-based restricted stock awards, vested           Options granted under our stock-based compensation plans generally vest over a three-year period starting one year from the date of grant and expire ten years from the date of grant.    
Weighted average grant-date fair value of options | $ / shares           $ 7.9 $ 9.75 $ 6.28
Total intrinsic value of options exercised | $           $ 1,000,000 $ 1,000,000  
Stock option, Minimum Range | $ / shares           $ 15.00    
Stock option, Maximum Range | $ / shares           $ 54.74    
Weighted-average remaining contractual term for outstanding stock options           3 years 4 months 28 days    
Weighted-average remaining contractual term for exercisable stock options           2 years 8 months 19 days    
Aggregate intrinsic value of outstanding options | $           $ 0    
Total unrecognized compensation cost related to nonvested stock options | $           $ 9,000,000    
Compensation cost not yet recognized, period for recognition           3 years    
Total fair value of stock options vested | $           $ 9,000,000 9,000,000 $ 10,000,000
Cash received from option exercises | $           3,000,000 4,000,000 2,000,000
Actual tax benefit (expense) from share based compensation | $           0 $ 0 $ 0
Cash payment of stock appreciation rights | $           $ 229,000,000    
Stock options granted | shares           1,110,478 1,014,002 1,492,020
Weighted average exercise price per share of options | $ / shares           $ 17.52 $ 21.76 $ 16.73
Stock Appreciation Rights (SARs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock appreciation rights exchange percentage         94.75%      
Cash payment of stock appreciation rights | $         $ 14,000,000      
Cash paid to settle SARs | $           $ 0    
Compensation cost recognized | $           $ 0 $ 0 $ 0
Employee Stock Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average grant-date fair value of options | $ / shares         $ 8.47      
Stock options granted | shares         3,613,707      
Weighted average exercise price per share of options | $ / shares         $ 34.32      
Restricted Stock and Restricted Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Duration of performance-based restricted stock awards, vested           The restricted stock units vest in three equal annual installments commencing on the first anniversary of the grant date.    
Shares granted | shares       2,571,356   3,204,434 2,792,465 3,509,425
Restricted stock granted fair value | $ / shares       $ 17.52   $ 17.96 $ 22.70 $ 17.67
Number of equal annual vesting installments | Installment           3    
Performance-base restricted stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Description of performance goal           The 2024 PSAs can be earned based on performance against two established goals over a three-year period    
Performance-base restricted stock [Member] | Senior Management Employees [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares granted | shares       0        
Performance-base restricted stock [Member] | Senior Management Employees [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares granted | shares       1,061,644        
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 performance is determined by comparing the Company’s TSR with the TSR of the members of the Philadelphia Stock Exchange’s Oil Services Sector Index (OSX) for the three-year performance period. The TSR portion of the performance share awards is subject to a 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 is 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, with certain adjustments.    
Restricted Stock Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total unrecognized compensation cost related to nonvested stock options | $           $ 64,000,000    
Compensation cost not yet recognized, period for recognition           2 years    
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%    
2018 Plan [Member] | Employee Stock Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average grant-date fair value of options | $ / shares       $ 7.9        
Stock options granted | shares       1,110,478        
Weighted average exercise price per share of options | $ / shares       $ 17.52        
2018 Plan [Member] | Restricted Stock Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares granted | shares 13,639 85,950 2,667          
Restricted stock granted fair value | $ / shares $ 18.33 $ 18.85 $ 18.76          
NOV Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized shares under stock based compensation | shares           55,700,000    
Remaining shares available for future grants under the Plan | shares           7,800,000