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Stock Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Employee service share based compensation aggregate disclosures [Abstract] |  |  |
Share based compensation cost | $ 58 | $ 17 | $ 55
Total unrecognized compensation cost related to share-based compensation arrangements | $ 36 |  |
Weighted average period of time over which unrecognized compensation cost is to be recognized (in years) | 1 year 8 months 12 days |  |
Minimum employee service period (in years) | 10 years |  |
Age and number of years of service | 65 years |  |
The remaining number of RSU's or stock options that may be issued (in shares) | 22,000,000 |  |
Employee stock purchase plan [Abstract] |  |  |
The remaining balance of shares originally authorized for issue under the employee stock purchase plan (in shares) | 5,000,000 |  |
The percentage of market value at which shares may be issued to participating employees (as a percent) | 90.00% |  |
The discount percentage off the market value for the employee stock purchase plan (in hundredths) | 10.00% |  |
Performance Shares |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |
Vesting percentage (as a percent) | 50.00% |  |
Termination period (in months) | 12 months |  |
Performance Shares | Minimum |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |
Percentage of PBRSUs to be granted | 10.00% | 0.00% |
Performance Shares | Maximum |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |
Percentage of PBRSUs to be granted | 300.00% | 200.00% |
Restricted stock units |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |
Vesting periods for plans (in years) |  | 3 years |
The remaining number of RSU's or stock options that may be issued (in shares) | 17,000,000 |  |
Stock Compensation Plan - Board of Directors |  |  |
Employee service share based compensation aggregate disclosures [Abstract] |  |  |
Non-option equity instruments granted (in shares) | 27,000 | 54,000 | 31,000
Weighted average price of non-option equity instruments granted (in USD per share) | $ 60.39 | $ 29.60 | $ 52.01

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