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Stock-Based Compensation - Stock Appreciation Rights, Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Stock Ownership Plan (ESOP) Disclosures      
Stock-based compensation expense $ 120 $ 123 $ 132
SARs      
Employee Stock Ownership Plan (ESOP) Disclosures      
Weighted-average grant-date fair value per share (in dollars per share) $ 7.84 $ 6.82 $ 7.38
Total grant-date fair value $ 8 $ 15 $ 20
Stock-based compensation expense $ 1    
Weighted-average period over which expense is expected to be recognized 1 year 9 months 18 days