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Share-Based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Shares      
Outstanding at beginning of period (in shares) 810 852 852
Granted (in shares) 0 0 0
Exercised (in shares) 0 (23) 0
Expired or cancelled (in shares) (48) (19) 0
Outstanding at end of period (in shares) 762 810 852
Exercisable (in shares) 730 706 639
Wtd. Avg. Exercise Price Per Share      
Outstanding at beginning of period (in dollars per share) $ 90 $ 90 $ 90
Exercised (in dollars per share)   76  
Expired or cancelled (in dollars per share) 80 109  
Outstanding at end of period (in dollars per share) 91 90 90
Exercisable (in dollars per share) $ 91 $ 90 $ 90
Wtd. Avg. Remaining Contractual Term and Aggregate Intrinsic Value      
Outstanding (in years) 3 years 8 months 12 days 4 years 4 months 24 days 5 years 1 month 6 days
Exercisable (in years) 3 years 6 months 4 years 1 month 6 days 4 years 4 months 24 days
Outstanding $ 0 $ 1 $ 2
Exercisable $ 0 $ 1 $ 2