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Share-based Compensation and Incentive Plans (Summary of Share-Based Compensation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]      
Share-based compensation $ 12 $ 12 $ 12
Income tax benefit recognized in net income for share-based compensation 2 3 3
Incremental compensation cost $ 0 $ 1 $ 0