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Stock-Based Incentive Compensation Plans (Compensation Expense By Award Type) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based compensation arrangement by share-based payment award [Line Items]      
Compensation expense $ 51 $ 62 $ 52
Recognized tax benefit 11 13 11
Stock Options [Member]      
Share-based compensation arrangement by share-based payment award [Line Items]      
Compensation expense 10 8 5
Performance Shares [Member]      
Share-based compensation arrangement by share-based payment award [Line Items]      
Compensation expense 5 17 15
RSUs [Member]      
Share-based compensation arrangement by share-based payment award [Line Items]      
Compensation expense $ 36 $ 37 $ 32