Stock-Based Incentive Compensation Plans (Compensation Expense By Award Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based compensation arrangement by share-based payment award [Line Items]
Compensation expense	$ 61	$ 51	$ 62
Recognized tax benefit	13	11	13
Stock Options [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Compensation expense	8	10	8
Performance Shares [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Compensation expense	18	5	17
RSUs [Member]
Share-based compensation arrangement by share-based payment award [Line Items]
Compensation expense	$ 35	$ 36	$ 37