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
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	$ 58	$ 48	$ 59
Recognized tax benefit	12	10	12
Stock Options [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	8	9	8
Performance Shares [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	17	5	16
RSU's [Member]
Employee service share-based compensation, aggregate disclosures [Abstract]
Compensation expense	$ 33	$ 34	$ 35