Earnings Per Common Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Net Income		$ 399	$ 326
Weighted-average common shares outstanding (for basic calculation)		289.0	301.0
Effect of dilutive share-based employee compensation		5.0	4.0
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation)		294.0	305.0
Basic EPS		$ 1.38	$ 1.09
Diluted EPS		$ 1.36	$ 1.07
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation	[1]	1.2	2.3

[1] These unexercised employee stock options and stock appreciation rights were not included in the computation of diluted EPS because to do so would have been antidilutive for the periods presented.