Earnings Per Common Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Income		$ 1,325	$ 1,575	$ 904
Weighted-average common shares outstanding (for basic calculation) (in shares)		286.0	297.0	302.0
Effect of dilutive share-based employee compensation (in shares)		4.0	5.0	5.0
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation) (in shares)		290.0	302.0	307.0
Basic EPS (in dollars per share)		$ 4.63	$ 5.30	$ 2.99
Diluted EPS (in dollars per share)		$ 4.57	$ 5.21	$ 2.94
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation (in shares)	[1]	1.9	1.1	4.8

[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.