Earnings Per Common Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Income		$ 382	$ 416	$ 1,063	$ 1,134
Weighted-average common shares outstanding (for basic calculation)		282.0	281.0	282.0	281.0
Effect of dilutive share-based employee compensation		3.0	5.0	3.0	5.0
Weighted-average common and dilutive potential common shares outstanding (for diluted calculation)		285.0	286.0	285.0	286.0
Basic EPS		$ 1.36	$ 1.48	$ 3.77	$ 4.03
Diluted EPS		$ 1.35	$ 1.46	$ 3.73	$ 3.97
Unexercised employee stock options and stock appreciation rights (in millions) excluded from the diluted EPS computation	[1]	1.7	1.7	1.8	1.7

[1] These unexercised employee stock appreciation rights (“SARs”), restricted stock units (“RSUs”), performance share units (“PSUs”) and stock options were not included in the computation of diluted EPS because to do so would have been antidilutive for the periods presented.