Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share Reconciliation [Abstract]
Net income	$ 975	$ 1,018
Participating share-based awards — allocated income	(7)	(7)
Net income available to common shareholders -- basic	968	1,011
Net income available to common shareholders -- diluted	$ 968	$ 1,011
Weighted average shares outstanding, basic (in shares)	231.7	240.9
Weighted average effects of dilutive securities - stock options and performance shares (in shares)	2.7	2.8
Weighted average shares outstanding, diluted (in shares)	234.4	243.7
Net income per common share, basic (in dollars per share)	$ 4.18	$ 4.20
Net income per common share, diluted (in dollars per share)	$ 4.13	$ 4.15