Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share Reconciliation [Abstract]
Net income	$ 1,123	$ 975
Participating share-based awards — allocated income	(8)	(7)
Net income available to common shareholders -- basic	1,115	968
Net income available to common shareholders -- diluted	$ 1,115	$ 968
Weighted average shares outstanding, basic (in shares)	229.0	231.7
Weighted average effects of dilutive securities - stock options and performance shares (in shares)	3.0	2.7
Weighted average shares outstanding, diluted (in shares)	232.0	234.4
Net income per common share, basic (in dollars per share)	$ 4.87	$ 4.18
Net income per common share, diluted (in dollars per share)	$ 4.80	$ 4.13