Earnings per Share (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 Reconciliation [Abstract]
Net income	$ 2,842	$ 3,662	$ 2,697
Participating securities — allocated income	(20)	(27)	(19)
Net income available to common shareholders -- basic	2,822	3,635	2,678
Net income available to common shareholders -- diluted	$ 2,822	$ 3,635	$ 2,678
Weighted average shares outstanding, basic (in shares)	237.0	248.5	253.5
Weighted average effects of dilutive securities - stock options and performance shares (in shares)	2.7	2.3	1.1
Weighted average shares outstanding, diluted (in shares)	239.7	250.8	254.6
Net income per common share, basic (in dollars per share)	$ 11.91	$ 14.63	$ 10.56
Net income per common share, diluted (in dollars per share)	$ 11.77	$ 14.49	$ 10.52