Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Shareholders' net income	$ 1,408	$ 2,757	[1]	$ 4,135	$ 5,511	[1]
Shares:
Weighted average (in shares)	294,058	303,854		294,752	312,434
Common stock equivalents (in shares)	3,073	3,663		2,911	3,213
Total shares (in shares)	297,131	307,517		297,663	315,647
EPS, basic (in dollars per share)	$ 4.79	$ 9.07	[1]	$ 14.03	$ 17.64	[1]
EPS, effect of dilution (in dollars per share)	(0.05)	(0.10)		(0.14)	(0.18)
EPS, diluted (in dollars per share)	$ 4.74	$ 8.97	[1]	$ 13.89	$ 17.46	[1]

[1] Amounts have been restated to reflect the adoption of Targeted Improvements to the Accounting for Long-Duration Contracts in 2023. See Note 2 to the Consolidated Financial Statements for further information.