Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common stock [Member]	Retained earnings [Member]	Accumulated other comprehensive loss, net of tax [Member]	Treasury stock, at cost [Member]	Common shares outstanding [Member]
Balance, beginning of period at Dec. 31, 2022		$ 24,565	$ 43,516	$ (6,445)	$ (40,076)
Shareholders' Equity [Roll Forward]
Employee share-based compensation		68
Compensation amortization under share-based plans and other changes		70
Net income	$ 975		975
Dividends			(218)
Other			0
Other comprehensive income (loss)	1,059			1,059
Treasury stock acquired — share repurchase authorizations					(400)
Net shares acquired related to employee share-based compensation plans					(62)
Balance, end of period at Mar. 31, 2023	23,052	24,703	44,273	(5,386)	(40,538)
Balance, beginning of period (in shares) at Dec. 31, 2022						232.1
Common shares outstanding
Treasury stock acquired — share repurchase authorizations (in shares)						(2.2)
Net shares issued under employee share-based compensation plans (in shares)						1.1
Balance, end of period (in shares) at Mar. 31, 2023						231.0
Balance, beginning of period at Dec. 31, 2023	24,921	24,906	45,591	(4,471)	(41,105)
Shareholders' Equity [Roll Forward]
Employee share-based compensation		179
Compensation amortization under share-based plans and other changes		78
Net income	1,123		1,123
Dividends			(232)
Other			1
Other comprehensive income (loss)	(660)			(660)
Treasury stock acquired — share repurchase authorizations	(250)				(250)
Net shares acquired related to employee share-based compensation plans	(138)				(138)
Balance, end of period at Mar. 31, 2024	$ 25,022	$ 25,163	$ 46,483	$ (5,131)	$ (41,493)
Balance, beginning of period (in shares) at Dec. 31, 2023	228.2					228.2
Common shares outstanding
Treasury stock acquired — share repurchase authorizations (in shares)	(1.2)					(1.2)
Net shares issued under employee share-based compensation plans (in shares)						2.0
Balance, end of period (in shares) at Mar. 31, 2024	229.0					229.0