Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common stock [Member]	Retained earnings [Member]	Accumulated other comprehensive income (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		102
Compensation amortization under share-based plans and other changes		164
Net income	$ 1,365		1,365
Dividends			(683)
Other			0
Other comprehensive income (loss)	(1,567)			(1,567)
Treasury stock acquired — share repurchase authorizations					(900)
Net shares acquired related to employee share-based compensation plans					(63)
Balance, end of period at Sep. 30, 2023	19,978	24,831	44,198	(8,012)	(41,039)
Balance, beginning of period (in shares) at Dec. 31, 2022						232.1
Common shares outstanding
Treasury stock acquired — share repurchase authorizations (in shares)						(5.0)
Net shares issued under employee share-based compensation plans (in shares)						1.3
Balance, end of period (in shares) at Sep. 30, 2023						228.4
Balance, beginning of period at Jun. 30, 2023		24,776	44,026	(6,009)	(40,938)
Shareholders' Equity [Roll Forward]
Employee share-based compensation		8
Compensation amortization under share-based plans and other changes		47
Net income	404		404
Dividends			(232)
Other			0
Other comprehensive income (loss)	(2,003)			(2,003)
Treasury stock acquired — share repurchase authorizations					(100)
Net shares acquired related to employee share-based compensation plans					(1)
Balance, end of period at Sep. 30, 2023	19,978	24,831	44,198	(8,012)	(41,039)
Balance, beginning of period (in shares) at Jun. 30, 2023						228.9
Common shares outstanding
Treasury stock acquired — share repurchase authorizations (in shares)						(0.6)
Net shares issued under employee share-based compensation plans (in shares)						0.1
Balance, end of period (in shares) at Sep. 30, 2023						228.4
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		231
Compensation amortization under share-based plans and other changes		202
Net income	2,917		2,917
Dividends			(720)
Other			1
Other comprehensive income (loss)	1,038			1,038
Treasury stock acquired — share repurchase authorizations	(750)				(750)
Net shares acquired related to employee share-based compensation plans	(144)				(144)
Balance, end of period at Sep. 30, 2024	$ 27,696	25,339	47,789	(3,433)	(41,999)
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)	(3.4)					(3.4)
Net shares issued under employee share-based compensation plans (in shares)						2.2
Balance, end of period (in shares) at Sep. 30, 2024	227.0					227.0
Balance, beginning of period at Jun. 30, 2024		25,245	46,773	(5,410)	(41,746)
Shareholders' Equity [Roll Forward]
Employee share-based compensation		31
Compensation amortization under share-based plans and other changes		63
Net income	$ 1,260		1,260
Dividends			(243)
Other			(1)
Other comprehensive income (loss)	1,977			1,977
Treasury stock acquired — share repurchase authorizations	(250)				(250)
Net shares acquired related to employee share-based compensation plans	(3)				(3)
Balance, end of period at Sep. 30, 2024	$ 27,696	$ 25,339	$ 47,789	$ (3,433)	$ (41,999)
Balance, beginning of period (in shares) at Jun. 30, 2024						227.9
Common shares outstanding
Treasury stock acquired — share repurchase authorizations (in shares)	(1.1)					(1.1)
Net shares issued under employee share-based compensation plans (in shares)						0.2
Balance, end of period (in shares) at Sep. 30, 2024	227.0					227.0