Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Gains/(losses) recorded in income
Derivatives	$ (352)	$ 1,540	$ 133	$ 1,855
Hedged items	737	(1,305)	628	(1,191)
Income statement impact	385	235	761	664
Income statement impact of excluded components
Amortization approach	(147)	(145)	(394)	(474)
Changes in fair value	318	259	708	620
OCI impact
Derivatives - Gains/(losses) recorded in OCI	(27)	(7)	(43)	(20)
Interest rate
Gains/(losses) recorded in income
Derivatives	353	620	831	1,641
Hedged items	(91)	(577)	(353)	(1,516)
Income statement impact	262	43	478	125
Income statement impact of excluded components
Amortization approach	0	0	0	0
Changes in fair value	195	61	428	75
OCI impact
Derivatives - Gains/(losses) recorded in OCI	0	0	0	0
Foreign exchange
Gains/(losses) recorded in income
Derivatives	(668)	(18)	(863)	394
Hedged items	744	71	1,044	(211)
Income statement impact	76	53	181	183
Income statement impact of excluded components
Amortization approach	(147)	(145)	(394)	(474)
Changes in fair value	76	53	181	183
OCI impact
Derivatives - Gains/(losses) recorded in OCI	(27)	(7)	(43)	(20)
Commodity
Gains/(losses) recorded in income
Derivatives	(37)	938	165	(180)
Hedged items	84	(799)	(63)	536
Income statement impact	47	139	102	356
Income statement impact of excluded components
Amortization approach	0	0	0	0
Changes in fair value	47	145	99	362
OCI impact
Derivatives - Gains/(losses) recorded in OCI	$ 0	$ 0	$ 0	$ 0