Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Gains/(losses) recorded in income
Derivatives	$ (234)	$ (352)	$ (914)	$ 133
Hedged items	709	737	2,291	628
Income statement impact	475	385	1,377	761
Income statement impact of excluded components
Amortization approach	(208)	(147)	(509)	(394)
Changes in fair value	469	318	1,287	708
OCI impact
Derivatives - Gains/(losses) recorded in OCI	49	(27)	76	(43)
Interest rate
Gains/(losses) recorded in income
Derivatives	(43)	353	36	831
Hedged items	359	(91)	923	(353)
Income statement impact	316	262	959	478
Income statement impact of excluded components
Amortization approach	0	0	0	0
Changes in fair value	318	195	914	428
OCI impact
Derivatives - Gains/(losses) recorded in OCI	0	0	0	0
Foreign exchange
Gains/(losses) recorded in income
Derivatives	413	(668)	930	(863)
Hedged items	(301)	744	(693)	1,044
Income statement impact	112	76	237	181
Income statement impact of excluded components
Amortization approach	(208)	(147)	(509)	(394)
Changes in fair value	112	76	237	181
OCI impact
Derivatives - Gains/(losses) recorded in OCI	49	(27)	76	(43)
Commodity
Gains/(losses) recorded in income
Derivatives	(604)	(37)	(1,880)	165
Hedged items	651	84	2,061	(63)
Income statement impact	47	47	181	102
Income statement impact of excluded components
Amortization approach	0	0	0	0
Changes in fair value	39	47	136	99
OCI impact
Derivatives - Gains/(losses) recorded in OCI	$ 0	$ 0	$ 0	$ 0