Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Gains/(losses) recorded in income
Derivatives	$ 1,540	$ 1,009	$ 1,855	$ (13,748)
Hedged items	(1,305)	(1,091)	(1,191)	13,386
Income statement impact	235	(82)	664	(362)
Income statement impact of excluded components
Amortization approach	(145)	(170)	(474)	(350)
Changes in fair value	259	(28)	620	(273)
OCI impact
Derivatives - Gains/(losses) recorded in OCI	(7)	50	(20)	262
Interest rate
Gains/(losses) recorded in income
Derivatives	620	(2,947)	1,641	(14,484)
Hedged items	(577)	2,819	(1,516)	14,167
Income statement impact	43	(128)	125	(317)
Income statement impact of excluded components
Amortization approach	0	0	0	0
Changes in fair value	61	(93)	75	(238)
OCI impact
Derivatives - Gains/(losses) recorded in OCI	0	0	0	0
Foreign exchange
Gains/(losses) recorded in income
Derivatives	(18)	(1,044)	394	(2,552)
Hedged items	71	1,082	(211)	2,600
Income statement impact	53	38	183	48
Income statement impact of excluded components
Amortization approach	(145)	(170)	(474)	(350)
Changes in fair value	53	39	183	49
OCI impact
Derivatives - Gains/(losses) recorded in OCI	(7)	50	(20)	262
Commodity
Gains/(losses) recorded in income
Derivatives	938	5,000	(180)	3,288
Hedged items	(799)	(4,992)	536	(3,381)
Income statement impact	139	8	356	(93)
Income statement impact of excluded components
Amortization approach	0	0	0	0
Changes in fair value	145	26	362	(84)
OCI impact
Derivatives - Gains/(losses) recorded in OCI	$ 0	$ 0	$ 0	$ 0