Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ 5,381	$ (3,214)	$ 4,783	$ 496
Net change, Tax effect	(827)	400	(1,124)	(259)
Total other comprehensive income/(loss), after–tax	4,554	(2,814)	3,659	237
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	3,014	(3,234)	2,428	(1,097)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(730)	775	(587)	264
Net unrealized gains/(losses) arising during the period/Translation, After-tax	2,284	(2,459)	1,841	(833)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	16	669	929	2,437
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(3)	(160)	(224)	(585)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	13	509	705	1,852
Net change, Pre-tax	3,030	(2,565)	3,357	1,340
Net change, Tax effect	(733)	615	(811)	(321)
Total other comprehensive income/(loss), after–tax	2,297	(1,950)	2,546	1,019
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	2,411	(1,608)	117	(509)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(109)	18	9	(13)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	2,302	(1,590)	126	(522)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	(2,523)	1,647	(129)	596
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	610	(397)	32	(147)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	(1,913)	1,250	(97)	449
Net change, Pre-tax	(112)	39	(12)	87
Net change, Tax effect	501	(379)	41	(160)
Total other comprehensive income/(loss), after–tax	389	(340)	29	(73)
Reclassification of net pre-tax gains (losses)	(1)	0	0	(4)
Reclassification of pre-tax gains (losses) related to net investment hedges	36	0	46	(38)
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(27)	(7)	(43)	(20)
Net change, Tax effect	7	2	10	5
Total other comprehensive income/(loss), after–tax	(20)	(5)	(33)	(15)
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	2,313	(1,209)	(132)	(1,761)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(559)	290	32	422
Net unrealized gains/(losses) arising during the period/Translation, After-tax	1,754	(919)	(100)	(1,339)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	673	443	1,917	1,391
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(162)	(107)	(463)	(334)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	511	336	1,454	1,057
Net change, Pre-tax	2,986	(766)	1,785	(370)
Net change, Tax effect	(721)	183	(431)	88
Total other comprehensive income/(loss), after–tax	2,265	(583)	1,354	(282)
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(36)	(26)	(2)	(105)
Net change, Tax effect	8	5	(3)	23
Total other comprehensive income/(loss), after–tax	(28)	(21)	(5)	(82)
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(460)	111	(302)	(436)
Net change, Tax effect	111	(26)	70	106
Total other comprehensive income/(loss), after–tax	$ (349)	$ 85	$ (232)	$ (330)

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