Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ 1,805	$ 5,381	$ 6,989	$ 4,783
Net change, Tax effect	(440)	(827)	(411)	(1,124)
Total other comprehensive income, after–tax	1,365	4,554	6,578	3,659
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	2,095	3,014	3,014	2,428
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	(506)	(730)	(729)	(587)
Net unrealized gains/(losses) arising during the period/Translation, After-tax	1,589	2,284	2,285	1,841
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	(105)	16	(14)	929
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	25	(3)	3	(224)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	(80)	13	(11)	705
Net change, Pre-tax	1,990	3,030	3,000	3,357
Net change, Tax effect	(481)	(733)	(726)	(811)
Total other comprehensive income, after–tax	1,509	2,297	2,274	2,546
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(242)	2,411	6,200	117
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	54	(109)	(224)	9
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(188)	2,302	5,976	126
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	232	(2,523)	(6,115)	(129)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(56)	610	1,484	32
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	176	(1,913)	(4,631)	(97)
Net change, Pre-tax	(10)	(112)	85	(12)
Net change, Tax effect	(2)	501	1,260	41
Total other comprehensive income, after–tax	(12)	389	1,345	29
Reclassification of net pre-tax losses	0	(1)	0	0
Reclassification of net pre-tax gains related to net investment hedges	0	36	0	46
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	49	(27)	76	(43)
Net change, Tax effect	(12)	7	(19)	10
Total other comprehensive income, after–tax	37	(20)	57	(33)
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(264)	2,313	2,745	(132)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	64	(559)	(663)	32
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(200)	1,754	2,082	(100)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Pre-tax	678	673	1,891	1,917
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, Tax effect	(164)	(162)	(456)	(463)
Reclassification adjustment for realized (gains)/losses included in net income/ Hedges, After-tax	514	511	1,435	1,454
Net change, Pre-tax	414	2,986	4,636	1,785
Net change, Tax effect	(100)	(721)	(1,119)	(431)
Total other comprehensive income, after–tax	314	2,265	3,517	1,354
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	7	(36)	(48)	(2)
Net change, Tax effect	(3)	8	8	(3)
Total other comprehensive income, after–tax	4	(28)	(40)	(5)
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	(645)	(460)	(760)	(302)
Net change, Tax effect	158	111	185	70
Total other comprehensive income, after–tax	$ (487)	$ (349)	$ (575)	$ (232)

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