Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	$ (5,445)	$ 1,917	$ (17,835)	$ (6,884)
Net change, Tax effect	643	(388)	3,550	1,468
Total other comprehensive income/(loss), after–tax	(4,802)	1,529	(14,285)	(5,416)
Unrealized gains/(losses) on investment securities
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(5,456)	727	(15,658)	(4,966)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	1,308	(171)	3,758	1,194
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(4,148)	556	(11,900)	(3,772)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	153	155	547	141
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	(36)	(37)	(131)	(34)
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	117	118	416	107
Net change, Pre-tax	(5,303)	882	(15,111)	(4,825)
Net change, Tax effect	1,272	(208)	3,627	1,160
Total other comprehensive income/(loss), after–tax	(4,031)	674	(11,484)	(3,665)
Translation adjustments
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(3,550)	280	(3,891)	(920)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	193	(10)	217	29
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(3,357)	270	(3,674)	(891)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	3,524	(270)	3,862	930
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	(846)	64	(929)	(225)
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	2,678	(206)	2,933	705
Net change, Pre-tax	(26)	10	(29)	10
Net change, Tax effect	(653)	54	(712)	(196)
Total other comprehensive income/(loss), after–tax	(679)	64	(741)	(186)
Fair value hedges, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	67	(31)	212	(68)
Net change, Tax effect	(16)	8	(51)	17
Total other comprehensive income/(loss), after–tax	51	(23)	161	(51)
Cash flow hedges
Unrealized gains/(losses) on investment securities:
Net unrealized gains/(losses) arising during the period/Translation, Pre-tax	(1,750)	1,118	(5,186)	(1,577)
Net unrealized gains/(losses) arising during the period/Translation, Tax effect	420	(269)	1,245	378
Net unrealized gains/(losses) arising during the period/Translation, After-tax	(1,330)	849	(3,941)	(1,199)
Reclassification adjustment for realized (gains)/losses included in net income, Pre-tax	(24)	(340)	(261)	(604)
Reclassification adjustment for realized (gains)/losses included in net income, Tax effect	6	82	63	145
Reclassification adjustment for realized (gains)/losses included in net income, After-tax	(18)	(258)	(198)	(459)
Net change, Pre-tax	(1,774)	778	(5,447)	(2,181)
Net change, Tax effect	426	(187)	1,308	523
Total other comprehensive income/(loss), after–tax	(1,348)	591	(4,139)	(1,658)
Defined benefit pension and OPEB plans, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	33	2	123	93
Net change, Tax effect	(13)	7	(36)	(16)
Total other comprehensive income/(loss), after–tax	20	9	87	77
DVA on fair value option elected liabilities, net change
Unrealized gains/(losses) on investment securities:
Net change, Pre-tax	1,558	276	2,417	87
Net change, Tax effect	(373)	(62)	(586)	(20)
Total other comprehensive income/(loss), after–tax	$ 1,185	$ 214	$ 1,831	$ 67

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