Accumulated Other Comprehensive Income/(Loss) - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 294,127
Net change	$ (4,802)	$ 1,529	(14,285)	$ (5,416)
Ending balance	286,143	286,386	286,143	286,386
Accumulated other comprehensive income/(loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(9,567)	1,041	(84)	7,986
Net change	(4,802)	1,529	(14,285)	(5,416)
Ending balance	(14,369)	2,570	(14,369)	2,570
Unrealized gains/(losses) on investment securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(4,813)	3,841	2,640	8,180
Net change	(4,031)	674	(11,484)	(3,665)
Ending balance	(8,844)	4,515	(8,844)	4,515
After-tax unamortized unrealized gains/(losses) related to transfer of AFS securities to HTM			(1,400)	3,000
Translation adjustments, net of hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(996)	(723)	(934)	(473)
Net change	(679)	64	(741)	(186)
Ending balance	(1,675)	(659)	(1,675)	(659)
Fair value hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(21)	(140)	(131)	(112)
Net change	51	(23)	161	(51)
Ending balance	30	(163)	30	(163)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,087)	134	(296)	2,383
Net change	(1,348)	591	(4,139)	(1,658)
Ending balance	(4,435)	725	(4,435)	725
Defined benefit pension and OPEB plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(143)	(1,064)	(210)	(1,132)
Net change	20	9	87	77
Ending balance	(123)	(1,055)	(123)	(1,055)
DVA on fair value option elected liabilities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(507)	(1,007)	(1,153)	(860)
Net change	1,185	214	1,831	67
Ending balance	$ 678	$ (793)	$ 678	$ (793)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount, after tax, of adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

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- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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