Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net derivative receivables:
Beginning balance	$ (2,981)	$ (1,852)	$ 673
Total realized/unrealized gains/(losses)	4,331	528	1,023
Purchases	1,564	1,499	1,329
Sales	(3,674)	(3,455)	(2,645)
Settlements	(2,436)	292	(843)
Transfers into level 3	(70)	(181)	(269)
Transfers (out of) level 3	189	188	(1,120)
Ending balance	(3,077)	(2,981)	(1,852)
Change in unrealized gains/(losses) related to financial instruments held	$ 2,026	$ 611	$ (221)
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Principal Transactions Revenue, Net	Principal Transactions Revenue, Net	Principal Transactions Revenue, Net
Level 3 Rollforward Supplemental Data [Abstract]
Level 3 assets as a percentage of total firm assets at fair value	1.00%	2.00%	2.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value	9.00%	9.00%	8.00%
Deposits
Liabilities:
Beginning balance	$ 2,185	$ 1,833	$ 2,162
Total realized/unrealized (gains)/losses	161	(14)	95
Purchases	0	0	0
Sales	0	0	0
Issuances	1,951	2,006	940
Settlements	(1,811)	(1,522)	(1,043)
Transfers into level 3	0	34	0
Transfers (out of) level 3	(130)	(152)	(321)
Ending balance	2,356	2,185	1,833
Change in unrealized (gains)/losses related to financials instruments held	128	(44)	73
Short-term borrowings
Liabilities:
Beginning balance	3,476	1,758	1,401
Total realized/unrealized (gains)/losses	536	180	201
Purchases	0	0	0
Sales	0	0	0
Issuances	10,307	7,752	4,522
Settlements	(8,672)	(6,230)	(4,345)
Transfers into level 3	36	23	3
Transfers (out of) level 3	(125)	(7)	(24)
Ending balance	5,558	3,476	1,758
Change in unrealized (gains)/losses related to financials instruments held	392	58	14
Total debt and equity instruments
Liabilities:
Beginning balance	46	37	84
Total realized/unrealized (gains)/losses	(14)	(47)	(21)
Purchases	(86)	(45)	(32)
Sales	109	70	9
Issuances	0	0	0
Settlements	0	0	(2)
Transfers into level 3	326	48	19
Transfers (out of) level 3	(55)	(17)	(20)
Ending balance	326	46	37
Change in unrealized (gains)/losses related to financials instruments held	302	18	0
Accounts payable and other liabilities
Liabilities:
Beginning balance	76	52	53
Total realized/unrealized (gains)/losses	(6)	(6)	(4)
Purchases	(1)	(35)	(16)
Sales	1	63	24
Issuances	0	0	0
Settlements	0	0	0
Transfers into level 3	2	5	8
Transfers (out of) level 3	(34)	(3)	(13)
Ending balance	38	76	52
Change in unrealized (gains)/losses related to financials instruments held	(6)	(6)	(4)
Long-term debt
Liabilities:
Beginning balance	34,564	27,726	24,092
Total realized/unrealized (gains)/losses	5,039	1,475	3,010
Purchases	0	0	0
Sales	0	0	0
Issuances	31,966	23,920	12,679
Settlements	(22,573)	(18,432)	(11,555)
Transfers into level 3	593	738	229
Transfers (out of) level 3	(2,916)	(863)	(729)
Ending balance	46,673	34,564	27,726
Change in unrealized (gains)/losses related to financials instruments held	3,898	1,212	2,870
DVA for fair value option elected liabilities
Level 3 Rollforward Supplemental Data [Abstract]
Unrealized (gains)/losses on liabilities recorded in OCI	235	(50)	(158)
Interest rate
Net derivative receivables:
Beginning balance	301	502	701
Total realized/unrealized gains/(losses)	1,329	745	556
Purchases	188	387	251
Sales	(338)	(197)	(255)
Settlements	108	(608)	654
Transfers into level 3	(168)	(172)	(1,117)
Transfers (out of) level 3	(114)	(356)	(288)
Ending balance	1,306	301	502
Change in unrealized gains/(losses) related to financial instruments held	790	(362)	419
Credit
Net derivative receivables:
Beginning balance	(363)	265	13
Total realized/unrealized gains/(losses)	(637)	(208)	304
Purchases	94	(2)	(60)
Sales	(10)	(17)	(25)
Settlements	10	(333)	47
Transfers into level 3	(273)	(61)	15
Transfers (out of) level 3	44	(7)	(29)
Ending balance	(1,135)	(363)	265
Change in unrealized gains/(losses) related to financial instruments held	(569)	(265)	230
Foreign exchange
Net derivative receivables:
Beginning balance	20	62	489
Total realized/unrealized gains/(losses)	644	248	31
Purchases	196	178	151
Sales	(448)	(538)	(144)
Settlements	(34)	(30)	(187)
Transfers into level 3	273	128	144
Transfers (out of) level 3	(346)	(28)	(422)
Ending balance	305	20	62
Change in unrealized gains/(losses) related to financial instruments held	221	353	(80)
Equity
Net derivative receivables:
Beginning balance	(2,866)	(2,402)	(384)
Total realized/unrealized gains/(losses)	2,941	(321)	191
Purchases	1,016	904	928
Sales	(2,630)	(2,488)	(1,931)
Settlements	(2,690)	953	(1,306)
Transfers into level 3	83	(91)	700
Transfers (out of) level 3	609	579	(600)
Ending balance	(3,537)	(2,866)	(2,402)
Change in unrealized gains/(losses) related to financial instruments held	1,476	783	(646)
Commodity
Net derivative receivables:
Beginning balance	(73)	(279)	(146)
Total realized/unrealized gains/(losses)	54	64	(59)
Purchases	70	32	59
Sales	(248)	(215)	(290)
Settlements	170	310	(51)
Transfers into level 3	15	15	(11)
Transfers (out of) level 3	(4)	0	219
Ending balance	(16)	(73)	(279)
Change in unrealized gains/(losses) related to financial instruments held	108	102	(144)
Total mortgage-backed securities
Assets:
Fair value, beginning balance	503	775	771
Total realized/unrealized gains/(losses)	16	23	16
Purchases	34	46	249
Sales	(181)	(265)	(139)
Settlements	(56)	(83)	(109)
Transfers into level 3	0	11	9
Transfers (out of) level 3	(4)	(4)	(22)
Fair value, ending balance	312	503	775
Change in unrealized gains/(losses) related to financial instruments held	4	(4)	9
Mortgage-backed securities, U.S. GSEs and government agencies
Assets:
Fair value, beginning balance	488	758	759
Total realized/unrealized gains/(losses)	16	18	4
Purchases	34	46	249
Sales	(175)	(260)	(133)
Settlements	(56)	(81)	(107)
Transfers into level 3	0	7	0
Transfers (out of) level 3	0	0	(14)
Fair value, ending balance	307	488	758
Change in unrealized gains/(losses) related to financial instruments held	4	(3)	1
Mortgage-backed securities, Residential - nonagency
Assets:
Fair value, beginning balance	5	5	5
Total realized/unrealized gains/(losses)	6	7	6
Purchases	0	0	0
Sales	(6)	(5)	(6)
Settlements	0	(2)	(1)
Transfers into level 3	0	4	1
Transfers (out of) level 3	0	(4)	0
Fair value, ending balance	5	5	5
Change in unrealized gains/(losses) related to financial instruments held	0	0	1
Mortgage-backed securities, Commercial - nonagency
Assets:
Fair value, beginning balance	10	12	7
Total realized/unrealized gains/(losses)	(6)	(2)	6
Purchases	0	0	0
Sales	0	0	0
Settlements	0	0	(1)
Transfers into level 3	0	0	8
Transfers (out of) level 3	(4)	0	(8)
Fair value, ending balance	0	10	12
Change in unrealized gains/(losses) related to financial instruments held	0	(1)	7
Total debt and equity instruments
Assets:
Fair value, beginning balance	2,442	2,373	2,909
Total realized/unrealized gains/(losses)	(13)	256	0
Purchases	2,666	1,683	2,135
Sales	(1,871)	(1,572)	(1,315)
Settlements	(310)	(419)	(984)
Transfers into level 3	1,181	1,001	728
Transfers (out of) level 3	(1,301)	(880)	(1,100)
Fair value, ending balance	2,794	2,442	2,373
Change in unrealized gains/(losses) related to financial instruments held	191	(124)	(302)
Total debt instruments
Assets:
Fair value, beginning balance	2,144	2,138	2,178
Total realized/unrealized gains/(losses)	16	116	111
Purchases	2,091	1,489	1,823
Sales	(1,642)	(1,449)	(1,076)
Settlements	(212)	(349)	(593)
Transfers into level 3	957	888	535
Transfers (out of) level 3	(1,172)	(689)	(840)
Fair value, ending balance	2,182	2,144	2,138
Change in unrealized gains/(losses) related to financial instruments held	(17)	60	148
Obligations of U.S. states and municipalities
Assets:
Fair value, beginning balance	1	10	7
Total realized/unrealized gains/(losses)	0	0	0
Purchases	0	0	1
Sales	0	0	0
Settlements	0	(3)	(1)
Transfers into level 3	0	0	3
Transfers (out of) level 3	0	(6)	0
Fair value, ending balance	1	1	10
Change in unrealized gains/(losses) related to financial instruments held	0	0	0
Non-U.S. government debt securities
Assets:
Fair value, beginning balance	152	179	155
Total realized/unrealized gains/(losses)	30	(6)	74
Purchases	346	175	217
Sales	(308)	(183)	(254)
Settlements	0	0	0
Transfers into level 3	59	17	22
Transfers (out of) level 3	(34)	(30)	(35)
Fair value, ending balance	245	152	179
Change in unrealized gains/(losses) related to financial instruments held	19	(10)	74
Corporate debt securities
Assets:
Fair value, beginning balance	390	484	463
Total realized/unrealized gains/(losses)	28	36	36
Purchases	270	459	322
Sales	(212)	(354)	(172)
Settlements	(10)	(181)	(41)
Transfers into level 3	22	13	114
Transfers (out of) level 3	(34)	(67)	(238)
Fair value, ending balance	454	390	484
Change in unrealized gains/(losses) related to financial instruments held	23	45	35
Loans
Assets:
Fair value, beginning balance	1,088	684	759
Total realized/unrealized gains/(losses)	(58)	63	(15)
Purchases	1,413	800	1,027
Sales	(930)	(642)	(499)
Settlements	(146)	(74)	(441)
Transfers into level 3	876	839	382
Transfers (out of) level 3	(1,100)	(582)	(529)
Fair value, ending balance	1,143	1,088	684
Change in unrealized gains/(losses) related to financial instruments held	(63)	29	30
Asset-backed securities
Assets:
Fair value, beginning balance	10	6	23
Total realized/unrealized gains/(losses)	0	0	0
Purchases	28	9	7
Sales	(11)	(5)	(12)
Settlements	0	(8)	(1)
Transfers into level 3	0	8	5
Transfers (out of) level 3	0	0	(16)
Fair value, ending balance	27	10	6
Change in unrealized gains/(losses) related to financial instruments held	0	0	0
Equity securities
Assets:
Fair value, beginning balance	62	127	665
Total realized/unrealized gains/(losses)	(34)	(21)	(53)
Purchases	264	138	164
Sales	(229)	(123)	(239)
Settlements	0	(1)	(384)
Transfers into level 3	165	85	192
Transfers (out of) level 3	(90)	(143)	(218)
Fair value, ending balance	138	62	127
Change in unrealized gains/(losses) related to financial instruments held	0	(308)	(422)
Physical commodities
Assets:
Fair value, beginning balance	26	7	2
Total realized/unrealized gains/(losses)	3	17	0
Purchases	0	3	7
Sales	0	0	0
Settlements	1	(1)	(2)
Transfers into level 3	0	0	0
Transfers (out of) level 3	0	0	0
Fair value, ending balance	30	26	7
Change in unrealized gains/(losses) related to financial instruments held	16	16	0
Other
Assets:
Fair value, beginning balance	210	101	64
Total realized/unrealized gains/(losses)	2	144	(58)
Purchases	311	53	141
Sales	0	0	0
Settlements	(99)	(68)	(5)
Transfers into level 3	59	28	1
Transfers (out of) level 3	(39)	(48)	(42)
Fair value, ending balance	444	210	101
Change in unrealized gains/(losses) related to financial instruments held	192	108	(28)
Total available-for-sale securities
Assets:
Fair value, beginning balance	8	0	239
Total realized/unrealized gains/(losses)	(3)	0	24
Purchases	194	0	0
Sales	(94)	0	(225)
Settlements	0	0	0
Transfers into level 3	6	8	0
Transfers (out of) level 3	0	0	(38)
Fair value, ending balance	111	8	0
Change in unrealized gains/(losses) related to financial instruments held	(1)	0	0
Commercial – nonagency
Assets:
Fair value, beginning balance	8	0	0
Total realized/unrealized gains/(losses)	(5)	0	0
Purchases	0	0	0
Sales	0	0	0
Settlements	0	0	0
Transfers into level 3	0	8	0
Transfers (out of) level 3	0	0	0
Fair value, ending balance	3	8	0
Change in unrealized gains/(losses) related to financial instruments held	(5)	0	0
Corporate debt securities
Assets:
Fair value, beginning balance	0	0	239
Total realized/unrealized gains/(losses)	2	0	24
Purchases	194	0	0
Sales	(94)	0	(225)
Settlements	0	0	0
Transfers into level 3	6	0	0
Transfers (out of) level 3	0	0	(38)
Fair value, ending balance	108	0	0
Change in unrealized gains/(losses) related to financial instruments held	4	0	0
Loans
Assets:
Fair value, beginning balance	2,416	3,079	1,418
Total realized/unrealized gains/(losses)	206	266	289
Purchases	1,091	431	2,398
Sales	(226)	(756)	(120)
Settlements	(968)	(993)	(1,147)
Transfers into level 3	1,266	816	1,306
Transfers (out of) level 3	(723)	(427)	(1,065)
Fair value, ending balance	3,062	2,416	3,079
Change in unrealized gains/(losses) related to financial instruments held	165	251	293
Mortgage servicing rights
Assets:
Fair value, beginning balance	9,121	8,522	7,973
Total realized/unrealized gains/(losses)	48	762	467
Purchases	1,057	926	1,281
Sales	9	(21)	(188)
Settlements	(1,068)	(1,068)	(1,011)
Transfers into level 3	0	0	0
Transfers (out of) level 3	0	0	0
Fair value, ending balance	9,167	9,121	8,522
Change in unrealized gains/(losses) related to financial instruments held	48	762	467
Other assets
Assets:
Fair value, beginning balance	1,344	758	405
Total realized/unrealized gains/(losses)	(15)	105	(36)
Purchases	358	623	525
Sales	(66)	(62)	(20)
Settlements	(84)	(58)	(147)
Transfers into level 3	98	5	45
Transfers (out of) level 3	(588)	(27)	(14)
Fair value, ending balance	1,047	1,344	758
Change in unrealized gains/(losses) related to financial instruments held	$ 61	$ 88	$ (82)