Fair Value Measurement - Changes in Level 3 Recurring Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Net derivative receivables:
Fair value, beginning balance	$ (3,077)	$ (2,981)
Total realized/unrealized gains/(losses)	2,782	2,562
Purchases	482	529
Sales	(1,191)	(1,109)
Settlements	(18)	(822)
Transfers into level 3	263	(709)
Transfers (out of) level 3	126	198
Fair value, ending balance	(633)	(2,332)
Change in unrealized gains/(losses) related to financial instruments held	$ 2,561	2,455
Level 3 Rollforward Supplemental Data
Level 3 assets as a percentage of total firm assets at fair value	1.00%		1.00%
Level 3 liabilities as a percentage of total firm liabilities at fair value	6.00%		9.00%
Deposits
Liabilities:
Fair value, beginning balance	$ 2,356	2,185
Total realized/unrealized (gains)/losses	(88)	52
Purchases	0	0
Sales	0	0
Issuances	304	362
Settlements	(1,089)	(625)
Transfers into level 3	0	0
Transfers (out of) level 3	(179)	(25)
Fair value, ending balance	1,304	1,949
Change in unrealized (gains)/losses related to financials instruments held	(89)	48
Short-term borrowings
Liabilities:
Fair value, beginning balance	5,558	3,476
Total realized/unrealized (gains)/losses	(74)	49
Purchases	0	0
Sales	0	0
Issuances	3,923	2,360
Settlements	(3,544)	(1,812)
Transfers into level 3	7	10
Transfers (out of) level 3	(3)	(38)
Fair value, ending balance	5,867	4,045
Change in unrealized (gains)/losses related to financials instruments held	(130)	20
Trading liabilities – debt and equity instruments
Liabilities:
Fair value, beginning balance	326	46
Total realized/unrealized (gains)/losses	4	(10)
Purchases	(5)	0
Sales	10	11
Issuances	0	0
Settlements	0	0
Transfers into level 3	0	16
Transfers (out of) level 3	0	(19)
Fair value, ending balance	335	44
Change in unrealized (gains)/losses related to financials instruments held	8	(8)
Accounts payable and other liabilities
Liabilities:
Fair value, beginning balance	38	76
Total realized/unrealized (gains)/losses	7	(8)
Purchases	(2)	0
Sales	3	1
Issuances	0	0
Settlements	0	0
Transfers into level 3	1	0
Transfers (out of) level 3	0	(33)
Fair value, ending balance	47	36
Change in unrealized (gains)/losses related to financials instruments held	7	(8)
Long-term debt
Liabilities:
Fair value, beginning balance	46,673	34,564
Total realized/unrealized (gains)/losses	(1,190)	(210)
Purchases	0	0
Sales	0	0
Issuances	10,613	7,654
Settlements	(6,428)	(5,091)
Transfers into level 3	103	158
Transfers (out of) level 3	(599)	(593)
Fair value, ending balance	49,172	36,482
Change in unrealized (gains)/losses related to financials instruments held	(1,262)	(316)
DVA for fair value option elected liabilities
Level 3 Rollforward Supplemental Data
Unrealized (gains)/losses on liabilities recorded in OCI	(445)	(73)
Interest rate
Net derivative receivables:
Fair value, beginning balance	1,306	301
Total realized/unrealized gains/(losses)	318	597
Purchases	32	89
Sales	(105)	(117)
Settlements	49	139
Transfers into level 3	110	(60)
Transfers (out of) level 3	19	45
Fair value, ending balance	1,729	994
Change in unrealized gains/(losses) related to financial instruments held	356	666
Credit
Net derivative receivables:
Fair value, beginning balance	(1,135)	(363)
Total realized/unrealized gains/(losses)	1,496	(117)
Purchases	1	79
Sales	(42)	0
Settlements	(324)	(138)
Transfers into level 3	(8)	(146)
Transfers (out of) level 3	72	(18)
Fair value, ending balance	60	(703)
Change in unrealized gains/(losses) related to financial instruments held	1,483	(97)
Foreign exchange
Net derivative receivables:
Fair value, beginning balance	305	20
Total realized/unrealized gains/(losses)	68	232
Purchases	89	63
Sales	(114)	(153)
Settlements	88	69
Transfers into level 3	79	73
Transfers (out of) level 3	57	(6)
Fair value, ending balance	572	298
Change in unrealized gains/(losses) related to financial instruments held	68	175
Equity
Net derivative receivables:
Fair value, beginning balance	(3,537)	(2,866)
Total realized/unrealized gains/(losses)	690	1,747
Purchases	356	272
Sales	(800)	(777)
Settlements	89	(954)
Transfers into level 3	107	(577)
Transfers (out of) level 3	(44)	194
Fair value, ending balance	(3,139)	(2,961)
Change in unrealized gains/(losses) related to financial instruments held	426	1,600
Commodity
Net derivative receivables:
Fair value, beginning balance	(16)	(73)
Total realized/unrealized gains/(losses)	210	103
Purchases	4	26
Sales	(130)	(62)
Settlements	80	62
Transfers into level 3	(25)	1
Transfers (out of) level 3	22	(17)
Fair value, ending balance	145	40
Change in unrealized gains/(losses) related to financial instruments held	228	111
Total mortgage-backed securities
Assets:
Fair value, beginning balance	312	503
Total realized/unrealized gains/(losses)	3	0
Purchases	5	3
Sales	(34)	(88)
Settlements	(13)	(16)
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	273	402
Change in unrealized gains/(losses) related to financial instruments held	(1)	(7)
Mortgage-backed securities, U.S. GSEs and government agencies
Assets:
Fair value, beginning balance	307	488
Total realized/unrealized gains/(losses)	1	3
Purchases	1	3
Sales	(28)	(88)
Settlements	(13)	(16)
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	268	390
Change in unrealized gains/(losses) related to financial instruments held	(1)	(4)
Mortgage-backed securities, Residential - nonagency
Assets:
Fair value, beginning balance	5	5
Total realized/unrealized gains/(losses)	2	0
Purchases	4	0
Sales	(6)	0
Settlements	0	0
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	5	5
Change in unrealized gains/(losses) related to financial instruments held	0	0
Mortgage-backed securities, Commercial - nonagency
Assets:
Fair value, beginning balance	0	10
Total realized/unrealized gains/(losses)	0	(3)
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	0	7
Change in unrealized gains/(losses) related to financial instruments held	0	(3)
Trading liabilities – debt and equity instruments
Assets:
Fair value, beginning balance	2,794	2,442
Total realized/unrealized gains/(losses)	(18)	(43)
Purchases	402	599
Sales	(327)	(471)
Settlements	(87)	(148)
Transfers into level 3	225	288
Transfers (out of) level 3	(283)	(462)
Fair value, ending balance	2,706	2,205
Change in unrealized gains/(losses) related to financial instruments held	2	42
Total debt instruments
Assets:
Fair value, beginning balance	2,182	2,144
Total realized/unrealized gains/(losses)	(10)	13
Purchases	307	529
Sales	(219)	(431)
Settlements	(17)	(132)
Transfers into level 3	75	151
Transfers (out of) level 3	(249)	(455)
Fair value, ending balance	2,069	1,819
Change in unrealized gains/(losses) related to financial instruments held	(10)	90
Obligations of U.S. states and municipalities
Assets:
Fair value, beginning balance	1	1
Total realized/unrealized gains/(losses)	24	0
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into level 3	5	0
Transfers (out of) level 3	0	0
Fair value, ending balance	30	1
Change in unrealized gains/(losses) related to financial instruments held	24	0
Non-U.S. government debt securities
Assets:
Fair value, beginning balance	245	152
Total realized/unrealized gains/(losses)	(7)	12
Purchases	38	76
Sales	(61)	(78)
Settlements	0	(1)
Transfers into level 3	0	0
Transfers (out of) level 3	(8)	0
Fair value, ending balance	207	161
Change in unrealized gains/(losses) related to financial instruments held	(6)	29
Corporate debt securities
Assets:
Fair value, beginning balance	454	390
Total realized/unrealized gains/(losses)	(1)	7
Purchases	63	99
Sales	(30)	(51)
Settlements	0	(5)
Transfers into level 3	1	10
Transfers (out of) level 3	(5)	(8)
Fair value, ending balance	482	442
Change in unrealized gains/(losses) related to financial instruments held	2	75
Loans
Assets:
Fair value, beginning balance	1,143	1,088
Total realized/unrealized gains/(losses)	(29)	(6)
Purchases	201	351
Sales	(94)	(214)
Settlements	(3)	(110)
Transfers into level 3	69	141
Transfers (out of) level 3	(236)	(447)
Fair value, ending balance	1,051	803
Change in unrealized gains/(losses) related to financial instruments held	(29)	(7)
Asset-backed securities
Assets:
Fair value, beginning balance	27	10
Total realized/unrealized gains/(losses)	0	0
Purchases	0	0
Sales	0	0
Settlements	(1)	0
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	26	10
Change in unrealized gains/(losses) related to financial instruments held	0	0
Equity securities
Assets:
Fair value, beginning balance	138	62
Total realized/unrealized gains/(losses)	7	(4)
Purchases	46	61
Sales	(108)	(40)
Settlements	(4)	0
Transfers into level 3	96	61
Transfers (out of) level 3	(3)	(7)
Fair value, ending balance	172	133
Change in unrealized gains/(losses) related to financial instruments held	14	(3)
Physical commodities
Assets:
Fair value, beginning balance	30	26
Total realized/unrealized gains/(losses)	32	(10)
Purchases	0	0
Sales	0	0
Settlements	(51)	(2)
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	11	14
Change in unrealized gains/(losses) related to financial instruments held	29	(4)
Other
Assets:
Fair value, beginning balance	444	210
Total realized/unrealized gains/(losses)	(47)	(42)
Purchases	49	9
Sales	0	0
Settlements	(15)	(14)
Transfers into level 3	54	76
Transfers (out of) level 3	(31)	0
Fair value, ending balance	454	239
Change in unrealized gains/(losses) related to financial instruments held	(31)	(41)
Total available-for-sale securities
Assets:
Fair value, beginning balance	111	8
Total realized/unrealized gains/(losses)	3	0
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into level 3	0	0
Transfers (out of) level 3	(6)	0
Fair value, ending balance	108	8
Change in unrealized gains/(losses) related to financial instruments held	6	0
Commercial – nonagency
Assets:
Fair value, beginning balance	3	8
Total realized/unrealized gains/(losses)	(3)	0
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	0	8
Change in unrealized gains/(losses) related to financial instruments held	0	0
Corporate debt securities
Assets:
Fair value, beginning balance	108	0
Total realized/unrealized gains/(losses)	6	0
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into level 3	0	0
Transfers (out of) level 3	(6)	0
Fair value, ending balance	108	0
Change in unrealized gains/(losses) related to financial instruments held	6	0
Loans
Assets:
Fair value, beginning balance	3,062	2,416
Total realized/unrealized gains/(losses)	93	29
Purchases	148	54
Sales	(107)	(72)
Settlements	(176)	(300)
Transfers into level 3	340	453
Transfers (out of) level 3	(176)	(182)
Fair value, ending balance	3,184	2,398
Change in unrealized gains/(losses) related to financial instruments held	83	(13)
Mortgage servicing rights
Assets:
Fair value, beginning balance	9,167	9,121
Total realized/unrealized gains/(losses)	38	(127)
Purchases	156	390
Sales	2	4
Settlements	(270)	(261)
Transfers into level 3	0	0
Transfers (out of) level 3	0	0
Fair value, ending balance	9,093	9,127
Change in unrealized gains/(losses) related to financial instruments held	38	(127)
Other assets
Assets:
Fair value, beginning balance	1,047	1,344
Total realized/unrealized gains/(losses)	9	32
Purchases	21	12
Sales	(2)	(31)
Settlements	(4)	(10)
Transfers into level 3	1	56
Transfers (out of) level 3	(1)	(33)
Fair value, ending balance	1,071	1,370
Change in unrealized gains/(losses) related to financial instruments held	$ 9	$ 32