Fair Values - Activity of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - Level 3 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Liabilities at Fair Value
Portion of Unrealized losses (gains) recorded in OCI—Change in net DVA	$ 1	$ (2)
Deposits
Liabilities at Fair Value
Beginning balance	1	1
Issuances	0	2
Settlements	0	(1)
Net transfers	0	1
Ending balance	1	3
Unrealized losses (gains)	0	0
Nonderivative trading liabilities
Liabilities at Fair Value
Beginning balance	82	110
Realized and unrealized losses (gains)	(3)	(4)
Purchases	(23)	(26)
Sales	18	25
Net transfers	(1)	(77)
Ending balance	73	28
Unrealized losses (gains)	(2)	0
Securities sold under agreements to repurchase
Liabilities at Fair Value
Beginning balance	445	444
Realized and unrealized losses (gains)	4	13
Net transfers	0	203
Ending balance	449	660
Unrealized losses (gains)	4	13
Other secured financings
Liabilities at Fair Value
Beginning balance	306	76
Realized and unrealized losses (gains)	0	10
Issuances	32	139
Settlements	(155)	(5)
Net transfers	(2)	215
Ending balance	181	435
Unrealized losses (gains)	0	10
Borrowings
Liabilities at Fair Value
Beginning balance	608	947
Realized and unrealized losses (gains)	(58)	7
Issuances	287	91
Settlements	(50)	(86)
Net transfers	150	(57)
Ending balance	937	902
Unrealized losses (gains)	(57)	3
Net derivatives: Interest rate
Assets at Fair value
Beginning balance	(154)	(53)
Realized and unrealized gains (losses)	31	(119)
Purchases	92	10
Issuances	(78)	(12)
Settlements	(62)	18
Net transfers	20	33
Ending balance	(151)	(123)
Unrealized gains (losses)	(10)	(116)
Net derivatives: Credit
Assets at Fair value
Beginning balance	87	97
Realized and unrealized gains (losses)	14	(22)
Issuances	(1)	0
Settlements	42	34
Net transfers	6	20
Ending balance	148	129
Unrealized gains (losses)	5	(54)
Net derivatives: Foreign exchange
Assets at Fair value
Beginning balance	36	589
Realized and unrealized gains (losses)	(77)	(243)
Settlements	47	(30)
Net transfers	(50)	(11)
Ending balance	(44)	305
Unrealized gains (losses)	(79)	(201)
Net derivatives: Equity
Assets at Fair value
Beginning balance	(1,433)	(1,148)
Realized and unrealized gains (losses)	547	380
Purchases	102	175
Issuances	(308)	(144)
Settlements	(200)	(288)
Net transfers	(23)	140
Ending balance	(1,315)	(885)
Unrealized gains (losses)	411	298
Net derivatives: Commodity and other
Assets at Fair value
Beginning balance	920	1,308
Realized and unrealized gains (losses)	386	23
Purchases	38	22
Issuances	(405)	(22)
Settlements	74	(64)
Net transfers	207	(405)
Ending balance	1,220	862
Unrealized gains (losses)	591	(5)
Other sovereign government obligations
Assets at Fair value
Beginning balance	59	17
Realized and unrealized gains (losses)	0	(1)
Purchases	1	5
Sales	(4)	(3)
Net transfers	(1)	11
Ending balance	55	29
Unrealized gains (losses)	0	0
MABS
Assets at Fair value
Beginning balance	317	281
Realized and unrealized gains (losses)	9	0
Purchases	122	92
Sales	(62)	(78)
Net transfers	243	51
Ending balance	629	346
Unrealized gains (losses)	3	0
Loans and lending commitments
Assets at Fair value
Beginning balance	1,424	1,059
Realized and unrealized gains (losses)	(4)	6
Purchases and originations	572	759
Sales	(759)	(432)
Settlements	0	(12)
Net transfers	434	646
Ending balance	1,667	2,026
Unrealized gains (losses)	(18)	7
Corporate and other debt
Assets at Fair value
Beginning balance	1,414	1,258
Realized and unrealized gains (losses)	(51)	(33)
Purchases and originations	524	426
Sales	(402)	(275)
Net transfers	(10)	58
Ending balance	1,475	1,434
Unrealized gains (losses)	(52)	(1)
Corporate equities
Assets at Fair value
Beginning balance	276	154
Realized and unrealized gains (losses)	12	(21)
Purchases	29	52
Sales	(186)	(57)
Net transfers	53	35
Ending balance	184	163
Unrealized gains (losses)	13	0
Investments
Assets at Fair value
Beginning balance	1,507	754
Realized and unrealized gains (losses)	12	22
Purchases	79	24
Sales	(15)	(25)
Net transfers	4	4
Ending balance	1,587	779
Unrealized gains (losses)	$ 7	$ 10

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases and Originations

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