Derivative Instruments and Hedging Activities - Notionals of Derivative Contracts (Details) - USD ($) $ in Billions	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Notional Amount
Derivative assets	$ 17,713	$ 18,280
Derivative liabilities	18,368	19,069
Designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	115	94
Derivative liabilities	200	203
Designated as accounting hedges | Interest rate
Derivatives, Notional Amount
Derivative assets	103	92
Derivative liabilities	193	186
Designated as accounting hedges | Foreign exchange
Derivatives, Notional Amount
Derivative assets	12	2
Derivative liabilities	7	17
Not designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	17,598	18,186
Derivative liabilities	18,168	18,866
Economic hedges of loans | Credit
Derivatives, Notional Amount
Derivative assets	1	1
Derivative liabilities	24	24
Other derivatives | Interest rate
Derivatives, Notional Amount
Derivative assets	11,960	13,070
Derivative liabilities	12,139	13,283
Other derivatives | Credit
Derivatives, Notional Amount
Derivative assets	363	390
Derivative liabilities	359	384
Other derivatives | Foreign exchange
Derivatives, Notional Amount
Derivative assets	3,907	3,550
Derivative liabilities	3,922	3,696
Other derivatives | Equity
Derivatives, Notional Amount
Derivative assets	1,153	968
Derivative liabilities	1,514	1,299
Other derivatives | Commodity and other
Derivatives, Notional Amount
Derivative assets	214	207
Derivative liabilities	210	180
Bilateral OTC
Derivatives, Notional Amount
Derivative assets	8,611	8,416
Derivative liabilities	8,982	9,063
Bilateral OTC | Designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	10	1
Derivative liabilities	7	17
Bilateral OTC | Designated as accounting hedges | Interest rate
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	2	3
Bilateral OTC | Designated as accounting hedges | Foreign exchange
Derivatives, Notional Amount
Derivative assets	10	1
Derivative liabilities	5	14
Bilateral OTC | Not designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	8,601	8,415
Derivative liabilities	8,975	9,046
Bilateral OTC | Economic hedges of loans | Credit
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	2	2
Bilateral OTC | Other derivatives | Interest rate
Derivatives, Notional Amount
Derivative assets	3,947	4,153
Derivative liabilities	4,231	4,631
Bilateral OTC | Other derivatives | Credit
Derivatives, Notional Amount
Derivative assets	225	214
Derivative liabilities	237	229
Bilateral OTC | Other derivatives | Foreign exchange
Derivatives, Notional Amount
Derivative assets	3,690	3,378
Derivative liabilities	3,695	3,496
Bilateral OTC | Other derivatives | Equity
Derivatives, Notional Amount
Derivative assets	609	528
Derivative liabilities	695	587
Bilateral OTC | Other derivatives | Commodity and other
Derivatives, Notional Amount
Derivative assets	130	142
Derivative liabilities	115	101
Cleared OTC
Derivatives, Notional Amount
Derivative assets	8,007	8,792
Derivative liabilities	8,020	8,727
Cleared OTC | Designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	105	93
Derivative liabilities	193	186
Cleared OTC | Designated as accounting hedges | Interest rate
Derivatives, Notional Amount
Derivative assets	103	92
Derivative liabilities	191	183
Cleared OTC | Designated as accounting hedges | Foreign exchange
Derivatives, Notional Amount
Derivative assets	2	1
Derivative liabilities	2	3
Cleared OTC | Not designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	7,902	8,699
Derivative liabilities	7,827	8,541
Cleared OTC | Economic hedges of loans | Credit
Derivatives, Notional Amount
Derivative assets	1	1
Derivative liabilities	22	22
Cleared OTC | Other derivatives | Interest rate
Derivatives, Notional Amount
Derivative assets	7,559	8,357
Derivative liabilities	7,485	8,197
Cleared OTC | Other derivatives | Credit
Derivatives, Notional Amount
Derivative assets	138	176
Derivative liabilities	122	155
Cleared OTC | Other derivatives | Foreign exchange
Derivatives, Notional Amount
Derivative assets	204	165
Derivative liabilities	198	167
Cleared OTC | Other derivatives | Equity
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Cleared OTC | Other derivatives | Commodity and other
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Exchange- Traded
Derivatives, Notional Amount
Derivative assets	1,095	1,072
Derivative liabilities	1,366	1,279
Exchange- Traded | Designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Exchange- Traded | Designated as accounting hedges | Interest rate
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Exchange- Traded | Designated as accounting hedges | Foreign exchange
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Exchange- Traded | Not designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	1,095	1,072
Derivative liabilities	1,366	1,279
Exchange- Traded | Economic hedges of loans | Credit
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Exchange- Traded | Other derivatives | Interest rate
Derivatives, Notional Amount
Derivative assets	454	560
Derivative liabilities	423	455
Exchange- Traded | Other derivatives | Credit
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Exchange- Traded | Other derivatives | Foreign exchange
Derivatives, Notional Amount
Derivative assets	13	7
Derivative liabilities	29	33
Exchange- Traded | Other derivatives | Equity
Derivatives, Notional Amount
Derivative assets	544	440
Derivative liabilities	819	712
Exchange- Traded | Other derivatives | Commodity and other
Derivatives, Notional Amount
Derivative assets	84	65
Derivative liabilities	$ 95	$ 79