Derivative Instruments and Hedging Activities - Notionals of Derivative Contracts (Details) - USD ($) $ in Billions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Notional Amount
Derivative assets	$ 16,183	$ 15,706
Derivative liabilities	16,626	16,280
Bilateral OTC
Derivatives, Notional Amount
Derivative assets	7,736	7,592
Derivative liabilities	8,080	7,901
Cleared OTC
Derivatives, Notional Amount
Derivative assets	7,387	7,260
Derivative liabilities	7,273	7,198
Exchange- Traded
Derivatives, Notional Amount
Derivative assets	1,060	854
Derivative liabilities	1,273	1,181
Designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	117	131
Derivative liabilities	107	94
Designated as accounting hedges | Interest rate
Derivatives, Notional Amount
Derivative assets	108	129
Derivative liabilities	99	80
Designated as accounting hedges | Foreign exchange
Derivatives, Notional Amount
Derivative assets	9	2
Derivative liabilities	8	14
Designated as accounting hedges | Bilateral OTC
Derivatives, Notional Amount
Derivative assets	12	8
Derivative liabilities	5	11
Designated as accounting hedges | Bilateral OTC | Interest rate
Derivatives, Notional Amount
Derivative assets	4	6
Derivative liabilities	0	0
Designated as accounting hedges | Bilateral OTC | Foreign exchange
Derivatives, Notional Amount
Derivative assets	8	2
Derivative liabilities	5	11
Designated as accounting hedges | Cleared OTC
Derivatives, Notional Amount
Derivative assets	105	123
Derivative liabilities	102	83
Designated as accounting hedges | Cleared OTC | Interest rate
Derivatives, Notional Amount
Derivative assets	104	123
Derivative liabilities	99	80
Designated as accounting hedges | Cleared OTC | Foreign exchange
Derivatives, Notional Amount
Derivative assets	1	0
Derivative liabilities	3	3
Designated as accounting hedges | Exchange- Traded
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Designated as accounting hedges | Exchange- Traded | Interest rate
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Designated as accounting hedges | Exchange- Traded | Foreign exchange
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Not designated as accounting hedges
Derivatives, Notional Amount
Derivative assets	16,066	15,575
Derivative liabilities	16,519	16,186
Not designated as accounting hedges | Bilateral OTC
Derivatives, Notional Amount
Derivative assets	7,724	7,584
Derivative liabilities	8,075	7,890
Not designated as accounting hedges | Cleared OTC
Derivatives, Notional Amount
Derivative assets	7,282	7,137
Derivative liabilities	7,171	7,115
Not designated as accounting hedges | Exchange- Traded
Derivatives, Notional Amount
Derivative assets	1,060	854
Derivative liabilities	1,273	1,181
Economic hedges of loans | Credit
Derivatives, Notional Amount
Derivative assets	0	1
Derivative liabilities	13	6
Economic hedges of loans | Bilateral OTC | Credit
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	1	1
Economic hedges of loans | Cleared OTC | Credit
Derivatives, Notional Amount
Derivative assets	0	1
Derivative liabilities	12	5
Economic hedges of loans | Exchange- Traded | Credit
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Other derivatives | Interest rate
Derivatives, Notional Amount
Derivative assets	11,140	11,202
Derivative liabilities	11,237	11,426
Other derivatives | Foreign exchange
Derivatives, Notional Amount
Derivative assets	3,491	3,159
Derivative liabilities	3,460	3,293
Other derivatives | Credit
Derivatives, Notional Amount
Derivative assets	321	227
Derivative liabilities	331	235
Other derivatives | Equity
Derivatives, Notional Amount
Derivative assets	902	811
Derivative liabilities	1,287	1,065
Other derivatives | Commodity and other
Derivatives, Notional Amount
Derivative assets	212	175
Derivative liabilities	191	161
Other derivatives | Bilateral OTC | Interest rate
Derivatives, Notional Amount
Derivative assets	3,488	3,847
Derivative liabilities	3,827	4,000
Other derivatives | Bilateral OTC | Foreign exchange
Derivatives, Notional Amount
Derivative assets	3,386	3,046
Derivative liabilities	3,360	3,180
Other derivatives | Bilateral OTC | Credit
Derivatives, Notional Amount
Derivative assets	216	140
Derivative liabilities	225	142
Other derivatives | Bilateral OTC | Equity
Derivatives, Notional Amount
Derivative assets	495	444
Derivative liabilities	552	474
Other derivatives | Bilateral OTC | Commodity and other
Derivatives, Notional Amount
Derivative assets	139	107
Derivative liabilities	110	93
Other derivatives | Cleared OTC | Interest rate
Derivatives, Notional Amount
Derivative assets	7,082	6,946
Derivative liabilities	6,965	6,915
Other derivatives | Cleared OTC | Foreign exchange
Derivatives, Notional Amount
Derivative assets	95	103
Derivative liabilities	88	102
Other derivatives | Cleared OTC | Credit
Derivatives, Notional Amount
Derivative assets	105	87
Derivative liabilities	106	93
Other derivatives | Cleared OTC | Equity
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Other derivatives | Cleared OTC | Commodity and other
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Other derivatives | Exchange- Traded | Interest rate
Derivatives, Notional Amount
Derivative assets	570	409
Derivative liabilities	445	511
Other derivatives | Exchange- Traded | Foreign exchange
Derivatives, Notional Amount
Derivative assets	10	10
Derivative liabilities	12	11
Other derivatives | Exchange- Traded | Credit
Derivatives, Notional Amount
Derivative assets	0	0
Derivative liabilities	0	0
Other derivatives | Exchange- Traded | Equity
Derivatives, Notional Amount
Derivative assets	407	367
Derivative liabilities	735	591
Other derivatives | Exchange- Traded | Commodity and other
Derivatives, Notional Amount
Derivative assets	73	68
Derivative liabilities	$ 81	$ 68