Derivative Instruments and Hedging Activities - Fair Values of Derivative Contracts (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Assets
Total gross derivatives	$ 402,643	$ 337,291
Amounts offset against counterparty netting	(298,530)	(254,430)
Amounts offset against cash collateral netting	(46,232)	(44,707)
Total in Trading assets	57,881	38,154
Amounts not offset against financial instruments collateral	(18,000)	(10,457)
Net amounts	39,881	27,697
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	10,704	6,725
Derivative Liabilities
Total gross derivatives	386,875	333,504
Amounts offset against counterparty netting	(298,530)	(254,430)
Amounts offset against cash collateral netting	(45,988)	(44,506)
Total in Trading liabilities	42,357	34,568
Amounts not offset against financial instruments collateral	(5,184)	(5,913)
Net amounts	37,173	28,655
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	8,824	6,194
Designated as accounting hedges
Derivative Assets
Total gross derivatives	454	792
Derivative Liabilities
Total gross derivatives	146	194
Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	238	595
Derivative Liabilities
Total gross derivatives	51	87
Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	216	197
Derivative Liabilities
Total gross derivatives	95	107
Not designated as accounting hedges
Derivative Assets
Total gross derivatives	402,189	336,499
Derivative Liabilities
Total gross derivatives	386,729	333,310
Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	14	15
Derivative Liabilities
Total gross derivatives	323	429
Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	174,389	154,970
Derivative Liabilities
Total gross derivatives	165,291	147,115
Other derivatives | Credit
Derivative Assets
Total gross derivatives	11,492	8,935
Derivative Liabilities
Total gross derivatives	11,179	9,072
Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	101,079	74,534
Derivative Liabilities
Total gross derivatives	93,200	73,088
Other derivatives | Equity
Derivative Assets
Total gross derivatives	65,909	70,332
Derivative Liabilities
Total gross derivatives	73,898	80,678
Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	49,306	27,713
Derivative Liabilities
Total gross derivatives	42,838	22,928
Bilateral OTC
Derivative Assets
Total gross derivatives	319,977	278,447
Amounts offset against counterparty netting	(222,597)	(201,729)
Amounts offset against cash collateral netting	(44,621)	(43,495)
Total in Trading assets	52,759	33,223
Amounts not offset against financial instruments collateral	(18,000)	(10,457)
Net amounts	34,759	22,766
Derivative Liabilities
Total gross derivatives	301,629	275,175
Amounts offset against counterparty netting	(222,597)	(201,729)
Amounts offset against cash collateral netting	(44,557)	(43,305)
Total in Trading liabilities	34,475	30,141
Amounts not offset against financial instruments collateral	(3,641)	(5,866)
Net amounts	30,834	24,275
Bilateral OTC | Designated as accounting hedges
Derivative Assets
Total gross derivatives	437	785
Derivative Liabilities
Total gross derivatives	110	143
Bilateral OTC | Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	235	594
Derivative Liabilities
Total gross derivatives	51	86
Bilateral OTC | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	202	191
Derivative Liabilities
Total gross derivatives	59	57
Bilateral OTC | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	319,540	277,662
Derivative Liabilities
Total gross derivatives	301,519	275,032
Bilateral OTC | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	2	0
Derivative Liabilities
Total gross derivatives	15	17
Bilateral OTC | Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	152,234	147,585
Derivative Liabilities
Total gross derivatives	142,935	140,770
Bilateral OTC | Other derivatives | Credit
Derivative Assets
Total gross derivatives	7,494	5,749
Derivative Liabilities
Total gross derivatives	7,029	5,609
Bilateral OTC | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	97,624	73,276
Derivative Liabilities
Total gross derivatives	90,134	71,851
Bilateral OTC | Other derivatives | Equity
Derivative Assets
Total gross derivatives	27,669	28,877
Derivative Liabilities
Total gross derivatives	34,116	39,597
Bilateral OTC | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	34,517	22,175
Derivative Liabilities
Total gross derivatives	27,290	17,188
Cleared OTC
Derivative Assets
Total gross derivatives	28,046	11,429
Amounts offset against counterparty netting	(25,328)	(9,818)
Amounts offset against cash collateral netting	(1,611)	(1,212)
Total in Trading assets	1,107	399
Amounts not offset against financial instruments collateral	0	0
Net amounts	1,107	399
Derivative Liabilities
Total gross derivatives	28,832	11,234
Amounts offset against counterparty netting	(25,328)	(9,818)
Amounts offset against cash collateral netting	(1,431)	(1,201)
Total in Trading liabilities	2,073	215
Amounts not offset against financial instruments collateral	0	(8)
Net amounts	2,073	207
Cleared OTC | Designated as accounting hedges
Derivative Assets
Total gross derivatives	17	7
Derivative Liabilities
Total gross derivatives	36	51
Cleared OTC | Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	3	1
Derivative Liabilities
Total gross derivatives	0	1
Cleared OTC | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	14	6
Derivative Liabilities
Total gross derivatives	36	50
Cleared OTC | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	28,029	11,422
Derivative Liabilities
Total gross derivatives	28,796	11,183
Cleared OTC | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	12	15
Derivative Liabilities
Total gross derivatives	308	412
Cleared OTC | Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	20,630	7,002
Derivative Liabilities
Total gross derivatives	21,368	6,112
Cleared OTC | Other derivatives | Credit
Derivative Assets
Total gross derivatives	3,998	3,186
Derivative Liabilities
Total gross derivatives	4,150	3,463
Cleared OTC | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	3,389	1,219
Derivative Liabilities
Total gross derivatives	2,970	1,196
Cleared OTC | Other derivatives | Equity
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Cleared OTC | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Exchange- Traded
Derivative Assets
Total gross derivatives	54,620	47,415
Amounts offset against counterparty netting	(50,605)	(42,883)
Amounts offset against cash collateral netting	0	0
Total in Trading assets	4,015	4,532
Amounts not offset against financial instruments collateral	0	0
Net amounts	4,015	4,532
Derivative Liabilities
Total gross derivatives	56,414	47,095
Amounts offset against counterparty netting	(50,605)	(42,883)
Amounts offset against cash collateral netting	0	0
Total in Trading liabilities	5,809	4,212
Amounts not offset against financial instruments collateral	(1,543)	(39)
Net amounts	4,266	4,173
Exchange- Traded | Designated as accounting hedges
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Exchange- Traded | Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Exchange- Traded | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Exchange- Traded | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	54,620	47,415
Derivative Liabilities
Total gross derivatives	56,414	47,095
Exchange- Traded | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Exchange- Traded | Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	1,525	383
Derivative Liabilities
Total gross derivatives	988	233
Exchange- Traded | Other derivatives | Credit
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Exchange- Traded | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	66	39
Derivative Liabilities
Total gross derivatives	96	41
Exchange- Traded | Other derivatives | Equity
Derivative Assets
Total gross derivatives	38,240	41,455
Derivative Liabilities
Total gross derivatives	39,782	41,081
Exchange- Traded | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	14,789	5,538
Derivative Liabilities
Total gross derivatives	$ 15,548	$ 5,740