Derivative Instruments and Hedging Activities - Fair Values of Derivative Contracts (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative Assets
Total gross derivatives	$ 411,250	$ 337,291
Counterparty netting	(306,403)	(254,430)
Cash collateral netting	(49,766)	(44,707)
Total in Trading assets	55,081	38,154
Financial instruments collateral	(21,576)	(10,457)
Net amounts	33,505	27,697
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	8,620	6,725
Derivative Liabilities
Total gross derivatives	395,644	333,504
Amounts offset against counterparty netting	(306,403)	(254,430)
Amounts offset against cash collateral netting	(49,387)	(44,506)
Total in Trading liabilities	39,854	34,568
Amounts not offset against financial instruments collateral	(5,653)	(5,913)
Net amounts	34,201	28,655
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	8,001	6,194
Designated as accounting hedges
Derivative Assets
Total gross derivatives	521	792
Derivative Liabilities
Total gross derivatives	343	194
Designated as accounting hedges | Interest rate contracts
Derivative Assets
Total gross derivatives	154	595
Derivative Liabilities
Total gross derivatives	334	87
Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	367	197
Derivative Liabilities
Total gross derivatives	9	107
Not designated as accounting hedges
Derivative Assets
Total gross derivatives	410,729	336,499
Derivative Liabilities
Total gross derivatives	395,301	333,310
Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	105	15
Derivative Liabilities
Total gross derivatives	248	429
Other derivatives | Interest rate contracts
Derivative Assets
Total gross derivatives	169,305	154,970
Derivative Liabilities
Total gross derivatives	158,635	147,115
Other derivatives | Credit
Derivative Assets
Total gross derivatives	12,203	8,935
Derivative Liabilities
Total gross derivatives	11,585	9,072
Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	120,717	74,534
Derivative Liabilities
Total gross derivatives	113,303	73,088
Other derivatives | Equity
Derivative Assets
Total gross derivatives	59,631	70,332
Derivative Liabilities
Total gross derivatives	69,469	80,678
Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	48,768	27,713
Derivative Liabilities
Total gross derivatives	42,061	22,928
Bilateral OTC
Derivative Assets
Total gross derivatives	328,334	278,447
Counterparty netting	(228,091)	(201,729)
Cash collateral netting	(48,546)	(43,495)
Total in Trading assets	51,697	33,223
Financial instruments collateral	(21,576)	(10,457)
Net amounts	30,121	22,766
Derivative Liabilities
Total gross derivatives	307,846	275,175
Amounts offset against counterparty netting	(228,091)	(201,729)
Amounts offset against cash collateral netting	(46,548)	(43,305)
Total in Trading liabilities	33,207	30,141
Amounts not offset against financial instruments collateral	(2,431)	(5,866)
Net amounts	30,776	24,275
Bilateral OTC | Designated as accounting hedges
Derivative Assets
Total gross derivatives	456	785
Derivative Liabilities
Total gross derivatives	338	143
Bilateral OTC | Designated as accounting hedges | Interest rate contracts
Derivative Assets
Total gross derivatives	148	594
Derivative Liabilities
Total gross derivatives	334	86
Bilateral OTC | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	308	191
Derivative Liabilities
Total gross derivatives	4	57
Bilateral OTC | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	327,878	277,662
Derivative Liabilities
Total gross derivatives	307,508	275,032
Bilateral OTC | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	7	0
Derivative Liabilities
Total gross derivatives	10	17
Bilateral OTC | Other derivatives | Interest rate contracts
Derivative Assets
Total gross derivatives	139,530	147,585
Derivative Liabilities
Total gross derivatives	128,906	140,770
Bilateral OTC | Other derivatives | Credit
Derivative Assets
Total gross derivatives	9,429	5,749
Derivative Liabilities
Total gross derivatives	8,706	5,609
Bilateral OTC | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	117,553	73,276
Derivative Liabilities
Total gross derivatives	110,398	71,851
Bilateral OTC | Other derivatives | Equity
Derivative Assets
Total gross derivatives	24,787	28,877
Derivative Liabilities
Total gross derivatives	30,920	39,597
Bilateral OTC | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	36,572	22,175
Derivative Liabilities
Total gross derivatives	28,568	17,188
Cleared OTC
Derivative Assets
Total gross derivatives	33,963	11,429
Counterparty netting	(31,597)	(9,818)
Cash collateral netting	(1,220)	(1,212)
Total in Trading assets	1,146	399
Financial instruments collateral	0	0
Net amounts	1,146	399
Derivative Liabilities
Total gross derivatives	34,796	11,234
Amounts offset against counterparty netting	(31,597)	(9,818)
Amounts offset against cash collateral netting	(2,839)	(1,201)
Total in Trading liabilities	360	215
Amounts not offset against financial instruments collateral	0	(8)
Net amounts	360	207
Cleared OTC | Designated as accounting hedges
Derivative Assets
Total gross derivatives	65	7
Derivative Liabilities
Total gross derivatives	5	51
Cleared OTC | Designated as accounting hedges | Interest rate contracts
Derivative Assets
Total gross derivatives	6	1
Derivative Liabilities
Total gross derivatives	0	1
Cleared OTC | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	59	6
Derivative Liabilities
Total gross derivatives	5	50
Cleared OTC | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	33,898	11,422
Derivative Liabilities
Total gross derivatives	34,791	11,183
Cleared OTC | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	98	15
Derivative Liabilities
Total gross derivatives	238	412
Cleared OTC | Other derivatives | Interest rate contracts
Derivative Assets
Total gross derivatives	27,927	7,002
Derivative Liabilities
Total gross derivatives	28,846	6,112
Cleared OTC | Other derivatives | Credit
Derivative Assets
Total gross derivatives	2,774	3,186
Derivative Liabilities
Total gross derivatives	2,879	3,463
Cleared OTC | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	3,099	1,219
Derivative Liabilities
Total gross derivatives	2,828	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	48,953	47,415
Counterparty netting	(46,715)	(42,883)
Cash collateral netting	0	0
Total in Trading assets	2,238	4,532
Financial instruments collateral	0	0
Net amounts	2,238	4,532
Derivative Liabilities
Total gross derivatives	53,002	47,095
Amounts offset against counterparty netting	(46,715)	(42,883)
Amounts offset against cash collateral netting	0	0
Total in Trading liabilities	6,287	4,212
Amounts not offset against financial instruments collateral	(3,222)	(39)
Net amounts	3,065	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 contracts
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	48,953	47,415
Derivative Liabilities
Total gross derivatives	53,002	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 contracts
Derivative Assets
Total gross derivatives	1,848	383
Derivative Liabilities
Total gross derivatives	883	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	65	39
Derivative Liabilities
Total gross derivatives	77	41
Exchange- Traded | Other derivatives | Equity
Derivative Assets
Total gross derivatives	34,844	41,455
Derivative Liabilities
Total gross derivatives	38,549	41,081
Exchange- Traded | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	12,196	5,538
Derivative Liabilities
Total gross derivatives	$ 13,493	$ 5,740