Derivative Instruments and Hedging Activities - Fair Values of Derivative Contracts (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Assets
Total gross derivatives	$ 337,291	$ 418,179
Amounts offset against counterparty netting	(254,430)	(323,543)
Amounts offset against cash collateral netting	(44,707)	(56,786)
Total in Trading assets	38,154	37,850
Amounts not offset against financial instruments collateral	(10,457)	(13,319)
Amounts not offset against other cash collateral		(391)
Net amounts	27,697	24,140
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	6,725	3,743
Derivative Liabilities
Total gross derivatives	333,504	420,416
Amounts offset against counterparty netting	(254,430)	(323,543)
Amounts offset against cash collateral netting	(44,506)	(51,935)
Total in Trading liabilities	34,568	44,938
Amounts not offset against financial instruments collateral	(5,913)	(12,118)
Amounts not offset against other cash collateral		(65)
Net amounts	28,655	32,755
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	6,194	6,746
Bilateral OTC
Derivative Assets
Total gross derivatives	278,447	365,896
Amounts offset against counterparty netting	(201,729)	(276,682)
Amounts offset against cash collateral netting	(43,495)	(54,921)
Total in Trading assets	33,223	34,293
Amounts not offset against financial instruments collateral	(10,457)	(13,319)
Amounts not offset against other cash collateral		(391)
Net amounts	22,766	20,583
Derivative Liabilities
Total gross derivatives	275,175	367,348
Amounts offset against counterparty netting	(201,729)	(276,682)
Amounts offset against cash collateral netting	(43,305)	(51,112)
Total in Trading liabilities	30,141	39,554
Amounts not offset against financial instruments collateral	(5,866)	(10,598)
Amounts not offset against other cash collateral		(62)
Net amounts	24,275	28,894
Cleared OTC
Derivative Assets
Total gross derivatives	11,429	14,184
Amounts offset against counterparty netting	(9,818)	(11,601)
Amounts offset against cash collateral netting	(1,212)	(1,865)
Total in Trading assets	399	718
Amounts not offset against financial instruments collateral	0	0
Amounts not offset against other cash collateral		0
Net amounts	399	718
Derivative Liabilities
Total gross derivatives	11,234	12,442
Amounts offset against counterparty netting	(9,818)	(11,601)
Amounts offset against cash collateral netting	(1,201)	(823)
Total in Trading liabilities	215	18
Amounts not offset against financial instruments collateral	(8)	0
Amounts not offset against other cash collateral		(3)
Net amounts	207	15
Exchange- Traded
Derivative Assets
Total gross derivatives	47,415	38,099
Amounts offset against counterparty netting	(42,883)	(35,260)
Amounts offset against cash collateral netting	0	0
Total in Trading assets	4,532	2,839
Amounts not offset against financial instruments collateral	0	0
Amounts not offset against other cash collateral		0
Net amounts	4,532	2,839
Derivative Liabilities
Total gross derivatives	47,095	40,626
Amounts offset against counterparty netting	(42,883)	(35,260)
Amounts offset against cash collateral netting	0	0
Total in Trading liabilities	4,212	5,366
Amounts not offset against financial instruments collateral	(39)	(1,520)
Amounts not offset against other cash collateral		0
Net amounts	4,173	3,846
Designated as accounting hedges
Derivative Assets
Total gross derivatives	792	955
Derivative Liabilities
Total gross derivatives	194	409
Designated as accounting hedges | Bilateral OTC
Derivative Assets
Total gross derivatives	785	951
Derivative Liabilities
Total gross derivatives	143	291
Designated as accounting hedges | Cleared OTC
Derivative Assets
Total gross derivatives	7	4
Derivative Liabilities
Total gross derivatives	51	118
Designated as accounting hedges | Exchange- Traded
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	595	948
Derivative Liabilities
Total gross derivatives	87	19
Designated as accounting hedges | Interest rate | Bilateral OTC
Derivative Assets
Total gross derivatives	594	946
Derivative Liabilities
Total gross derivatives	86	0
Designated as accounting hedges | Interest rate | Cleared OTC
Derivative Assets
Total gross derivatives	1	2
Derivative Liabilities
Total gross derivatives	1	19
Designated as accounting hedges | Interest rate | Exchange- Traded
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	197	7
Derivative Liabilities
Total gross derivatives	107	390
Designated as accounting hedges | Foreign exchange | Bilateral OTC
Derivative Assets
Total gross derivatives	191	5
Derivative Liabilities
Total gross derivatives	57	291
Designated as accounting hedges | Foreign exchange | Cleared OTC
Derivative Assets
Total gross derivatives	6	2
Derivative Liabilities
Total gross derivatives	50	99
Designated as accounting hedges | Foreign exchange | Exchange- Traded
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Not designated as accounting hedges
Derivative Assets
Total gross derivatives	336,499	417,224
Derivative Liabilities
Total gross derivatives	333,310	420,007
Not designated as accounting hedges | Bilateral OTC
Derivative Assets
Total gross derivatives	277,662	364,945
Derivative Liabilities
Total gross derivatives	275,032	367,057
Not designated as accounting hedges | Cleared OTC
Derivative Assets
Total gross derivatives	11,422	14,180
Derivative Liabilities
Total gross derivatives	11,183	12,324
Not designated as accounting hedges | Exchange- Traded
Derivative Assets
Total gross derivatives	47,415	38,099
Derivative Liabilities
Total gross derivatives	47,095	40,626
Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	15	53
Derivative Liabilities
Total gross derivatives	429	195
Economic hedges of loans | Credit | Bilateral OTC
Derivative Assets
Total gross derivatives	0	2
Derivative Liabilities
Total gross derivatives	17	18
Economic hedges of loans | Credit | Cleared OTC
Derivative Assets
Total gross derivatives	15	51
Derivative Liabilities
Total gross derivatives	412	177
Economic hedges of loans | Credit | Exchange- Traded
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	154,970	232,538
Derivative Liabilities
Total gross derivatives	147,115	218,619
Other derivatives | Interest rate | Bilateral OTC
Derivative Assets
Total gross derivatives	147,585	221,895
Derivative Liabilities
Total gross derivatives	140,770	210,015
Other derivatives | Interest rate | Cleared OTC
Derivative Assets
Total gross derivatives	7,002	10,343
Derivative Liabilities
Total gross derivatives	6,112	7,965
Other derivatives | Interest rate | Exchange- Traded
Derivative Assets
Total gross derivatives	383	300
Derivative Liabilities
Total gross derivatives	233	639
Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	74,534	94,052
Derivative Liabilities
Total gross derivatives	73,088	94,518
Other derivatives | Foreign exchange | Bilateral OTC
Derivative Assets
Total gross derivatives	73,276	92,334
Derivative Liabilities
Total gross derivatives	71,851	92,975
Other derivatives | Foreign exchange | Cleared OTC
Derivative Assets
Total gross derivatives	1,219	1,639
Derivative Liabilities
Total gross derivatives	1,196	1,500
Other derivatives | Foreign exchange | Exchange- Traded
Derivative Assets
Total gross derivatives	39	79
Derivative Liabilities
Total gross derivatives	41	43
Other derivatives | Credit
Derivative Assets
Total gross derivatives	8,935	7,488
Derivative Liabilities
Total gross derivatives	9,072	7,957
Other derivatives | Credit | Bilateral OTC
Derivative Assets
Total gross derivatives	5,749	5,341
Derivative Liabilities
Total gross derivatives	5,609	5,275
Other derivatives | Credit | Cleared OTC
Derivative Assets
Total gross derivatives	3,186	2,147
Derivative Liabilities
Total gross derivatives	3,463	2,682
Other derivatives | Credit | Exchange- Traded
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Other derivatives | Equity
Derivative Assets
Total gross derivatives	70,332	68,444
Derivative Liabilities
Total gross derivatives	80,678	86,528
Other derivatives | Equity | Bilateral OTC
Derivative Assets
Total gross derivatives	28,877	34,278
Derivative Liabilities
Total gross derivatives	39,597	49,943
Other derivatives | Equity | Cleared OTC
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Other derivatives | Equity | Exchange- Traded
Derivative Assets
Total gross derivatives	41,455	34,166
Derivative Liabilities
Total gross derivatives	41,081	36,585
Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	27,713	14,649
Derivative Liabilities
Total gross derivatives	22,928	12,190
Other derivatives | Commodity and other | Bilateral OTC
Derivative Assets
Total gross derivatives	22,175	11,095
Derivative Liabilities
Total gross derivatives	17,188	8,831
Other derivatives | Commodity and other | Cleared OTC
Derivative Assets
Total gross derivatives	0	0
Derivative Liabilities
Total gross derivatives	0	0
Other derivatives | Commodity and other | Exchange- Traded
Derivative Assets
Total gross derivatives	5,538	3,554
Derivative Liabilities
Total gross derivatives	$ 5,740	$ 3,359