Derivative Instruments and Hedging Activities - Fair Values of Derivative Contracts (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative Assets
Total gross derivatives	$ 480,230	$ 337,291
Counterparty netting	(356,873)	(254,430)
Cash collateral netting	(57,107)	(44,707)
Total in Trading assets	66,250	38,154
Financial instruments collateral	(28,876)	(10,457)
Net amounts	37,374	27,697
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	8,565	6,725
Derivative Liabilities
Total gross derivatives	462,623	333,504
Amounts offset against counterparty netting	(356,873)	(254,430)
Amounts offset against cash collateral netting	(57,488)	(44,506)
Total in Trading liabilities	48,262	34,568
Amounts not offset against financial instruments collateral	(5,826)	(5,913)
Net amounts	42,436	28,655
Net amounts for which master netting or collateral agreements are not in place or may not be legally enforceable	8,279	6,194
Designated as accounting hedges
Derivative Assets
Total gross derivatives	523	792
Derivative Liabilities
Total gross derivatives	487	194
Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	54	595
Derivative Liabilities
Total gross derivatives	428	87
Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	469	197
Derivative Liabilities
Total gross derivatives	59	107
Not designated as accounting hedges
Derivative Assets
Total gross derivatives	479,707	336,499
Derivative Liabilities
Total gross derivatives	462,136	333,310
Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	114	15
Derivative Liabilities
Total gross derivatives	239	429
Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	192,478	154,970
Derivative Liabilities
Total gross derivatives	182,767	147,115
Other derivatives | Credit
Derivative Assets
Total gross derivatives	10,654	8,935
Derivative Liabilities
Total gross derivatives	10,192	9,072
Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	167,775	74,534
Derivative Liabilities
Total gross derivatives	159,570	73,088
Other derivatives | Equity
Derivative Assets
Total gross derivatives	61,676	70,332
Derivative Liabilities
Total gross derivatives	69,805	80,678
Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	47,010	27,713
Derivative Liabilities
Total gross derivatives	39,563	22,928
Bilateral OTC
Derivative Assets
Total gross derivatives	389,738	278,447
Counterparty netting	(270,565)	(201,729)
Cash collateral netting	(55,266)	(43,495)
Total in Trading assets	63,907	33,223
Financial instruments collateral	(28,876)	(10,457)
Net amounts	35,031	22,766
Derivative Liabilities
Total gross derivatives	367,215	275,175
Amounts offset against counterparty netting	(270,565)	(201,729)
Amounts offset against cash collateral netting	(56,300)	(43,305)
Total in Trading liabilities	40,350	30,141
Amounts not offset against financial instruments collateral	(2,927)	(5,866)
Net amounts	37,423	24,275
Bilateral OTC | Designated as accounting hedges
Derivative Assets
Total gross derivatives	385	785
Derivative Liabilities
Total gross derivatives	483	143
Bilateral OTC | Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	53	594
Derivative Liabilities
Total gross derivatives	427	86
Bilateral OTC | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	332	191
Derivative Liabilities
Total gross derivatives	56	57
Bilateral OTC | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	389,353	277,662
Derivative Liabilities
Total gross derivatives	366,732	275,032
Bilateral OTC | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	2	0
Derivative Liabilities
Total gross derivatives	8	17
Bilateral OTC | Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	158,740	147,585
Derivative Liabilities
Total gross derivatives	147,347	140,770
Bilateral OTC | Other derivatives | Credit
Derivative Assets
Total gross derivatives	7,627	5,749
Derivative Liabilities
Total gross derivatives	7,057	5,609
Bilateral OTC | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	163,229	73,276
Derivative Liabilities
Total gross derivatives	155,524	71,851
Bilateral OTC | Other derivatives | Equity
Derivative Assets
Total gross derivatives	25,922	28,877
Derivative Liabilities
Total gross derivatives	31,341	39,597
Bilateral OTC | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	33,833	22,175
Derivative Liabilities
Total gross derivatives	25,455	17,188
Cleared OTC
Derivative Assets
Total gross derivatives	39,417	11,429
Counterparty netting	(37,449)	(9,818)
Cash collateral netting	(1,841)	(1,212)
Total in Trading assets	127	399
Financial instruments collateral	0	0
Net amounts	127	399
Derivative Liabilities
Total gross derivatives	41,821	11,234
Amounts offset against counterparty netting	(37,449)	(9,818)
Amounts offset against cash collateral netting	(1,188)	(1,201)
Total in Trading liabilities	3,184	215
Amounts not offset against financial instruments collateral	0	(8)
Net amounts	3,184	207
Cleared OTC | Designated as accounting hedges
Derivative Assets
Total gross derivatives	138	7
Derivative Liabilities
Total gross derivatives	4	51
Cleared OTC | Designated as accounting hedges | Interest rate
Derivative Assets
Total gross derivatives	1	1
Derivative Liabilities
Total gross derivatives	1	1
Cleared OTC | Designated as accounting hedges | Foreign exchange
Derivative Assets
Total gross derivatives	137	6
Derivative Liabilities
Total gross derivatives	3	50
Cleared OTC | Not designated as accounting hedges
Derivative Assets
Total gross derivatives	39,279	11,422
Derivative Liabilities
Total gross derivatives	41,817	11,183
Cleared OTC | Economic hedges of loans | Credit
Derivative Assets
Total gross derivatives	112	15
Derivative Liabilities
Total gross derivatives	231	412
Cleared OTC | Other derivatives | Interest rate
Derivative Assets
Total gross derivatives	31,664	7,002
Derivative Liabilities
Total gross derivatives	34,480	6,112
Cleared OTC | Other derivatives | Credit
Derivative Assets
Total gross derivatives	3,027	3,186
Derivative Liabilities
Total gross derivatives	3,135	3,463
Cleared OTC | Other derivatives | Foreign exchange
Derivative Assets
Total gross derivatives	4,476	1,219
Derivative Liabilities
Total gross derivatives	3,971	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	51,075	47,415
Counterparty netting	(48,859)	(42,883)
Cash collateral netting	0	0
Total in Trading assets	2,216	4,532
Financial instruments collateral	0	0
Net amounts	2,216	4,532
Derivative Liabilities
Total gross derivatives	53,587	47,095
Amounts offset against counterparty netting	(48,859)	(42,883)
Amounts offset against cash collateral netting	0	0
Total in Trading liabilities	4,728	4,212
Amounts not offset against financial instruments collateral	(2,899)	(39)
Net amounts	1,829	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	51,075	47,415
Derivative Liabilities
Total gross derivatives	53,587	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	2,074	383
Derivative Liabilities
Total gross derivatives	940	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	70	39
Derivative Liabilities
Total gross derivatives	75	41
Exchange- Traded | Other derivatives | Equity
Derivative Assets
Total gross derivatives	35,754	41,455
Derivative Liabilities
Total gross derivatives	38,464	41,081
Exchange- Traded | Other derivatives | Commodity and other
Derivative Assets
Total gross derivatives	13,177	5,538
Derivative Liabilities
Total gross derivatives	$ 14,108	$ 5,740