Derivatives, Notional or Contractual Amounts and Fair Values of Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives	$ 65,949	$ 65,682
Fair value asset derivatives, netting	(40,520)	(39,836)
Net amounts in consolidated balance sheet, assets	25,429	25,846
Fair value liability derivatives	54,071	58,065
Fair value liability derivatives, netting	(39,141)	(41,556)
Net amounts in consolidated balance sheet, liabilities	14,930	16,509
Interest rate contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives, netting	(21,206)	(21,968)
Net amounts in consolidated balance sheet, assets	10,934	14,095
Fair value liability derivatives, netting	(20,904)	(21,934)
Net amounts in consolidated balance sheet, liabilities	4,548	4,368
Commodity contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives, netting	(1,015)	(940)
Net amounts in consolidated balance sheet, assets	2,743	1,096
Fair value liability derivatives, netting	(753)	(819)
Net amounts in consolidated balance sheet, liabilities	769	724
Equity contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives, netting	(10,886)	(10,968)
Net amounts in consolidated balance sheet, assets	8,761	7,917
Fair value liability derivatives, netting	(11,868)	(12,283)
Net amounts in consolidated balance sheet, liabilities	6,515	9,723
Foreign exchange contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives, netting	(7,356)	(5,887)
Net amounts in consolidated balance sheet, assets	2,963	2,716
Fair value liability derivatives, netting	(5,581)	(6,481)
Net amounts in consolidated balance sheet, liabilities	3,082	1,675
Credit contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives, netting	(57)	(73)
Net amounts in consolidated balance sheet, assets	28	22
Fair value liability derivatives, netting	(35)	(39)
Net amounts in consolidated balance sheet, liabilities	16	19
Designated as hedging instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives	3,646	4,593
Fair value liability derivatives	1,000	1,396
Designated as hedging instrument [Member] \| Interest rate contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	169,631	184,090
Fair value asset derivatives	2,144	3,212
Fair value liability derivatives	449	789
Designated as hedging instrument [Member] \| Foreign exchange contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	44,756	47,331
Fair value asset derivatives	1,502	1,381
Fair value liability derivatives	551	607
Not designated as hedging instrument [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives	62,303	61,089
Fair value liability derivatives	53,071	56,669
Economic hedges [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives	3,020	2,066
Fair value liability derivatives	2,511	2,349
Economic hedges [Member] \| Interest rate contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	251,757	261,159
Fair value asset derivatives	939	341
Fair value liability derivatives	945	344
Economic hedges [Member] \| Equity contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	25,237	25,997
Fair value asset derivatives	1,364	1,363
Fair value liability derivatives	69	490
Economic hedges [Member] \| Foreign exchange contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	63,030	47,106
Fair value asset derivatives	686	331
Fair value liability derivatives	1,497	1,515
Economic hedges [Member] \| Credit contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	72	73
Fair value asset derivatives	31	31
Fair value liability derivatives	0	0
Customer accommodation trading and other derivatives [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Fair value asset derivatives	59,283	59,023
Fair value liability derivatives	50,560	54,320
Customer accommodation trading and other derivatives [Member] \| Interest rate contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	9,778,319	7,947,941
Fair value asset derivatives	29,057	32,510
Fair value liability derivatives	24,058	25,169
Customer accommodation trading and other derivatives [Member] \| Commodity contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	72,563	65,790
Fair value asset derivatives	3,758	2,036
Fair value liability derivatives	1,522	1,543
Customer accommodation trading and other derivatives [Member] \| Equity contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	299,633	280,195
Fair value asset derivatives	18,283	17,522
Fair value liability derivatives	18,314	21,516
Customer accommodation trading and other derivatives [Member] \| Foreign exchange contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	424,251	412,879
Fair value asset derivatives	8,131	6,891
Fair value liability derivatives	6,615	6,034
Customer accommodation trading and other derivatives [Member] \| Credit contracts [Member]
Notional Or Contractual Amounts And Fair Values For Derivatives [Abstract]
Notional or contractual amount	42,380	34,329
Fair value asset derivatives	54	64
Fair value liability derivatives	$ 51	$ 58

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Total Notional Or Contractual Amounts And Fair Values For Derivatives Abstract.

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