Fair Value, Assets and Liabilities, Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets:
Trading debt securities	$ 86,672	$ 88,265
Available-for-sale debt securities	168,436	177,244
Gross derivative asset	58,611	45,876
Marketable equity securities	36,362	39,098
Equity securities	70,755	72,886
Liabilities:
Total derivative liabilities (gross)	(50,625)	(41,238)
Interest rate contracts [Member]
Assets:
Gross derivative asset	27,802	20,287
Liabilities:
Total derivative liabilities (gross)	(25,729)	(16,874)
Commodity contracts [Member]
Assets:
Gross derivative asset	13,121	5,597
Liabilities:
Total derivative liabilities (gross)	(5,536)	(2,296)
Equity contracts [Member]
Assets:
Gross derivative asset	9,039	13,625
Liabilities:
Total derivative liabilities (gross)	(10,916)	(15,816)
Foreign exchange contracts [Member]
Assets:
Gross derivative asset	8,617	6,335
Liabilities:
Total derivative liabilities (gross)	(8,417)	(6,221)
Credit contracts [Member]
Assets:
Gross derivative asset	32	32
Liabilities:
Total derivative liabilities (gross)	(27)	(31)
Securities of U.S. Treasury and federal agencies [Member]
Assets:
Available-for-sale debt securities	46,433	39,661
Collateralized loan obligations [Member]
Assets:
Available-for-sale debt securities	5,197	5,708
Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	116	71
Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	16,486	16,917
Federal agency mortgage-backed securities [Member]
Assets:
Available-for-sale debt securities	91,437	105,886
Non-agency mortgage-backed securities [Member]
Assets:
Available-for-sale debt securities	4,608	4,532
Other debt securities [Member]
Assets:
Available-for-sale debt securities	4,159	4,469
Fair value, recurring [Member]
Assets:
Loans held for sale	13,155	15,895
Gross derivative asset	66,308	52,908
Total assets prior to derivative netting	379,357	380,249
Fair value assets, Derivative netting	(38,943)	(31,430)
Total assets after derivative netting	340,414	348,819
Liabilities:
Total derivative liabilities (gross)	(56,204)	(45,956)
Short-sale and other trading liabilities	(26,382)	(20,685)
Total liabilities prior to derivative netting	(82,586)	(66,641)
Fair value liabilities, Derivative netting	40,705	36,532
Total liabilities after derivative netting	(41,881)	(30,109)
Fair value, recurring [Member] \| Residential mortgage [Member]
Assets:
Mortgage servicing rights	8,511	6,920
Fair value, recurring [Member] \| Interest rate contracts [Member]
Assets:
Gross derivative asset	30,538	22,538
Liabilities:
Total derivative liabilities (gross)	(27,709)	(17,803)
Fair value, recurring [Member] \| Commodity contracts [Member]
Assets:
Gross derivative asset	13,847	5,965
Liabilities:
Total derivative liabilities (gross)	(5,851)	(2,417)
Fair value, recurring [Member] \| Equity contracts [Member]
Assets:
Gross derivative asset	12,912	17,771
Liabilities:
Total derivative liabilities (gross)	(13,512)	(19,021)
Fair value, recurring [Member] \| Foreign exchange contracts [Member]
Assets:
Gross derivative asset	8,961	6,588
Liabilities:
Total derivative liabilities (gross)	(9,094)	(6,672)
Fair value, recurring [Member] \| Credit contracts [Member]
Assets:
Gross derivative asset	50	46
Liabilities:
Total derivative liabilities (gross)	(38)	(43)
Fair value, recurring [Member] \| Debt securities [Member]
Assets:
Trading debt securities	86,672	88,265
Available-for-sale debt securities	168,436	177,244
Fair value, recurring [Member] \| Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	33,023	29,856
Available-for-sale debt securities	46,433	39,661
Fair value, recurring [Member] \| Collateralized loan obligations [Member]
Assets:
Trading debt securities	862	866
Available-for-sale debt securities	5,197	5,708
Fair value, recurring [Member] \| Corporate debt securities [Member]
Assets:
Trading debt securities	11,114	10,005
Fair value, recurring [Member] \| Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	116	71
Fair value, recurring [Member] \| Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	16,486	16,917
Fair value, recurring [Member] \| Federal agency mortgage-backed securities [Member]
Assets:
Trading debt securities	32,788	40,350
Available-for-sale debt securities	91,437	105,886
Fair value, recurring [Member] \| Non-agency mortgage-backed securities [Member]
Assets:
Trading debt securities	1,522	1,542
Available-for-sale debt securities	4,608	4,532
Fair value, recurring [Member] \| Other debt securities [Member]
Assets:
Trading debt securities	7,363	5,646
Available-for-sale debt securities	4,159	4,469
Fair value, recurring [Member] \| Equity securities [Member]
Assets:
Equity securities	36,275	39,017
Fair value, recurring [Member] \| Marketable equity securities [Member]
Assets:
Marketable equity securities	25,766	30,054
Fair value, recurring [Member] \| Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	10,509	8,963
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets:
Loans held for sale	0	0
Gross derivative asset	4,026	6,462
Total assets prior to derivative netting	105,691	103,698
Liabilities:
Total derivative liabilities (gross)	(2,781)	(5,856)
Short-sale and other trading liabilities	(20,180)	(15,436)
Total liabilities prior to derivative netting	(22,961)	(21,292)
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Residential mortgage [Member]
Assets:
Mortgage servicing rights	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Interest rate contracts [Member]
Assets:
Gross derivative asset	241	52
Liabilities:
Total derivative liabilities (gross)	(131)	(28)
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Commodity contracts [Member]
Assets:
Gross derivative asset	0	0
Liabilities:
Total derivative liabilities (gross)	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity contracts [Member]
Assets:
Gross derivative asset	3,752	6,402
Liabilities:
Total derivative liabilities (gross)	(2,620)	(5,820)
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Foreign exchange contracts [Member]
Assets:
Gross derivative asset	33	8
Liabilities:
Total derivative liabilities (gross)	(30)	(8)
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Credit contracts [Member]
Assets:
Gross derivative asset	0	0
Liabilities:
Total derivative liabilities (gross)	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Debt securities [Member]
Assets:
Trading debt securities	29,706	27,607
Available-for-sale debt securities	46,433	39,661
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	29,706	27,607
Available-for-sale debt securities	46,433	39,661
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Collateralized loan obligations [Member]
Assets:
Trading debt securities	0	0
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate debt securities [Member]
Assets:
Trading debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Federal agency mortgage-backed securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Non-agency mortgage-backed securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other debt securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity securities [Member]
Assets:
Equity securities	25,526	29,968
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Marketable equity securities [Member]
Assets:
Marketable equity securities	25,526	29,968
Fair value, recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member]
Assets:
Loans held for sale	12,136	14,862
Gross derivative asset	61,281	44,153
Total assets prior to derivative netting	262,570	256,968
Liabilities:
Total derivative liabilities (gross)	(50,848)	(37,510)
Short-sale and other trading liabilities	(6,202)	(5,249)
Total liabilities prior to derivative netting	(57,050)	(42,759)
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Residential mortgage [Member]
Assets:
Mortgage servicing rights	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Interest rate contracts [Member]
Assets:
Gross derivative asset	30,251	22,296
Liabilities:
Total derivative liabilities (gross)	(27,356)	(17,712)
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Commodity contracts [Member]
Assets:
Gross derivative asset	13,531	5,902
Liabilities:
Total derivative liabilities (gross)	(5,543)	(2,351)
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Equity contracts [Member]
Assets:
Gross derivative asset	8,555	9,350
Liabilities:
Total derivative liabilities (gross)	(8,862)	(10,753)
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Foreign exchange contracts [Member]
Assets:
Gross derivative asset	8,912	6,573
Liabilities:
Total derivative liabilities (gross)	(9,051)	(6,654)
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Credit contracts [Member]
Assets:
Gross derivative asset	32	32
Liabilities:
Total derivative liabilities (gross)	(36)	(40)
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Debt securities [Member]
Assets:
Trading debt securities	56,765	60,417
Available-for-sale debt securities	121,665	137,397
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	3,317	2,249
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Collateralized loan obligations [Member]
Assets:
Trading debt securities	683	655
Available-for-sale debt securities	5,197	5,708
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Corporate debt securities [Member]
Assets:
Trading debt securities	11,096	9,987
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	116	71
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	16,354	16,832
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Federal agency mortgage-backed securities [Member]
Assets:
Trading debt securities	32,788	40,350
Available-for-sale debt securities	91,437	105,886
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Non-agency mortgage-backed securities [Member]
Assets:
Trading debt securities	1,518	1,531
Available-for-sale debt securities	4,597	4,522
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Other debt securities [Member]
Assets:
Trading debt securities	7,363	5,645
Available-for-sale debt securities	3,964	4,378
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Equity securities [Member]
Assets:
Equity securities	10,723	139
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Marketable equity securities [Member]
Assets:
Marketable equity securities	236	82
Fair value, recurring [Member] \| Fair value, inputs, level 2 [Member] \| Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	10,487	57
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member]
Assets:
Loans held for sale	1,019	1,033
Gross derivative asset	1,001	2,293
Total assets prior to derivative netting	11,096	19,583
Liabilities:
Total derivative liabilities (gross)	(2,575)	(2,590)
Short-sale and other trading liabilities	0	0
Total liabilities prior to derivative netting	(2,575)	(2,590)
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Residential mortgage [Member]
Assets:
Mortgage servicing rights	8,511	6,920
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Interest rate contracts [Member]
Assets:
Gross derivative asset	46	190
Liabilities:
Total derivative liabilities (gross)	(222)	(63)
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Commodity contracts [Member]
Assets:
Gross derivative asset	316	63
Liabilities:
Total derivative liabilities (gross)	(308)	(66)
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Equity contracts [Member]
Assets:
Gross derivative asset	605	2,019
Liabilities:
Total derivative liabilities (gross)	(2,030)	(2,448)
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Foreign exchange contracts [Member]
Assets:
Gross derivative asset	16	7
Liabilities:
Total derivative liabilities (gross)	(13)	(10)
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Credit contracts [Member]
Assets:
Gross derivative asset	18	14
Liabilities:
Total derivative liabilities (gross)	(2)	(3)
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Debt securities [Member]
Assets:
Trading debt securities	201	241
Available-for-sale debt securities	338	186
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	0	0
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Collateralized loan obligations [Member]
Assets:
Trading debt securities	179	211
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Corporate debt securities [Member]
Assets:
Trading debt securities	18	18
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	132	85
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Federal agency mortgage-backed securities [Member]
Assets:
Trading debt securities	0	0
Available-for-sale debt securities	0	0
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Non-agency mortgage-backed securities [Member]
Assets:
Trading debt securities	4	11
Available-for-sale debt securities	11	10
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Other debt securities [Member]
Assets:
Trading debt securities	0	1
Available-for-sale debt securities	195	91
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Equity securities [Member]
Assets:
Equity securities	26	8,910
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Marketable equity securities [Member]
Assets:
Marketable equity securities	4	4
Fair value, recurring [Member] \| Fair value, inputs, level 3 [Member] \| Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	22	8,906
Fair value, recurring [Member] \| Fair value measured at net asset value per share [Member] \| Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	$ 87	$ 81

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of liability associated with 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, and obligation to return cash collateral under master netting arrangements.

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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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Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or 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, and right to receive cash collateral under master netting arrangements.

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