Fair Value, Assets and Liabilities, Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets:
Trading debt securities	$ 85,766	$ 88,265
Available-for-sale debt securities	115,835	177,244
Gross derivative asset	88,751	45,876
Marketable equity securities	24,698	39,098
Equity securities	59,560	72,886
Liabilities:
Total derivative liabilities (gross)	(84,263)	(41,238)
Interest rate contracts [Member]
Assets:
Gross derivative asset	42,696	20,287
Liabilities:
Total derivative liabilities (gross)	(43,426)	(16,874)
Commodity contracts [Member]
Assets:
Gross derivative asset	9,718	5,597
Liabilities:
Total derivative liabilities (gross)	(5,011)	(2,296)
Equity contracts [Member]
Assets:
Gross derivative asset	12,840	13,625
Liabilities:
Total derivative liabilities (gross)	(8,862)	(15,816)
Foreign exchange contracts [Member]
Assets:
Gross derivative asset	23,460	6,335
Liabilities:
Total derivative liabilities (gross)	(26,938)	(6,221)
Credit contracts [Member]
Assets:
Gross derivative asset	37	32
Liabilities:
Total derivative liabilities (gross)	(26)	(31)
Securities of U.S. Treasury and federal agencies [Member]
Assets:
Available-for-sale debt securities	44,730	39,661
Collateralized loan obligations [Member]
Assets:
Available-for-sale debt securities	4,134	5,708
Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	162	71
Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	10,666	16,917
Federal agency mortgage-backed securities [Member]
Assets:
Available-for-sale debt securities	50,351	105,886
Non-agency mortgage-backed securities [Member]
Assets:
Available-for-sale debt securities	3,426	4,532
Other debt securities [Member]
Assets:
Available-for-sale debt securities	2,366	4,469
Fair value, recurring [Member]
Assets:
Loans held for sale	6,125	15,895
Gross derivative asset	95,779	52,908
Total assets prior to derivative netting	338,031	380,249
Fair value assets, Derivative netting	(66,526)	(31,430)
Total assets after derivative netting	271,505	348,819
Liabilities:
Total derivative liabilities (gross)	(91,238)	(45,956)
Short-sale and other trading liabilities	(26,972)	(20,685)
Total liabilities prior to derivative netting	(118,210)	(66,641)
Fair value liabilities, Derivative netting	67,838	36,532
Total liabilities after derivative netting	(50,372)	(30,109)
Fair value, recurring [Member] | Residential mortgage [Member]
Assets:
Mortgage servicing rights	9,828	6,920
Fair value, recurring [Member] | Interest rate contracts [Member]
Assets:
Gross derivative asset	45,365	22,538
Liabilities:
Total derivative liabilities (gross)	(47,148)	(17,803)
Fair value, recurring [Member] | Commodity contracts [Member]
Assets:
Gross derivative asset	10,056	5,965
Liabilities:
Total derivative liabilities (gross)	(5,477)	(2,417)
Fair value, recurring [Member] | Equity contracts [Member]
Assets:
Gross derivative asset	15,721	17,771
Liabilities:
Total derivative liabilities (gross)	(10,520)	(19,021)
Fair value, recurring [Member] | Foreign exchange contracts [Member]
Assets:
Gross derivative asset	24,575	6,588
Liabilities:
Total derivative liabilities (gross)	(28,058)	(6,672)
Fair value, recurring [Member] | Credit contracts [Member]
Assets:
Gross derivative asset	62	46
Liabilities:
Total derivative liabilities (gross)	(35)	(43)
Fair value, recurring [Member] | Debt securities [Member]
Assets:
Trading debt securities	85,766	88,265
Available-for-sale debt securities	115,835	177,244
Fair value, recurring [Member] | Securities of U.S. Treasury and federal agencies [Member]
Assets:
Trading debt securities	34,185	29,856
Available-for-sale debt securities	44,730	39,661
Fair value, recurring [Member] | Collateralized loan obligations [Member]
Assets:
Trading debt securities	827	866
Available-for-sale debt securities	4,134	5,708
Fair value, recurring [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities	10,169	10,005
Fair value, recurring [Member] | Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	162	71
Fair value, recurring [Member] | Securities of U.S. states and political subdivisions [Member]
Assets:
Available-for-sale debt securities	10,666	16,917
Fair value, recurring [Member] | Federal agency mortgage-backed securities [Member]
Assets:
Trading debt securities	32,921	40,350
Available-for-sale debt securities	50,351	105,886
Fair value, recurring [Member] | Non-agency mortgage-backed securities [Member]
Assets:
Trading debt securities	1,409	1,542
Available-for-sale debt securities	3,426	4,532
Fair value, recurring [Member] | Other debt securities [Member]
Assets:
Trading debt securities	6,255	5,646
Available-for-sale debt securities	2,366	4,469
Fair value, recurring [Member] | Equity securities [Member]
Assets:
Equity securities	24,698	39,017
Fair value, recurring [Member] | Marketable equity securities [Member]
Assets:
Marketable equity securities	16,317	30,054
Fair value, recurring [Member] | Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	8,381	8,963
Fair value, recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Loans held for sale	0	0
Gross derivative asset	6,075	6,462
Total assets prior to derivative netting	96,314	103,698
Liabilities:
Total derivative liabilities (gross)	(3,946)	(5,856)
Short-sale and other trading liabilities	(20,592)	(15,436)
Total liabilities prior to derivative netting	(24,538)	(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	508	52
Liabilities:
Total derivative liabilities (gross)	(309)	(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	5,472	6,402
Liabilities:
Total derivative liabilities (gross)	(3,550)	(5,820)
Fair value, recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign exchange contracts [Member]
Assets:
Gross derivative asset	95	8
Liabilities:
Total derivative liabilities (gross)	(87)	(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	29,417	27,607
Available-for-sale debt securities	44,730	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	29,417	27,607
Available-for-sale debt securities	44,730	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	16,092	29,968
Fair value, recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable equity securities [Member]
Assets:
Marketable equity securities	16,092	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	5,051	14,862
Gross derivative asset	88,609	44,153
Total assets prior to derivative netting	228,807	256,968
Liabilities:
Total derivative liabilities (gross)	(82,787)	(37,510)
Short-sale and other trading liabilities	(6,380)	(5,249)
Total liabilities prior to derivative netting	(89,167)	(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	44,681	22,296
Liabilities:
Total derivative liabilities (gross)	(44,193)	(17,712)
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Commodity contracts [Member]
Assets:
Gross derivative asset	9,811	5,902
Liabilities:
Total derivative liabilities (gross)	(5,357)	(2,351)
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Equity contracts [Member]
Assets:
Gross derivative asset	9,683	9,350
Liabilities:
Total derivative liabilities (gross)	(5,261)	(10,753)
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Foreign exchange contracts [Member]
Assets:
Gross derivative asset	24,390	6,573
Liabilities:
Total derivative liabilities (gross)	(27,943)	(6,654)
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Credit contracts [Member]
Assets:
Gross derivative asset	44	32
Liabilities:
Total derivative liabilities (gross)	(33)	(40)
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Debt securities [Member]
Assets:
Trading debt securities	56,167	60,417
Available-for-sale debt securities	70,392	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	4,768	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	660	655
Available-for-sale debt securities	4,134	5,708
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Corporate debt securities [Member]
Assets:
Trading debt securities	10,154	9,987
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Non-U.S. government securities [Member]
Assets:
Available-for-sale debt securities	162	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	10,127	16,832
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Federal agency mortgage-backed securities [Member]
Assets:
Trading debt securities	32,921	40,350
Available-for-sale debt securities	50,351	105,886
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Non-agency mortgage-backed securities [Member]
Assets:
Trading debt securities	1,409	1,531
Available-for-sale debt securities	3,426	4,522
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Other debt securities [Member]
Assets:
Trading debt securities	6,255	5,645
Available-for-sale debt securities	2,192	4,378
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Equity securities [Member]
Assets:
Equity securities	8,588	139
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Marketable equity securities [Member]
Assets:
Marketable equity securities	222	82
Fair value, recurring [Member] | Fair value, inputs, level 2 [Member] | Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	8,366	57
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member]
Assets:
Loans held for sale	1,074	1,033
Gross derivative asset	1,095	2,293
Total assets prior to derivative netting	12,910	19,583
Liabilities:
Total derivative liabilities (gross)	(4,505)	(2,590)
Short-sale and other trading liabilities	0	0
Total liabilities prior to derivative netting	(4,505)	(2,590)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Residential mortgage [Member]
Assets:
Mortgage servicing rights	9,828	6,920
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Interest rate contracts [Member]
Assets:
Gross derivative asset	176	190
Liabilities:
Total derivative liabilities (gross)	(2,646)	(63)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Commodity contracts [Member]
Assets:
Gross derivative asset	245	63
Liabilities:
Total derivative liabilities (gross)	(120)	(66)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity contracts [Member]
Assets:
Gross derivative asset	566	2,019
Liabilities:
Total derivative liabilities (gross)	(1,709)	(2,448)
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Foreign exchange contracts [Member]
Assets:
Gross derivative asset	90	7
Liabilities:
Total derivative liabilities (gross)	(28)	(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	182	241
Available-for-sale debt securities	713	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	167	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	15	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	539	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	0	11
Available-for-sale debt securities	0	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	174	91
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Equity securities [Member]
Assets:
Equity securities	18	8,910
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Marketable equity securities [Member]
Assets:
Marketable equity securities	3	4
Fair value, recurring [Member] | Fair value, inputs, level 3 [Member] | Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities	$ 15	8,906
Fair value, recurring [Member] | Fair value measured at net asset value per share [Member] | Nonmarketable equity securities [Member]
Assets:
Nonmarketable equity securities		$ 81