Fair Value Measurement - Recurring Basis (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		$ 707,554	$ 529,626
Derivative netting adjustments		(627,924)	(479,860)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		79,630	49,766
Trading assets	[1]	503,126	369,687
Available-for-sale securities		388,178	350,699
Loans		44,474	44,955
Mortgage servicing rights		3,276	4,699	$ 6,130	$ 6,030
Derivative payables, gross		688,887	512,128
Derivative netting adjustments		(618,264)	(468,420)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		70,623	43,708
Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		391,490	313,294
Derivative netting adjustments		(355,765)	(285,873)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		35,725	27,421
Derivative payables, gross		353,627	279,273
Derivative netting adjustments		(340,615)	(270,670)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		13,012	8,603
Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		13,503	14,876
Derivative netting adjustments		(12,823)	(14,175)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		680	701
Derivative payables, gross		15,192	15,121
Derivative netting adjustments		(13,197)	(13,469)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		1,995	1,652
Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		206,260	138,487
Derivative netting adjustments		(190,479)	(129,482)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		15,781	9,005
Derivative payables, gross		215,926	145,108
Derivative netting adjustments		(194,493)	(131,950)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		21,433	13,158
Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		74,798	45,727
Derivative netting adjustments		(54,125)	(39,250)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		20,673	6,477
Derivative payables, gross		81,413	52,741
Derivative netting adjustments		(55,515)	(40,204)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		25,898	12,537
Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		21,503	17,242
Derivative netting adjustments		(14,732)	(11,080)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		6,771	6,162
Derivative payables, gross		22,729	19,885
Derivative netting adjustments		(14,444)	(12,127)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		8,285	7,758
Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		126,390	128,295
Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		2,856	5,188
U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		201,951	139,436
Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		7,200	6,500
Available-for-sale securities		20,396	29,810
Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	77
Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		22,928	21,787
Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		216	845
Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		16,297
Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		10,048	24,991
US GSE obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		65,800	78,500
Fair Value Measured at Net Asset Value Per Share
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets		52	54
Fair value assets and liabilities measured on recurring basis - supplemental data
Alternative investments, net asset value, fair value		670	684
Other assets		618	630
Recurring
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements		238,015	14,561
Securities borrowed		52,983	6,237
Trading assets, debt and equity instruments		423,444	319,867
Derivative netting adjustments		(627,924)	(479,860)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		79,630	49,766
Trading assets		503,074	369,633
Available-for-sale securities		388,178	350,699
Loans		44,474	44,955
Mortgage servicing rights		3,276	4,699
Total assets measured at fair value on a recurring basis		1,243,209	802,830
Deposits		14,484	28,589
Federal funds purchased and securities loaned or sold under repurchase agreements		155,735	549
Short-term borrowings		16,893	5,920
Trading liabilities, Debt and equity instruments		99,558	75,569
Derivative netting adjustments		(618,264)	(468,420)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		70,623	43,708
Trading liabilities		170,181	119,277
Accounts payable and other liabilities		3,476	3,728
Beneficial interests issued by consolidated VIEs		41	36
Long-term debt		76,817	75,745
Total liabilities measured at fair value on a recurring basis		437,627	233,844
Recurring | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets		13,209	12,046
Fair value assets and liabilities measured on recurring basis - supplemental data
Other assets		13,827	12,676
Recurring | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments		(355,765)	(285,873)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		35,725	27,421
Derivative netting adjustments		(340,615)	(270,670)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		13,012	8,603
Recurring | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments		(12,823)	(14,175)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		680	701
Derivative netting adjustments		(13,197)	(13,469)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		1,995	1,652
Recurring | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments		(190,479)	(129,482)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		15,781	9,005
Derivative netting adjustments		(194,493)	(131,950)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		21,433	13,158
Recurring | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments		(54,125)	(39,250)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		20,673	6,477
Derivative netting adjustments		(55,515)	(40,204)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		25,898	12,537
Recurring | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments		(14,732)	(11,080)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables		6,771	6,162
Derivative netting adjustments		(14,444)	(12,127)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables		8,285	7,758
Recurring | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		294,496	226,192
Recurring | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		72,340	48,797
Available-for-sale securities		126,390	128,295
Recurring | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		68,844	45,307
Available-for-sale securities		113,301	110,117
Recurring | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		2,166	2,000
Available-for-sale securities		10,233	12,990
Recurring | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		1,330	1,490
Available-for-sale securities		2,856	5,188
Recurring | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		115,259	88,584
Available-for-sale securities		201,951	139,436
Recurring | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		7,192	6,478
Available-for-sale securities		20,396	29,810
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		1,230	252
Recurring | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	77
Recurring | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		67,625	53,924
Available-for-sale securities		22,928	21,787
Recurring | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		21,524	18,514
Available-for-sale securities		216	845
Recurring | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		6,994	7,013
Recurring | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		2,332	2,630
Recurring | Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		10,048	24,991
Recurring | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		6,249	5,458
Recurring | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		99,866	72,330
Recurring | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		11,571	7,217
Recurring | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		17,511	14,128
Recurring | US GSE obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		117,600	104,500
Recurring | Residential mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Loans		15,100	19,800
Recurring | Commercial mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Loans		6,300	8,200
Recurring | Residential conforming mortgage intended for sale to government agency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Loans		8,400	13,600
Recurring | Level 1
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements		0	0
Securities borrowed		0	0
Trading assets, debt and equity instruments		234,452	180,417
Derivative receivables, gross		2,464	838
Trading assets		236,916	181,255
Available-for-sale securities		236,104	152,402
Loans		0	0
Mortgage servicing rights		0	0
Total assets measured at fair value on a recurring basis		481,130	340,962
Deposits		0	0
Federal funds purchased and securities loaned or sold under repurchase agreements		0	0
Short-term borrowings		0	0
Trading liabilities, Debt and equity instruments		82,669	59,047
Derivative payables, gross		2,628	904
Trading liabilities		85,297	59,951
Accounts payable and other liabilities		2,895	3,231
Beneficial interests issued by consolidated VIEs		0	0
Long-term debt		0	0
Total liabilities measured at fair value on a recurring basis		88,192	63,182
Recurring | Level 1 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets		8,110	7,305
Recurring | Level 1 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		2,318	721
Derivative payables, gross		2,496	795
Recurring | Level 1 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		0	0
Derivative payables, gross		0	0
Recurring | Level 1 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		146	117
Derivative payables, gross		132	109
Recurring | Level 1 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		0	0
Derivative payables, gross		0	0
Recurring | Level 1 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		0	0
Derivative payables, gross		0	0
Recurring | Level 1 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		131,035	104,889
Recurring | Level 1 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		21,018	0
Recurring | Level 1 | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		21,018	0
Recurring | Level 1 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		0	0
Recurring | Level 1 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		0	0
Recurring | Level 1 | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		104,263	78,289
Available-for-sale securities		201,951	139,436
Recurring | Level 1 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		0	0
Recurring | Level 1 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Recurring | Level 1 | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	0
Recurring | Level 1 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		26,772	26,600
Available-for-sale securities		13,135	12,966
Recurring | Level 1 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		0	0
Recurring | Level 1 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Recurring | Level 1 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Recurring | Level 1 | Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	0
Recurring | Level 1 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	0
Recurring | Level 1 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		97,035	71,890
Recurring | Level 1 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		6,382	3,638
Recurring | Level 1 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Recurring | Level 2
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements		238,015	14,561
Securities borrowed		52,983	6,237
Trading assets, debt and equity instruments		186,369	136,765
Derivative receivables, gross		697,422	524,063
Trading assets		883,791	660,828
Available-for-sale securities		152,074	198,296
Loans		42,169	44,439
Mortgage servicing rights		0	0
Total assets measured at fair value on a recurring basis		1,373,593	928,185
Deposits		11,571	25,229
Federal funds purchased and securities loaned or sold under repurchase agreements		155,735	549
Short-term borrowings		14,473	4,246
Trading liabilities, Debt and equity instruments		16,838	16,481
Derivative payables, gross		673,598	502,010
Trading liabilities		690,436	518,491
Accounts payable and other liabilities		513	452
Beneficial interests issued by consolidated VIEs		41	36
Long-term debt		53,420	52,406
Total liabilities measured at fair value on a recurring basis		926,189	601,409
Recurring | Level 2 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets		4,561	3,824
Recurring | Level 2 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		386,865	311,173
Derivative payables, gross		349,082	276,746
Recurring | Level 2 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		12,879	14,252
Derivative payables, gross		14,344	14,358
Recurring | Level 2 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		205,127	137,938
Derivative payables, gross		214,373	143,960
Recurring | Level 2 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		71,279	43,642
Derivative payables, gross		74,032	47,261
Recurring | Level 2 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		21,272	17,058
Derivative payables, gross		21,767	19,685
Recurring | Level 2 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		161,363	119,046
Recurring | Level 2 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		71,860	47,973
Available-for-sale securities		105,372	128,294
Recurring | Level 2 | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		68,395	44,510
Available-for-sale securities		92,283	110,117
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		2,138	1,977
Available-for-sale securities		10,233	12,989
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		1,327	1,486
Available-for-sale securities		2,856	5,188
Recurring | Level 2 | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		10,996	10,295
Available-for-sale securities		0	0
Recurring | Level 2 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		7,184	6,468
Available-for-sale securities		20,396	29,810
Recurring | Level 2 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		1,230	252
Recurring | Level 2 | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	77
Recurring | Level 2 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		40,671	27,169
Available-for-sale securities		9,793	8,821
Recurring | Level 2 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		21,017	17,956
Available-for-sale securities		216	845
Recurring | Level 2 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		6,101	6,340
Recurring | Level 2 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		2,304	2,593
Recurring | Level 2 | Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		10,048	24,991
Recurring | Level 2 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		6,249	5,458
Recurring | Level 2 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		2,652	244
Recurring | Level 2 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		5,189	3,579
Recurring | Level 2 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		17,165	13,896
Recurring | Level 3
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements		0	0
Securities borrowed		0	0
Trading assets, debt and equity instruments		2,623	2,685
Derivative receivables, gross		7,668	4,725
Trading assets		10,291	7,410
Available-for-sale securities		0	1
Loans		2,305	516
Mortgage servicing rights		3,276	4,699
Total assets measured at fair value on a recurring basis		16,410	13,543
Deposits		2,913	3,360
Federal funds purchased and securities loaned or sold under repurchase agreements		0	0
Short-term borrowings		2,420	1,674
Trading liabilities, Debt and equity instruments		51	41
Derivative payables, gross		12,661	9,214
Trading liabilities		12,712	9,255
Accounts payable and other liabilities		68	45
Beneficial interests issued by consolidated VIEs		0	0
Long-term debt		23,397	23,339
Total liabilities measured at fair value on a recurring basis		41,510	37,673
Recurring | Level 3 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets		538	917
Recurring | Level 3 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		2,307	1,400
Derivative payables, gross		2,049	1,732
Recurring | Level 3 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		624	624
Derivative payables, gross		848	763
Recurring | Level 3 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		987	432
Derivative payables, gross		1,421	1,039
Recurring | Level 3 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		3,519	2,085
Derivative payables, gross		7,381	5,480
Recurring | Level 3 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross		231	184
Derivative payables, gross		962	200
Recurring | Level 3 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		2,098	2,257
Recurring | Level 3 | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		480	824
Available-for-sale securities		0	1
Recurring | Level 3 | Mortgage-backed securities, U.S. GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		449	797
Available-for-sale securities		0	0
Recurring | Level 3 | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		28	23
Available-for-sale securities		0	1
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		3	4
Available-for-sale securities		0	0
Recurring | Level 3 | U.S. Treasury, GSEs and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Available-for-sale securities		0	0
Recurring | Level 3 | Obligations of U.S. states and municipalities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		8	10
Available-for-sale securities		0	0
Recurring | Level 3 | Certificates of deposit, bankers’ acceptances and commercial paper
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Recurring | Level 3 | Certificates of deposit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	0
Recurring | Level 3 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		182	155
Available-for-sale securities		0	0
Recurring | Level 3 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		507	558
Available-for-sale securities		0	0
Recurring | Level 3 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		893	673
Recurring | Level 3 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		28	37
Recurring | Level 3 | Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	0
Recurring | Level 3 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities		0	0
Recurring | Level 3 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		179	196
Recurring | Level 3 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		0	0
Recurring | Level 3 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments		$ 346	$ 232

[1] In the third quarter of 2020, the Firm reclassified certain fair value option elected lending-related positions from trading assets to loans and other assets. Prior-period amounts have been revised to conform with the current presentation.