Fair Value Measurement - Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	$ 539,248	$ 639,593
Derivative netting adjustments	(484,384)	(568,713)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	54,864	70,880
Trading assets	540,607	453,799
Available-for-sale securities	201,704	205,857
Loans	38,851	42,079
Mortgage servicing rights	8,522	7,973	$ 5,494	$ 3,276
Derivative payables, gross	546,972	637,513
Derivative netting adjustments	(506,125)	(586,372)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	40,847	51,141
Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	250,691	300,415
Derivative netting adjustments	(224,367)	(271,996)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	26,324	28,419
Derivative payables, gross	240,482	290,291
Derivative netting adjustments	(228,586)	(274,321)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	11,896	15,970
Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	9,654	10,329
Derivative netting adjustments	(9,103)	(9,239)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	551	1,090
Derivative payables, gross	12,038	9,971
Derivative netting adjustments	(10,949)	(9,217)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	1,089	754
Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	205,775	241,579
Derivative netting adjustments	(187,756)	(218,214)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	18,019	23,365
Derivative payables, gross	212,263	251,521
Derivative netting adjustments	(199,643)	(232,665)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	12,620	18,856
Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	57,689	61,913
Derivative netting adjustments	(52,761)	(52,774)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	4,928	9,139
Derivative payables, gross	65,811	62,461
Derivative netting adjustments	(56,443)	(53,657)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	9,368	8,804
Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	15,439	25,357
Derivative netting adjustments	(10,397)	(16,490)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	5,042	8,867
Derivative payables, gross	16,378	23,269
Derivative netting adjustments	(10,504)	(16,512)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	5,874	6,757
Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	91,612	78,081
Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	2,803	1,958
U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	57,805	92,060
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	5,900	6,600
Available-for-sale securities	21,367	6,786
Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	21,282	19,696
Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	100	357
Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	9,538
Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	6,752	5,792
Fair Value Measured at Net Asset Value Per Share
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets	42	43
Fair value assets and liabilities measured on recurring basis - supplemental data
Alternative investments, net asset value, fair value	1,000	950
Other assets	984	907
Recurring
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements	259,813	311,883
Securities borrowed	70,086	70,041
Trading assets, debt and equity instruments	485,701	382,876
Derivative netting adjustments	(484,384)	(568,713)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	54,864	70,880
Trading assets	540,565	453,756
Available-for-sale securities	201,704	205,857
Loans	38,851	42,079
Mortgage servicing rights	8,522	7,973
Total assets measured at fair value on a recurring basis	1,130,863	1,105,603
Deposits	78,384	28,620
Federal funds purchased and securities loaned or sold under repurchase agreements	169,003	151,999
Short-term borrowings	20,042	15,792
Trading liabilities, Debt and equity instruments	139,581	126,835
Derivative netting adjustments	(506,125)	(586,372)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	40,847	51,141
Trading liabilities	180,428	177,976
Accounts payable and other liabilities	5,637	7,038
Beneficial interests issued by consolidated VIEs	1	5
Long-term debt	87,924	72,281
Total liabilities measured at fair value on a recurring basis	541,419	453,711
Recurring | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets	11,322	14,014
Fair value assets and liabilities measured on recurring basis - supplemental data
Other assets	12,306	14,921
Recurring | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments	(224,367)	(271,996)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	26,324	28,419
Derivative netting adjustments	(228,586)	(274,321)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	11,896	15,970
Recurring | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments	(9,103)	(9,239)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	551	1,090
Derivative netting adjustments	(10,949)	(9,217)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	1,089	754
Recurring | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments	(187,756)	(218,214)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	18,019	23,365
Derivative netting adjustments	(199,643)	(232,665)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	12,620	18,856
Recurring | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments	(52,761)	(52,774)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	4,928	9,139
Derivative netting adjustments	(56,443)	(53,657)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	9,368	8,804
Recurring | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative netting adjustments	(10,397)	(16,490)
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	5,042	8,867
Derivative netting adjustments	(10,504)	(16,512)
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	5,874	6,757
Recurring | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	353,198	253,188
Recurring | Total mortgage-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	77,898	72,879
Available-for-sale securities	91,612	78,081
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	74,598	68,921
Available-for-sale securities	85,170	71,503
Recurring | Mortgage-backed securities, Residential - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	1,926	2,503
Available-for-sale securities	3,639	4,620
Recurring | Mortgage-backed securities, Commercial - nonagency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	1,374	1,455
Available-for-sale securities	2,803	1,958
Recurring | U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	143,995	69,737
Available-for-sale securities	57,805	92,060
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	5,868	6,615
Available-for-sale securities	21,367	6,786
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	756	2,009
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	80,582	66,797
Available-for-sale securities	21,282	19,696
Recurring | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	33,338	26,089
Available-for-sale securities	100	357
Recurring | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	8,556	6,503
Recurring | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	2,205	2,559
Recurring | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	108,732	85,208
Recurring | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	5,791	26,270
Recurring | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	17,980	18,210
Recurring | Asset-backed securities, collateralized loan obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	6,752	5,792
Recurring | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	2,786	3,085
Recurring | US GSE obligations
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	78,500	73,800
Recurring | Residential mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	10,200	9,700
Recurring | Commercial mortgage
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	6,000	6,800
Recurring | Residential conforming mortgage intended for sale to government agency
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	2,900	2,400
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	269,248	171,482
Derivative receivables, gross	2,964	3,559
Trading assets	272,212	175,041
Available-for-sale securities	70,778	102,654
Loans	0	0
Mortgage servicing rights	0	0
Total assets measured at fair value on a recurring basis	349,625	285,239
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	107,292	98,719
Derivative payables, gross	4,556	2,803
Trading liabilities	111,848	101,522
Accounts payable and other liabilities	3,968	5,702
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	0	0
Total liabilities measured at fair value on a recurring basis	115,816	107,224
Recurring | Level 1 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets	6,635	7,544
Recurring | Level 1 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	2,815	3,390
Derivative payables, gross	4,409	2,643
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	149	169
Derivative payables, gross	147	160
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	158,843	79,404
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	0	3
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	0	3
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 and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	133,997	61,191
Available-for-sale securities	57,683	92,060
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 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	24,846	18,213
Available-for-sale securities	13,095	10,591
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 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	107,926	82,483
Recurring | Level 1 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	2,479	9,595
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 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 2
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Federal funds sold and securities purchased under resale agreements	259,813	311,883
Securities borrowed	70,086	70,041
Trading assets, debt and equity instruments	214,080	208,485
Derivative receivables, gross	527,360	625,352
Trading assets	741,440	833,837
Available-for-sale securities	130,926	102,964
Loans	35,772	40,661
Mortgage servicing rights	0	0
Total assets measured at fair value on a recurring basis	1,241,966	1,365,451
Deposits	76,551	26,458
Federal funds purchased and securities loaned or sold under repurchase agreements	169,003	151,999
Short-term borrowings	18,284	14,391
Trading liabilities, Debt and equity instruments	32,252	28,032
Derivative payables, gross	531,640	624,701
Trading liabilities	563,892	652,733
Accounts payable and other liabilities	1,617	1,283
Beneficial interests issued by consolidated VIEs	1	5
Long-term debt	60,198	48,189
Total liabilities measured at fair value on a recurring basis	889,546	895,058
Recurring | Level 2 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets	3,929	6,065
Recurring | Level 2 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	243,578	292,956
Derivative payables, gross	232,277	284,280
Recurring | Level 2 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	8,644	9,722
Derivative payables, gross	11,293	9,377
Recurring | Level 2 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	204,737	240,207
Derivative payables, gross	211,289	250,647
Recurring | Level 2 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	55,167	57,485
Derivative payables, gross	60,887	57,649
Recurring | Level 2 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	15,234	24,982
Derivative payables, gross	15,894	22,748
Recurring | Level 2 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	192,217	171,606
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	77,123	72,108
Available-for-sale securities	91,612	78,078
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	73,840	68,162
Available-for-sale securities	85,170	71,500
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	1,921	2,498
Available-for-sale securities	3,639	4,620
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	1,362	1,448
Available-for-sale securities	2,803	1,958
Recurring | Level 2 | U.S. Treasury and government agencies
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	9,998	8,546
Available-for-sale securities	122	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	5,858	6,608
Available-for-sale securities	21,367	6,786
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	756	2,009
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	55,557	48,429
Available-for-sale securities	8,187	9,105
Recurring | Level 2 | Corporate debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	32,854	25,626
Available-for-sale securities	100	118
Recurring | Level 2 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	7,872	5,744
Recurring | Level 2 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	2,199	2,536
Recurring | Level 2 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	679	2,060
Recurring | Level 2 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	3,305	16,673
Recurring | Level 2 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	17,879	18,146
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	6,752	5,792
Recurring | Level 2 | Asset-backed securities, other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	2,786	3,085
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	2,373	2,909
Derivative receivables, gross	8,924	10,682
Trading assets	11,297	13,591
Available-for-sale securities	0	239
Loans	3,079	1,418
Mortgage servicing rights	8,522	7,973
Total assets measured at fair value on a recurring basis	23,656	23,626
Deposits	1,833	2,162
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Short-term borrowings	1,758	1,401
Trading liabilities, Debt and equity instruments	37	84
Derivative payables, gross	10,776	10,009
Trading liabilities	10,813	10,093
Accounts payable and other liabilities	52	53
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	27,726	24,092
Total liabilities measured at fair value on a recurring basis	42,182	37,801
Recurring | Level 3 | Other assets
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Other assets	758	405
Recurring | Level 3 | Interest rate
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	4,298	4,069
Derivative payables, gross	3,796	3,368
Recurring | Level 3 | Credit
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	1,010	607
Derivative payables, gross	745	594
Recurring | Level 3 | Foreign exchange
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	889	1,203
Derivative payables, gross	827	714
Recurring | Level 3 | Equity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	2,522	4,428
Derivative payables, gross	4,924	4,812
Recurring | Level 3 | Commodity
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative receivables, gross	205	375
Derivative payables, gross	484	521
Recurring | Level 3 | Total debt instruments
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	2,138	2,178
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	775	771
Available-for-sale securities	0	0
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	758	759
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	5	5
Available-for-sale securities	0	0
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	12	7
Available-for-sale securities	0	0
Recurring | Level 3 | U.S. Treasury 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	10	7
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 | Non-U.S. government debt securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	179	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	484	463
Available-for-sale securities	0	239
Recurring | Level 3 | Loans
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	684	759
Recurring | Level 3 | Asset-backed securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	6	23
Recurring | Level 3 | Equity securities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	127	665
Recurring | Level 3 | Physical commodities
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	7	2
Recurring | Level 3 | Other
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Trading assets, debt and equity instruments	101	64
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