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Fair Value Measurement - Recurring Basis (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables $ 526,239,000,000 $ 559,553,000,000    
Derivative netting adjustments (472,026,000,000) (503,030,000,000)    
Net derivative receivables 54,213,000,000 56,523,000,000    
Trading assets 413,714,000,000 381,844,000,000    
Available-for-sale securities 230,394,000,000 201,678,000,000    
Available-for-sale securities   202,225,000,000    
Loans 3,151,000,000 2,508,000,000    
Mortgage servicing rights 6,130,000,000 6,030,000,000 $ 6,096,000,000 $ 6,608,000,000
Derivative payables, gross 501,888,000,000 530,806,000,000    
Derivative netting adjustments (460,119,000,000) (493,029,000,000)    
Derivative payables, net 41,769,000,000 37,777,000,000    
Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 268,704,000,000 315,992,000,000    
Derivative netting adjustments (245,490,000,000) (291,319,000,000)    
Net derivative receivables 23,214,000,000 24,673,000,000    
Derivative payables, gross 242,782,000,000 284,436,000,000    
Derivative netting adjustments (234,998,000,000) (277,306,000,000)    
Derivative payables, net 7,784,000,000 7,129,000,000    
Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 20,095,000,000 23,205,000,000    
Derivative netting adjustments (19,483,000,000) (22,335,000,000)    
Net derivative receivables 612,000,000 869,000,000    
Derivative payables, gross 20,276,000,000 23,252,000,000    
Derivative netting adjustments (18,609,000,000) (21,954,000,000)    
Derivative payables, net 1,667,000,000 1,299,000,000    
Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 167,685,000,000 160,231,000,000    
Derivative netting adjustments (154,235,000,000) (144,081,000,000)    
Net derivative receivables 13,450,000,000 16,151,000,000    
Derivative payables, gross 165,217,000,000 155,822,000,000    
Derivative netting adjustments (152,432,000,000) (143,349,000,000)    
Derivative payables, net 12,785,000,000 12,473,000,000    
Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 49,285,000,000 40,040,000,000    
Derivative netting adjustments (39,339,000,000) (32,158,000,000)    
Net derivative receivables 9,946,000,000 7,882,000,000    
Derivative payables, gross 51,195,000,000 45,395,000,000    
Derivative netting adjustments (41,034,000,000) (36,203,000,000)    
Derivative payables, net 10,161,000,000 9,192,000,000    
Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 20,470,000,000 20,085,000,000    
Derivative netting adjustments (13,479,000,000) (13,137,000,000)    
Net derivative receivables 6,991,000,000 6,948,000,000    
Derivative payables, gross 22,418,000,000 21,901,000,000    
Derivative netting adjustments (13,046,000,000) (14,217,000,000)    
Derivative payables, net 9,372,000,000 7,684,000,000    
Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 83,820,000,000 86,672,000,000    
Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 6,654,000,000 5,025,000,000    
U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 56,059,000,000 22,745,000,000    
Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 7,800,000,000 9,800,000,000    
Available-for-sale securities 37,723,000,000 32,338,000,000    
Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 75,000,000 59,000,000    
Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 24,102,000,000 27,294,000,000    
Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 1,918,000,000 2,757,000,000    
Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 26,697,000,000      
Asset-backed securities, collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 19,437,000,000 20,996,000,000    
US government-sponsored and enterprises obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 50,700,000,000 45,800,000,000    
Residential mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 13,200,000,000 11,400,000,000    
Commercial mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 2,300,000,000 4,200,000,000    
Residential conforming mortgage intended for sale to government agency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 7,600,000,000 5,700,000,000    
Reverse mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 836,000,000    
Fair Value Measured at Net Asset Value Per Share        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 49,000,000 54,000,000    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 747,000,000 779,000,000    
Other assets 698,000,000 725,000,000    
Recurring        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Federal funds sold and securities purchased under resale agreements 13,235,000,000 14,732,000,000    
Securities borrowed 5,105,000,000 3,049,000,000    
Trading assets 359,452,000,000 325,267,000,000    
Derivative netting adjustments (472,026,000,000) (503,030,000,000)    
Net derivative receivables 54,213,000,000 56,523,000,000    
Trading assets 413,665,000,000 381,790,000,000    
Available-for-sale securities 230,394,000,000      
Available-for-sale securities   202,225,000,000    
Loans 3,151,000,000 2,508,000,000    
Mortgage servicing rights 6,130,000,000 6,030,000,000    
Total assets measured at fair value on a recurring basis 680,612,000,000 625,737,000,000    
Deposits 23,217,000,000 21,321,000,000    
Federal funds purchased and securities loaned or sold under repurchase agreements 935,000,000 697,000,000    
Short-term borrowings 7,130,000,000 9,191,000,000    
Trading liabilities, Debt and equity instruments 103,004,000,000 85,886,000,000    
Derivative netting adjustments (460,119,000,000) (493,029,000,000)    
Derivative payables, net 41,769,000,000 37,777,000,000    
Trading liabilities 144,773,000,000 123,663,000,000    
Accounts payable and other liabilities 3,269,000,000 9,208,000,000    
Beneficial interests issued by consolidated VIEs 28,000,000 45,000,000    
Long-term debt 54,886,000,000 47,519,000,000    
Total liabilities measured at fair value on a recurring basis 234,238,000,000 211,644,000,000    
Recurring | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 8,932,000,000 15,403,000,000    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Other assets 9,630,000,000 16,128,000,000    
Recurring | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (245,490,000,000) (291,319,000,000)    
Net derivative receivables 23,214,000,000 24,673,000,000    
Derivative netting adjustments (234,998,000,000) (277,306,000,000)    
Derivative payables, net 7,784,000,000 7,129,000,000    
Recurring | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (19,483,000,000) (22,335,000,000)    
Net derivative receivables 612,000,000 869,000,000    
Derivative netting adjustments (18,609,000,000) (21,954,000,000)    
Derivative payables, net 1,667,000,000 1,299,000,000    
Recurring | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (154,235,000,000) (144,081,000,000)    
Net derivative receivables 13,450,000,000 16,151,000,000    
Derivative netting adjustments (152,432,000,000) (143,349,000,000)    
Derivative payables, net 12,785,000,000 12,473,000,000    
Recurring | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (39,339,000,000) (32,158,000,000)    
Net derivative receivables 9,946,000,000 7,882,000,000    
Derivative netting adjustments (41,034,000,000) (36,203,000,000)    
Derivative payables, net 10,161,000,000 9,192,000,000    
Recurring | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (13,479,000,000) (13,137,000,000)    
Net derivative receivables 6,991,000,000 6,948,000,000    
Derivative netting adjustments (13,046,000,000) (14,217,000,000)    
Derivative payables, net 9,372,000,000 7,684,000,000    
Recurring | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 267,089,000,000 216,296,000,000    
Recurring | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 80,172,000,000 45,373,000,000    
Available-for-sale securities 83,820,000,000      
Available-for-sale securities   86,672,000,000    
Recurring | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 76,798,000,000 41,822,000,000    
Available-for-sale securities 68,646,000,000      
Available-for-sale securities   70,280,000,000    
Recurring | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,862,000,000 1,895,000,000    
Available-for-sale securities 8,520,000,000      
Available-for-sale securities   11,367,000,000    
Recurring | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,512,000,000 1,656,000,000    
Available-for-sale securities 6,654,000,000      
Available-for-sale securities   5,025,000,000    
Recurring | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 59,179,000,000 37,234,000,000    
Available-for-sale securities 56,059,000,000      
Available-for-sale securities   22,745,000,000    
Recurring | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 7,810,000,000 9,811,000,000    
Available-for-sale securities 37,723,000,000      
Available-for-sale securities   32,338,000,000    
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,214,000,000 226,000,000    
Recurring | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 75,000,000      
Available-for-sale securities   59,000,000    
Recurring | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 55,089,000,000 57,796,000,000    
Available-for-sale securities 24,102,000,000      
Available-for-sale securities   27,294,000,000    
Recurring | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 18,989,000,000 24,458,000,000    
Available-for-sale securities 1,918,000,000      
Available-for-sale securities   2,757,000,000    
Recurring | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 41,753,000,000 37,961,000,000    
Recurring | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 2,883,000,000 3,437,000,000    
Recurring | Asset-backed securities, collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 19,437,000,000      
Available-for-sale securities   20,996,000,000    
Recurring | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 7,260,000,000      
Available-for-sale securities   8,817,000,000    
Recurring | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 71,833,000,000 87,838,000,000    
Available-for-sale securities   547,000,000    
Recurring | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 7,037,000,000 6,246,000,000    
Recurring | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 13,493,000,000 14,887,000,000    
Recurring | US government-sponsored and enterprises obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 92,300,000,000 78,000,000,000.0    
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 155,656,000,000 151,915,000,000    
Gross derivative receivables 1,453,000,000 1,022,000,000    
Trading assets 157,109,000,000 152,937,000,000    
Available-for-sale securities 71,372,000,000      
Available-for-sale securities   41,432,000,000    
Loans 0 0    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 236,291,000,000 208,164,000,000    
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 80,199,000,000 64,664,000,000    
Derivative payables, gross 2,221,000,000 964,000,000    
Trading liabilities 82,420,000,000 65,628,000,000    
Accounts payable and other liabilities 3,063,000,000 9,074,000,000    
Beneficial interests issued by consolidated VIEs 0 0    
Long-term debt 0 0    
Total liabilities measured at fair value on a recurring basis 85,483,000,000 74,702,000,000    
Recurring | Level 1 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 7,810,000,000 13,795,000,000    
Recurring | Level 1 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 682,000,000 181,000,000    
Derivative payables, gross 1,526,000,000 170,000,000    
Recurring | Level 1 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 771,000,000 841,000,000    
Derivative payables, gross 695,000,000 794,000,000    
Recurring | Level 1 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 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 79,355,000,000 59,645,000,000    
Recurring | Level 1 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 1 | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 1 | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 1 | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 1 | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 51,477,000,000 30,758,000,000    
Available-for-sale securities 56,059,000,000      
Available-for-sale securities   22,745,000,000    
Recurring | Level 1 | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0      
Available-for-sale securities   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 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      
Available-for-sale securities   0    
Recurring | Level 1 | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 27,878,000,000 28,887,000,000    
Available-for-sale securities 15,313,000,000      
Available-for-sale securities   18,140,000,000    
Recurring | Level 1 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 1 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Recurring | Level 1 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 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      
Available-for-sale securities   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      
Available-for-sale securities   0    
Recurring | Level 1 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 71,119,000,000 87,346,000,000    
Available-for-sale securities   547,000,000    
Recurring | Level 1 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 5,182,000,000 4,924,000,000    
Recurring | Level 1 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 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 13,235,000,000 14,732,000,000    
Securities borrowed 5,105,000,000 3,049,000,000    
Trading assets 199,628,000,000 167,982,000,000    
Gross derivative receivables 518,969,000,000 552,533,000,000    
Trading assets 718,597,000,000 720,515,000,000    
Available-for-sale securities 159,021,000,000      
Available-for-sale securities   160,516,000,000    
Loans 3,029,000,000 2,232,000,000    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 899,182,000,000 901,387,000,000    
Deposits 19,048,000,000 17,179,000,000    
Federal funds purchased and securities loaned or sold under repurchase agreements 935,000,000 697,000,000    
Short-term borrowings 5,607,000,000 7,526,000,000    
Trading liabilities, Debt and equity instruments 22,755,000,000 21,183,000,000    
Derivative payables, gross 490,054,000,000 519,594,000,000    
Trading liabilities 512,809,000,000 540,777,000,000    
Accounts payable and other liabilities 196,000,000 121,000,000    
Beneficial interests issued by consolidated VIEs 27,000,000 6,000,000    
Long-term debt 35,468,000,000 31,394,000,000    
Total liabilities measured at fair value on a recurring basis 574,090,000,000 597,700,000,000    
Recurring | Level 2 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 195,000,000 343,000,000    
Recurring | Level 2 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 266,380,000,000 314,107,000,000    
Derivative payables, gross 239,576,000,000 282,825,000,000    
Recurring | Level 2 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 19,235,000,000 21,995,000,000    
Derivative payables, gross 19,309,000,000 22,009,000,000    
Recurring | Level 2 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 166,238,000,000 158,834,000,000    
Derivative payables, gross 163,549,000,000 154,075,000,000    
Recurring | Level 2 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 46,777,000,000 37,722,000,000    
Derivative payables, gross 46,462,000,000 39,668,000,000    
Recurring | Level 2 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 20,339,000,000 19,875,000,000    
Derivative payables, gross 21,158,000,000 21,017,000,000    
Recurring | Level 2 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 184,099,000,000 152,266,000,000    
Recurring | Level 2 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 79,548,000,000 44,995,000,000    
Available-for-sale securities 83,819,000,000      
Available-for-sale securities   86,671,000,000    
Recurring | Level 2 | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 76,249,000,000 41,515,000,000    
Available-for-sale securities 68,646,000,000      
Available-for-sale securities   70,280,000,000    
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,798,000,000 1,835,000,000    
Available-for-sale securities 8,519,000,000      
Available-for-sale securities   11,366,000,000    
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,501,000,000 1,645,000,000    
Available-for-sale securities 6,654,000,000      
Available-for-sale securities   5,025,000,000    
Recurring | Level 2 | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 7,702,000,000 6,475,000,000    
Available-for-sale securities 0      
Available-for-sale securities   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 7,121,000,000 9,067,000,000    
Available-for-sale securities 37,723,000,000      
Available-for-sale securities   32,338,000,000    
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 1,214,000,000 226,000,000    
Recurring | Level 2 | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 75,000,000      
Available-for-sale securities   59,000,000    
Recurring | Level 2 | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 27,056,000,000 28,831,000,000    
Available-for-sale securities 8,789,000,000      
Available-for-sale securities   9,154,000,000    
Recurring | Level 2 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 18,655,000,000 24,146,000,000    
Available-for-sale securities 1,918,000,000      
Available-for-sale securities   2,757,000,000    
Recurring | Level 2 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 40,047,000,000 35,242,000,000    
Recurring | Level 2 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 2,756,000,000 3,284,000,000    
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 19,437,000,000      
Available-for-sale securities   20,720,000,000    
Recurring | Level 2 | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 7,260,000,000      
Available-for-sale securities   8,817,000,000    
Recurring | Level 2 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 482,000,000 197,000,000    
Available-for-sale securities   0    
Recurring | Level 2 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,855,000,000 1,322,000,000    
Recurring | Level 2 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 13,192,000,000 14,197,000,000    
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 4,168,000,000 5,370,000,000    
Gross derivative receivables 5,817,000,000 5,998,000,000    
Trading assets 9,985,000,000 11,368,000,000    
Available-for-sale securities 1,000,000      
Available-for-sale securities   277,000,000    
Loans 122,000,000 276,000,000    
Mortgage servicing rights 6,130,000,000 6,030,000,000    
Total assets measured at fair value on a recurring basis 17,165,000,000 19,216,000,000    
Deposits 4,169,000,000 4,142,000,000    
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0    
Short-term borrowings 1,523,000,000 1,665,000,000    
Trading liabilities, Debt and equity instruments 50,000,000 39,000,000    
Derivative payables, gross 9,613,000,000 10,248,000,000    
Trading liabilities 9,663,000,000 10,287,000,000    
Accounts payable and other liabilities 10,000,000 13,000,000    
Beneficial interests issued by consolidated VIEs 1,000,000 39,000,000    
Long-term debt 19,418,000,000 16,125,000,000    
Total liabilities measured at fair value on a recurring basis 34,784,000,000 32,271,000,000    
Recurring | Level 3 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 927,000,000 1,265,000,000    
Recurring | Level 3 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 1,642,000,000 1,704,000,000    
Derivative payables, gross 1,680,000,000 1,440,000,000    
Recurring | Level 3 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 860,000,000 1,209,000,000    
Derivative payables, gross 967,000,000 1,244,000,000    
Recurring | Level 3 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 676,000,000 557,000,000    
Derivative payables, gross 973,000,000 953,000,000    
Recurring | Level 3 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 2,508,000,000 2,318,000,000    
Derivative payables, gross 4,733,000,000 5,727,000,000    
Recurring | Level 3 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 131,000,000 210,000,000    
Derivative payables, gross 1,260,000,000 884,000,000    
Recurring | Level 3 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 3,635,000,000 4,385,000,000    
Recurring | Level 3 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 624,000,000 378,000,000    
Available-for-sale securities 1,000,000      
Available-for-sale securities   1,000,000    
Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 549,000,000 307,000,000    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 3 | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 64,000,000 60,000,000    
Available-for-sale securities 1,000,000      
Available-for-sale securities   1,000,000    
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 11,000,000 11,000,000    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 3 | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 1,000,000    
Available-for-sale securities 0      
Available-for-sale securities   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 689,000,000 744,000,000    
Available-for-sale securities 0      
Available-for-sale securities   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 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      
Available-for-sale securities   0    
Recurring | Level 3 | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 155,000,000 78,000,000    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 3 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 334,000,000 312,000,000    
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 3 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,706,000,000 2,719,000,000    
Recurring | Level 3 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 127,000,000 153,000,000    
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      
Available-for-sale securities   276,000,000    
Recurring | Level 3 | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 0      
Available-for-sale securities   0    
Recurring | Level 3 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 232,000,000 295,000,000    
Available-for-sale securities   0    
Recurring | Level 3 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Recurring | Level 3 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets $ 301,000,000 $ 690,000,000