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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables $ 622,398   $ 526,239      
Derivative netting adjustments (566,821)   (472,026)      
Net derivative receivables 55,577   54,213      
Trading assets 495,875   413,714      
Available-for-sale securities 353,421   230,394      
Loans 5,760   3,151      
Mortgage servicing rights 4,419 $ 5,093 6,130 $ 6,433 $ 6,241 $ 6,030
Gross derivative payables 598,219   501,888      
Derivative netting adjustments (550,429)   (460,119)      
Net derivative payables 47,790   41,769      
Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 375,933   268,704      
Derivative netting adjustments (347,426)   (245,490)      
Net derivative receivables 28,507   23,214      
Gross derivative payables 338,713   242,782      
Derivative netting adjustments (328,490)   (234,998)      
Net derivative payables 10,223   7,784      
Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 15,717   20,095      
Derivative netting adjustments (14,879)   (19,483)      
Net derivative receivables 838   612      
Gross derivative payables 17,062   20,276      
Derivative netting adjustments (14,903)   (18,609)      
Net derivative payables 2,159   1,667      
Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 163,132   167,685      
Derivative netting adjustments (150,451)   (154,235)      
Net derivative receivables 12,681   13,450      
Gross derivative payables 165,742   165,217      
Derivative netting adjustments (150,726)   (152,432)      
Net derivative payables 15,016   12,785      
Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 46,378   49,285      
Derivative netting adjustments (38,969)   (39,339)      
Net derivative receivables 7,409   9,946      
Gross derivative payables 50,891   51,195      
Derivative netting adjustments (40,288)   (41,034)      
Net derivative payables 10,603   10,161      
Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 21,238   20,470      
Derivative netting adjustments (15,096)   (13,479)      
Net derivative receivables 6,142   6,991      
Gross derivative payables 25,811   22,418      
Derivative netting adjustments (16,022)   (13,046)      
Net derivative payables 9,789   9,372      
Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 123,807   83,820      
Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 5,324   6,654      
U.S. Treasury, GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 141,529   56,059      
Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 31,064   37,723      
Certificates of deposit            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 74   75      
Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 22,158   24,102      
Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 1,634   1,918      
Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 33,155          
Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 27,908   19,437      
U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 78,800   50,700      
Fair Value Measured at Net Asset Value Per Share            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets 48   49      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Alternative investments, net asset value, fair value 714   747      
Other assets 666   698      
Recurring            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 13,705   13,235      
Securities borrowed 5,784   5,105      
Trading assets, debt and equity instruments 440,250   359,452      
Derivative netting adjustments (566,821)   (472,026)      
Net derivative receivables 55,577   54,213      
Trading assets 495,827   413,665      
Available-for-sale securities 353,421   230,394      
Loans 5,760   3,151      
Mortgage servicing rights 4,419   6,130      
Total assets measured at fair value on a recurring basis 887,166   680,612      
Deposits 29,355   23,217      
Federal funds purchased and securities loaned or sold under repurchase agreements 933   935      
Short-term borrowings 6,497   7,130      
Trading liabilities, Debt and equity instruments 90,553   103,004      
Derivative netting adjustments (550,429)   (460,119)      
Net derivative payables 47,790   41,769      
Trading liabilities 138,343   144,773      
Accounts payable and other liabilities 2,411   3,269      
Beneficial interests issued by consolidated VIEs 39   28      
Long-term debt 71,957   54,886      
Total liabilities measured at fair value on a recurring basis 249,535   234,238      
Recurring | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (347,426)   (245,490)      
Net derivative receivables 28,507   23,214      
Derivative netting adjustments (328,490)   (234,998)      
Net derivative payables 10,223   7,784      
Recurring | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (14,879)   (19,483)      
Net derivative receivables 838   612      
Derivative netting adjustments (14,903)   (18,609)      
Net derivative payables 2,159   1,667      
Recurring | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (150,451)   (154,235)      
Net derivative receivables 12,681   13,450      
Derivative netting adjustments (150,726)   (152,432)      
Net derivative payables 15,016   12,785      
Recurring | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (38,969)   (39,339)      
Net derivative receivables 7,409   9,946      
Derivative netting adjustments (40,288)   (41,034)      
Net derivative payables 10,603   10,161      
Recurring | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (15,096)   (13,479)      
Net derivative receivables 6,142   6,991      
Derivative netting adjustments (16,022)   (13,046)      
Net derivative payables 9,789   9,372      
Recurring | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 8,250   8,932      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Other assets 8,916   9,630      
Recurring | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 314,733   267,089      
Recurring | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 75,323   80,172      
Available-for-sale securities 123,807   83,820      
Recurring | Mortgage-backed securities, U.S. GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 71,428   76,798      
Available-for-sale securities 105,581   68,646      
Recurring | Mortgage-backed securities, Residential - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,277   1,862      
Available-for-sale securities 12,902   8,520      
Recurring | Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,618   1,512      
Available-for-sale securities 5,324   6,654      
Recurring | U.S. Treasury, GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 86,399   59,179      
Available-for-sale securities 141,529   56,059      
Recurring | Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 6,856   7,810      
Available-for-sale securities 31,064   37,723      
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,180   1,214      
Recurring | Certificates of deposit            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 74   75      
Recurring | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 74,942   55,089      
Available-for-sale securities 22,158   24,102      
Recurring | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 20,945   18,989      
Available-for-sale securities 1,634   1,918      
Recurring | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 45,054   41,753      
Recurring | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,034   2,883      
Recurring | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 27,908   19,437      
Recurring | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 5,247   7,260      
Recurring | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 101,248   71,833      
Recurring | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 10,765   7,037      
Recurring | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 13,504   13,493      
Recurring | U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 133,600   92,300      
Recurring | Residential mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 16,100   13,200      
Recurring | Commercial mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 4,200   2,300      
Recurring | Residential conforming mortgage intended for sale to U.S. GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 10,300   7,600      
Recurring | Level 1            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 0   0      
Securities borrowed 0   0      
Trading assets, debt and equity instruments 223,634   155,656      
Gross derivative receivables 4,993   1,453      
Trading assets 228,627   157,109      
Available-for-sale securities 155,133   71,372      
Loans 0   0      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 391,227   236,291      
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 66,515   80,199      
Gross derivative payables 4,789   2,221      
Trading liabilities 71,304   82,420      
Accounts payable and other liabilities 2,355   3,063      
Beneficial interests issued by consolidated VIEs 0   0      
Long-term debt 0   0      
Total liabilities measured at fair value on a recurring basis 73,659   85,483      
Recurring | Level 1 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,312   682      
Gross derivative payables 1,206   1,526      
Recurring | Level 1 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 0   0      
Gross derivative payables 0   0      
Recurring | Level 1 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 3,681   771      
Gross derivative payables 3,583   695      
Recurring | Level 1 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 0   0      
Gross derivative payables 0   0      
Recurring | Level 1 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 0   0      
Gross derivative payables 0   0      
Recurring | Level 1 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 7,467   7,810      
Recurring | Level 1 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 115,115   79,355      
Recurring | Level 1 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 0   0      
Available-for-sale securities 0   0      
Recurring | Level 1 | Mortgage-backed securities, U.S. GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 0   0      
Available-for-sale securities 0   0      
Recurring | Level 1 | Mortgage-backed securities, Residential - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
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            
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            
Trading assets, debt and equity instruments 76,953   51,477      
Available-for-sale securities 141,529   56,059      
Recurring | Level 1 | Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
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            
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            
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            
Trading assets, debt and equity instruments 38,162   27,878      
Available-for-sale securities 13,604   15,313      
Recurring | Level 1 | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
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            
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            
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            
Available-for-sale securities 0   0      
Recurring | Level 1 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 0   0      
Recurring | Level 1 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 100,829   71,119      
Recurring | Level 1 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,690   5,182      
Recurring | Level 1 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 0   0      
Recurring | Level 2            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 13,705   13,235      
Securities borrowed 5,784   5,105      
Trading assets, debt and equity instruments 212,233   199,628      
Gross derivative receivables 611,832   518,969      
Trading assets 824,065   718,597      
Available-for-sale securities 198,287   159,021      
Loans 5,759   3,029      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 1,047,637   899,182      
Deposits 25,719   19,048      
Federal funds purchased and securities loaned or sold under repurchase agreements 933   935      
Short-term borrowings 4,496   5,607      
Trading liabilities, Debt and equity instruments 23,970   22,755      
Gross derivative payables 582,865   490,054      
Trading liabilities 606,835   512,809      
Accounts payable and other liabilities 37   196      
Beneficial interests issued by consolidated VIEs 39   27      
Long-term debt 49,608   35,468      
Total liabilities measured at fair value on a recurring basis 687,667   574,090      
Recurring | Level 2 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 372,834   266,380      
Gross derivative payables 335,401   239,576      
Recurring | Level 2 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 15,072   19,235      
Gross derivative payables 16,100   19,309      
Recurring | Level 2 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 158,893   166,238      
Gross derivative payables 160,760   163,549      
Recurring | Level 2 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 44,064   46,777      
Gross derivative payables 45,109   46,462      
Recurring | Level 2 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 20,969   20,339      
Gross derivative payables 25,495   21,158      
Recurring | Level 2 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 37   195      
Recurring | Level 2 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 195,737   184,099      
Recurring | Level 2 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 74,483   79,548      
Available-for-sale securities 123,806   83,819      
Recurring | Level 2 | Mortgage-backed securities, U.S. GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 70,617   76,249      
Available-for-sale securities 105,581   68,646      
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,253   1,798      
Available-for-sale securities 12,901   8,519      
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,613   1,501      
Available-for-sale securities 5,324   6,654      
Recurring | Level 2 | U.S. Treasury, GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 9,446   7,702      
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            
Trading assets, debt and equity instruments 6,229   7,121      
Available-for-sale securities 31,064   37,723      
Recurring | Level 2 | Certificates of deposit, bankers’ acceptances and commercial paper            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,180   1,214      
Recurring | Level 2 | Certificates of deposit            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 74   75      
Recurring | Level 2 | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 36,634   27,056      
Available-for-sale securities 8,554   8,789      
Recurring | Level 2 | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 20,461   18,655      
Available-for-sale securities 1,634   1,918      
Recurring | Level 2 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 43,308   40,047      
Recurring | Level 2 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,996   2,756      
Recurring | Level 2 | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 27,908   19,437      
Recurring | Level 2 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 5,247   7,260      
Recurring | Level 2 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 249   482      
Recurring | Level 2 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,075   1,855      
Recurring | Level 2 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 13,172   13,192      
Recurring | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 0   0      
Securities borrowed 0   0      
Trading assets, debt and equity instruments 4,383   4,168      
Gross derivative receivables 5,573   5,817      
Trading assets 9,956   9,985      
Available-for-sale securities 1   1      
Loans 1   122      
Mortgage servicing rights 4,419   6,130      
Total assets measured at fair value on a recurring basis 15,123   17,165      
Deposits 3,636   4,169      
Federal funds purchased and securities loaned or sold under repurchase agreements 0   0      
Short-term borrowings 2,001   1,523      
Trading liabilities, Debt and equity instruments 68   50      
Gross derivative payables 10,565   9,613      
Trading liabilities 10,633   9,663      
Accounts payable and other liabilities 19   10      
Beneficial interests issued by consolidated VIEs 0   1      
Long-term debt 22,349   19,418      
Total liabilities measured at fair value on a recurring basis 38,638   34,784      
Recurring | Level 3 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,787   1,642      
Gross derivative payables 2,106   1,680      
Recurring | Level 3 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 645   860      
Gross derivative payables 962   967      
Recurring | Level 3 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 558   676      
Gross derivative payables 1,399   973      
Recurring | Level 3 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 2,314   2,508      
Gross derivative payables 5,782   4,733      
Recurring | Level 3 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 269   131      
Gross derivative payables 316   1,260      
Recurring | Level 3 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 746   927      
Recurring | Level 3 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,881   3,635      
Recurring | Level 3 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 840   624      
Available-for-sale securities 1   1      
Recurring | Level 3 | Mortgage-backed securities, U.S. GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 811   549      
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            
Trading assets, debt and equity instruments 24   64      
Available-for-sale securities 1   1      
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 5   11      
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            
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            
Trading assets, debt and equity instruments 627   689      
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            
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            
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            
Trading assets, debt and equity instruments 146   155      
Available-for-sale securities 0   0      
Recurring | Level 3 | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 484   334      
Available-for-sale securities 0   0      
Recurring | Level 3 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,746   1,706      
Recurring | Level 3 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 38   127      
Recurring | Level 3 | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 0   0      
Recurring | Level 3 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 0   0      
Recurring | Level 3 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 170   232      
Recurring | Level 3 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 0   0      
Recurring | Level 3 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments $ 332   $ 301