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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables $ 574,004   $ 707,554      
Derivative netting adjustments (503,293)   (627,924)      
Net derivative receivables 70,711   79,630      
Trading assets 520,588   503,126      
Available-for-sale securities 232,161   388,178      
Loans 61,776   44,474      
Mortgage servicing rights 4,549 $ 4,470 3,276 $ 3,080 $ 3,267 $ 4,699
Gross derivative payables 552,881   688,887      
Derivative netting adjustments (496,836)   (618,264)      
Net derivative payables 56,045   70,623      
Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 304,249   391,648      
Derivative netting adjustments (278,203)   (355,923)      
Net derivative receivables 26,046   35,725      
Gross derivative payables 270,175   353,987      
Derivative netting adjustments (260,985)   (340,975)      
Net derivative payables 9,190   13,012      
Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 10,104   13,345      
Derivative netting adjustments (9,156)   (12,665)      
Net derivative receivables 948   680      
Gross derivative payables 11,515   14,832      
Derivative netting adjustments (10,331)   (12,837)      
Net derivative payables 1,184   1,995      
Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 157,417   206,260      
Derivative netting adjustments (142,910)   (190,479)      
Net derivative receivables 14,507   15,781      
Gross derivative payables 156,751   215,926      
Derivative netting adjustments (143,036)   (194,493)      
Net derivative payables 13,715   21,433      
Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 73,104   74,798      
Derivative netting adjustments (56,243)   (54,125)      
Net derivative receivables 16,861   20,673      
Gross derivative payables 84,557   81,413      
Derivative netting adjustments (63,457)   (55,515)      
Net derivative payables 21,100   25,898      
Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 29,130   21,503      
Derivative netting adjustments (16,781)   (14,732)      
Net derivative receivables 12,349   6,771      
Gross derivative payables 29,883   22,729      
Derivative netting adjustments (19,027)   (14,444)      
Net derivative payables 10,856   8,285      
Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 82,123   126,390      
Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 2,471   2,856      
U.S. Treasury, GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 99,847   201,951      
Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 18,455   20,396      
Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 17,740   22,928      
Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 216   216      
Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 13,780          
Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 8,816   10,048      
U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 46,400   65,800      
Fair Value Measured at Net Asset Value Per Share            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets 56   52      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Alternative investments, net asset value, fair value 688   670      
Other assets 632   618      
Recurring            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 254,574   238,015      
Securities borrowed 69,988   52,983      
Trading assets, debt and equity instruments 449,821   423,444      
Derivative netting adjustments (503,293)   (627,924)      
Net derivative receivables 70,711   79,630      
Trading assets 520,532   503,074      
Available-for-sale securities 232,161   388,178      
Loans 61,776   44,474      
Mortgage servicing rights 4,549   3,276      
Total assets measured at fair value on a recurring basis 1,195,182   1,243,209      
Deposits 14,023   14,484      
Federal funds purchased and securities loaned or sold under repurchase agreements 175,817   155,735      
Short-term borrowings 20,002   16,893      
Trading liabilities, Debt and equity instruments 127,822   99,558      
Derivative netting adjustments (496,836)   (618,264)      
Net derivative payables 56,045   70,623      
Trading liabilities 183,867   170,181      
Accounts payable and other liabilities 45,571   3,476      
Beneficial interests issued by consolidated VIEs 84   41      
Long-term debt 75,733   76,817      
Total liabilities measured at fair value on a recurring basis 515,097   437,627      
Recurring | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (278,203)   (355,923)      
Net derivative receivables 26,046   35,725      
Derivative netting adjustments (260,985)   (340,975)      
Net derivative payables 9,190   13,012      
Recurring | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (9,156)   (12,665)      
Net derivative receivables 948   680      
Derivative netting adjustments (10,331)   (12,837)      
Net derivative payables 1,184   1,995      
Recurring | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (142,910)   (190,479)      
Net derivative receivables 14,507   15,781      
Derivative netting adjustments (143,036)   (194,493)      
Net derivative payables 13,715   21,433      
Recurring | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (56,243)   (54,125)      
Net derivative receivables 16,861   20,673      
Derivative netting adjustments (63,457)   (55,515)      
Net derivative payables 21,100   25,898      
Recurring | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (16,781)   (14,732)      
Net derivative receivables 12,349   6,771      
Derivative netting adjustments (19,027)   (14,444)      
Net derivative payables 10,856   8,285      
Recurring | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 51,602   13,209      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Other assets 52,234   13,827      
Recurring | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 265,803   294,496      
Recurring | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 38,568   72,340      
Available-for-sale securities 82,123   126,390      
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 34,710   68,844      
Available-for-sale securities 72,682   113,301      
Recurring | Mortgage-backed securities, Residential - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,194   2,166      
Available-for-sale securities 6,970   10,233      
Recurring | Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,664   1,330      
Available-for-sale securities 2,471   2,856      
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 84,931   115,259      
Available-for-sale securities 99,847   201,951      
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 6,879   7,192      
Available-for-sale securities 18,455   20,396      
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 2,394   1,230      
Recurring | Certificates of deposit            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 0   0      
Recurring | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 90,891   67,625      
Available-for-sale securities 17,740   22,928      
Recurring | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 31,140   21,524      
Available-for-sale securities 216   216      
Recurring | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 8,335   6,994      
Recurring | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,665   2,332      
Recurring | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 8,816   10,048      
Recurring | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 4,964   6,249      
Recurring | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 142,057   100,163      
Recurring | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 20,564   11,571      
Recurring | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 21,397   17,214      
Recurring | U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 68,500   117,600      
Recurring | Residential mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 29,800   15,100      
Recurring | Commercial mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,900   6,300      
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 15,400   8,400      
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 263,739   234,452      
Gross derivative receivables 1,083   2,464      
Trading assets 264,822   236,916      
Available-for-sale securities 108,745   215,093      
Loans 0   0      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 419,161   460,119      
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 98,290   82,669      
Gross derivative payables 1,143   2,628      
Trading liabilities 99,433   85,297      
Accounts payable and other liabilities 43,774   2,895      
Beneficial interests issued by consolidated VIEs 0   0      
Long-term debt 0   0      
Total liabilities measured at fair value on a recurring basis 143,207   88,192      
Recurring | Level 1 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 953   2,318      
Gross derivative payables 996   2,496      
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 130   146      
Gross derivative payables 147   132      
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 45,594   8,110      
Recurring | Level 1 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 114,330   131,035      
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   7      
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   7      
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 76,124   104,263      
Available-for-sale securities 99,847   201,951      
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 38,206   26,772      
Available-for-sale securities 8,898   13,135      
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 139,456   97,035      
Recurring | Level 1 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 9,953   6,382      
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 254,574   238,015      
Securities borrowed 69,988   52,983      
Trading assets, debt and equity instruments 183,482   186,369      
Gross derivative receivables 566,438   697,422      
Trading assets 749,920   883,791      
Available-for-sale securities 123,416   173,085      
Loans 60,042   42,169      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 1,263,430   1,394,604      
Deposits 11,339   11,571      
Federal funds purchased and securities loaned or sold under repurchase agreements 175,817   155,735      
Short-term borrowings 16,927   14,473      
Trading liabilities, Debt and equity instruments 29,496   16,838      
Gross derivative payables 538,530   673,598      
Trading liabilities 568,026   690,436      
Accounts payable and other liabilities 1,746   513      
Beneficial interests issued by consolidated VIEs 84   41      
Long-term debt 52,206   53,420      
Total liabilities measured at fair value on a recurring basis 826,145   926,189      
Recurring | Level 2 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 301,447   387,023      
Gross derivative payables 267,308   349,442      
Recurring | Level 2 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 9,561   12,721      
Gross derivative payables 10,955   13,984      
Recurring | Level 2 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 156,594   205,127      
Gross derivative payables 155,328   214,373      
Recurring | Level 2 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 70,075   71,279      
Gross derivative payables 76,592   74,032      
Recurring | Level 2 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 28,761   21,272      
Gross derivative payables 28,347   21,767      
Recurring | Level 2 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 5,490   4,561      
Recurring | Level 2 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 149,610   161,363      
Recurring | Level 2 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 38,213   71,860      
Available-for-sale securities 82,123   126,383      
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 34,381   68,395      
Available-for-sale securities 72,682   113,294      
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 2,178   2,138      
Available-for-sale securities 6,970   10,233      
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 1,654   1,327      
Available-for-sale securities 2,471   2,856      
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 8,807   10,996      
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 6,871   7,184      
Available-for-sale securities 18,455   20,396      
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 2,394   1,230      
Recurring | Level 2 | Certificates of deposit            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 0   0      
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 52,502   40,671      
Available-for-sale securities 8,842   9,793      
Recurring | Level 2 | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 30,653   21,017      
Available-for-sale securities 216   216      
Recurring | Level 2 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,540   6,101      
Recurring | Level 2 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,630   2,304      
Recurring | Level 2 | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 8,816   10,048      
Recurring | Level 2 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 4,964   6,249      
Recurring | Level 2 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,911   2,652      
Recurring | Level 2 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 10,611   5,189      
Recurring | Level 2 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 21,350   17,165      
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 2,600   2,623      
Gross derivative receivables 6,483   7,668      
Trading assets 9,083   10,291      
Available-for-sale securities 0   0      
Loans 1,734   2,305      
Mortgage servicing rights 4,549   3,276      
Total assets measured at fair value on a recurring basis 15,884   16,410      
Deposits 2,684   2,913      
Federal funds purchased and securities loaned or sold under repurchase agreements 0   0      
Short-term borrowings 3,075   2,420      
Trading liabilities, Debt and equity instruments 36   51      
Gross derivative payables 13,208   12,661      
Trading liabilities 13,244   12,712      
Accounts payable and other liabilities 51   68      
Beneficial interests issued by consolidated VIEs 0   0      
Long-term debt 23,527   23,397      
Total liabilities measured at fair value on a recurring basis 42,581   41,510      
Recurring | Level 3 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,849   2,307      
Gross derivative payables 1,871   2,049      
Recurring | Level 3 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 543   624      
Gross derivative payables 560   848      
Recurring | Level 3 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 693   987      
Gross derivative payables 1,276   1,421      
Recurring | Level 3 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 3,029   3,519      
Gross derivative payables 7,965   7,381      
Recurring | Level 3 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 369   231      
Gross derivative payables 1,536   962      
Recurring | Level 3 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 518   538      
Recurring | Level 3 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,863   2,098      
Recurring | Level 3 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 355   480      
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            
Trading assets, debt and equity instruments 329   449      
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 16   28      
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            
Trading assets, debt and equity instruments 10   3      
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 8   8      
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 183   182      
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 487   507      
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 795   893      
Recurring | Level 3 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 35   28      
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 690   476      
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 $ 47   $ 49