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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables $ 556,122   $ 526,239      
Derivative netting adjustments (503,244)   (472,026)      
Net derivative receivables 52,878   54,213      
Trading assets 523,373   413,714      
Available-for-sale securities 276,357   230,394      
Loans 4,309   3,151      
Mortgage servicing rights 5,093 $ 5,957 6,130 $ 6,241 $ 6,202 $ 6,030
Gross derivative payables 532,949   501,888      
Derivative netting adjustments (491,470)   (460,119)      
Net derivative payables 41,479   41,769      
Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 334,556   268,704      
Derivative netting adjustments (308,068)   (245,490)      
Net derivative receivables 26,488   23,214      
Gross derivative payables 301,049   242,782      
Derivative netting adjustments (292,166)   (234,998)      
Net derivative payables 8,883   7,784      
Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 15,665   20,095      
Derivative netting adjustments (15,032)   (19,483)      
Net derivative receivables 633   612      
Gross derivative payables 17,231   20,276      
Derivative netting adjustments (14,975)   (18,609)      
Net derivative payables 2,256   1,667      
Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 144,100   167,685      
Derivative netting adjustments (133,437)   (154,235)      
Net derivative receivables 10,663   13,450      
Gross derivative payables 147,617   165,217      
Derivative netting adjustments (136,491)   (152,432)      
Net derivative payables 11,126   12,785      
Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 44,930   49,285      
Derivative netting adjustments (35,725)   (39,339)      
Net derivative receivables 9,205   9,946      
Gross derivative payables 47,698   51,195      
Derivative netting adjustments (36,521)   (41,034)      
Net derivative payables 11,177   10,161      
Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 16,871   20,470      
Derivative netting adjustments (10,982)   (13,479)      
Net derivative receivables 5,889   6,991      
Gross derivative payables 19,354   22,418      
Derivative netting adjustments (11,317)   (13,046)      
Net derivative payables 8,037   9,372      
Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 115,345   83,820      
Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 5,989   6,654      
U.S. Treasury and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 73,990   56,059      
Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 31,901   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 22,492   24,102      
Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 1,778   1,918      
Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 30,777          
Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 24,781   19,437      
U.S. government-sponsored enterprise obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 69,800   50,700      
Residential mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 16,600   13,200      
Commercial mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,800   2,300      
Residential conforming mortgage intended for sale to government agency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 9,900   7,600      
Fair Value Measured at Net Asset Value Per Share            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets 45   49      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Alternative investments, net asset value, fair value 746   747      
Other assets 701   698      
Recurring            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 13,982   13,235      
Securities borrowed 5,685   5,105      
Trading assets, debt and equity instruments 470,450   359,452      
Derivative netting adjustments (503,244)   (472,026)      
Net derivative receivables 52,878   54,213      
Trading assets 523,328   413,665      
Available-for-sale securities 276,357   230,394      
Loans 4,309   3,151      
Mortgage servicing rights 5,093   6,130      
Total assets measured at fair value on a recurring basis 837,597   680,612      
Deposits 32,924   23,217      
Federal funds purchased and securities loaned or sold under repurchase agreements 981   935      
Short-term borrowings 7,736   7,130      
Trading liabilities, Debt and equity instruments 106,160   103,004      
Derivative netting adjustments (491,470)   (460,119)      
Net derivative payables 41,479   41,769      
Trading liabilities 147,639   144,773      
Accounts payable and other liabilities 2,873   3,269      
Beneficial interests issued by consolidated VIEs 0   28      
Long-term debt 67,828   54,886      
Total liabilities measured at fair value on a recurring basis 259,981   234,238      
Recurring | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (308,068)   (245,490)      
Net derivative receivables 26,488   23,214      
Derivative netting adjustments (292,166)   (234,998)      
Net derivative payables 8,883   7,784      
Recurring | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (15,032)   (19,483)      
Net derivative receivables 633   612      
Derivative netting adjustments (14,975)   (18,609)      
Net derivative payables 2,256   1,667      
Recurring | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (133,437)   (154,235)      
Net derivative receivables 10,663   13,450      
Derivative netting adjustments (136,491)   (152,432)      
Net derivative payables 11,126   12,785      
Recurring | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (35,725)   (39,339)      
Net derivative receivables 9,205   9,946      
Derivative netting adjustments (36,521)   (41,034)      
Net derivative payables 11,177   10,161      
Recurring | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (10,982)   (13,479)      
Net derivative receivables 5,889   6,991      
Derivative netting adjustments (11,317)   (13,046)      
Net derivative payables 8,037   9,372      
Recurring | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 8,843   8,932      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Other assets 9,544   9,630      
Recurring | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 351,397   267,089      
Recurring | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 108,664   80,172      
Available-for-sale securities 115,345   83,820      
Recurring | Mortgage-backed securities, U.S. government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 104,803   76,798      
Available-for-sale securities 96,616   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 2,144   1,862      
Available-for-sale securities 12,740   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 1,717   1,512      
Available-for-sale securities 5,989   6,654      
Recurring | U.S. Treasury and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 98,214   59,179      
Available-for-sale securities 73,990   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 7,308   7,810      
Available-for-sale securities 31,901   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 1,492   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 66,383   55,089      
Available-for-sale securities 22,492   24,102      
Recurring | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 22,702   18,989      
Available-for-sale securities 1,778   1,918      
Recurring | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 43,958   41,753      
Recurring | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,676   2,883      
Recurring | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 24,781   19,437      
Recurring | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 5,996   7,260      
Recurring | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 98,837   71,833      
Recurring | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,031   7,037      
Recurring | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 13,185   13,493      
Recurring | U.S. government-sponsored enterprise obligations            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 153,600   92,300      
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 225,268   155,656      
Gross derivative receivables 3,699   1,453      
Trading assets 228,967   157,109      
Available-for-sale securities 88,859   71,372      
Loans 0   0      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 325,610   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 84,236   80,199      
Gross derivative payables 4,528   2,221      
Trading liabilities 88,764   82,420      
Accounts payable and other liabilities 2,583   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 91,347   85,483      
Recurring | Level 1 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,529   682      
Gross derivative payables 2,090   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 2,170   771      
Gross derivative payables 2,438   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 7,784   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 123,342   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. 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 and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 88,502   51,477      
Available-for-sale securities 73,990   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 34,840   27,878      
Available-for-sale securities 14,869   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 98,234   71,119      
Recurring | Level 1 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,692   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 13,982   13,235      
Securities borrowed 5,685   5,105      
Trading assets, debt and equity instruments 240,813   199,628      
Gross derivative receivables 546,208   518,969      
Trading assets 787,021   718,597      
Available-for-sale securities 187,498   159,021      
Loans 4,304   3,029      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 998,688   899,182      
Deposits 28,858   19,048      
Federal funds purchased and securities loaned or sold under repurchase agreements 981   935      
Short-term borrowings 5,684   5,607      
Trading liabilities, Debt and equity instruments 21,879   22,755      
Gross derivative payables 517,769   490,054      
Trading liabilities 539,648   512,809      
Accounts payable and other liabilities 198   196      
Beneficial interests issued by consolidated VIEs 0   27      
Long-term debt 45,965   35,468      
Total liabilities measured at fair value on a recurring basis 621,334   574,090      
Recurring | Level 2 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 331,329   266,380      
Gross derivative payables 296,717   239,576      
Recurring | Level 2 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 14,971   19,235      
Gross derivative payables 16,305   19,309      
Recurring | Level 2 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 141,248   166,238      
Gross derivative payables 144,304   163,549      
Recurring | Level 2 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 41,997   46,777      
Gross derivative payables 42,205   46,462      
Recurring | Level 2 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 16,663   20,339      
Gross derivative payables 18,238   21,158      
Recurring | Level 2 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 198   195      
Recurring | Level 2 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 224,144   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 107,996   79,548      
Available-for-sale securities 115,345   83,819      
Recurring | Level 2 | Mortgage-backed securities, U.S. government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 104,186   76,249      
Available-for-sale securities 96,616   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 2,102   1,798      
Available-for-sale securities 12,740   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 1,708   1,501      
Available-for-sale securities 5,989   6,654      
Recurring | Level 2 | U.S. Treasury and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 9,712   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 6,628   7,121      
Available-for-sale securities 31,901   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 1,492   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 31,353   27,056      
Available-for-sale securities 7,623   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 22,140   18,655      
Available-for-sale securities 1,778   1,918      
Recurring | Level 2 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 42,180   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 2,643   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 24,781   19,437      
Recurring | Level 2 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 5,996   7,260      
Recurring | Level 2 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 456   482      
Recurring | Level 2 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,339   1,855      
Recurring | Level 2 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 12,874   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 4,369   4,168      
Gross derivative receivables 6,215   5,817      
Trading assets 10,584   9,985      
Available-for-sale securities 0   1      
Loans 5   122      
Mortgage servicing rights 5,093   6,130      
Total assets measured at fair value on a recurring basis 16,543   17,165      
Deposits 4,066   4,169      
Federal funds purchased and securities loaned or sold under repurchase agreements 0   0      
Short-term borrowings 2,052   1,523      
Trading liabilities, Debt and equity instruments 45   50      
Gross derivative payables 10,652   9,613      
Trading liabilities 10,697   9,663      
Accounts payable and other liabilities 92   10      
Beneficial interests issued by consolidated VIEs 0   1      
Long-term debt 21,863   19,418      
Total liabilities measured at fair value on a recurring basis 38,770   34,784      
Recurring | Level 3 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,698   1,642      
Gross derivative payables 2,242   1,680      
Recurring | Level 3 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 694   860      
Gross derivative payables 926   967      
Recurring | Level 3 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 682   676      
Gross derivative payables 875   973      
Recurring | Level 3 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 2,933   2,508      
Gross derivative payables 5,493   4,733      
Recurring | Level 3 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 208   131      
Gross derivative payables 1,116   1,260      
Recurring | Level 3 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 861   927      
Recurring | Level 3 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,911   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 668   624      
Available-for-sale securities 0   1      
Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 617   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 42   64      
Available-for-sale securities 0   1      
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 9   11      
Available-for-sale securities 0   0      
Recurring | Level 3 | U.S. Treasury and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
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 680   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 190   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 562   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 1,778   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 33   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 147   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 $ 311   $ 301