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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables $ 653,506   $ 545,287      
Derivative netting adjustments (572,189)   (488,206)      
Net derivative receivables 81,317   57,081      
Trading assets 465,577   433,575      
Available-for-sale securities 222,069   308,525      
Loans 47,056   58,820      
Mortgage servicing rights 7,439 $ 7,294 5,494 $ 4,549 $ 4,470 $ 3,276
Gross derivative payables 627,529   535,044      
Derivative netting adjustments (575,112)   (484,928)      
Net derivative payables 52,417   50,116      
Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 253,144   270,585      
Derivative netting adjustments (231,214)   (248,611)      
Net derivative receivables 21,930   21,974      
Gross derivative payables 237,212   240,731      
Derivative netting adjustments (225,687)   (232,537)      
Net derivative payables 11,525   8,194      
Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 13,578   9,839      
Derivative netting adjustments (11,971)   (8,808)      
Net derivative receivables 1,607   1,031      
Gross derivative payables 11,323   10,912      
Derivative netting adjustments (10,433)   (10,032)      
Net derivative payables 890   880      
Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 261,854   169,579      
Derivative netting adjustments (233,688)   (156,954)      
Net derivative receivables 28,166   12,625      
Gross derivative payables 259,286   175,746      
Derivative netting adjustments (240,045)   (161,649)      
Net derivative payables 19,241   14,097      
Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 76,181   68,631      
Derivative netting adjustments (66,004)   (58,650)      
Net derivative receivables 10,177   9,981      
Gross derivative payables 76,719   79,727      
Derivative netting adjustments (66,555)   (62,494)      
Net derivative payables 10,164   17,233      
Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 48,749   26,653      
Derivative netting adjustments (29,312)   (15,183)      
Net derivative receivables 19,437   11,470      
Gross derivative payables 42,989   27,928      
Derivative netting adjustments (32,392)   (18,216)      
Net derivative payables 10,597   9,712      
Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 71,317   83,562      
Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 2,153   4,949      
U.S. Treasury, GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 109,984   177,463      
Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 10,133   15,860      
Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 15,808   16,209      
Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 319   321      
Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 14,508          
Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 10,972   9,662      
Fair Value Measured at Net Asset Value Per Share            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets 45   51      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Alternative investments, net asset value, fair value 856   801      
Other assets 811   750      
Recurring            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 319,188   252,720      
Securities borrowed 73,995   81,463      
Trading assets, debt and equity instruments 384,215   376,443      
Derivative netting adjustments (572,189)   (488,206)      
Net derivative receivables 81,317   57,081      
Trading assets 465,532   433,524      
Available-for-sale securities 222,069   308,525      
Loans 47,056   58,820      
Mortgage servicing rights 7,439   5,494      
Total assets measured at fair value on a recurring basis 1,153,408   1,154,549      
Deposits 13,270   11,333      
Federal funds purchased and securities loaned or sold under repurchase agreements 156,340   126,435      
Short-term borrowings 16,879   20,015      
Trading liabilities, Debt and equity instruments 137,891   114,577      
Derivative netting adjustments (575,112)   (484,928)      
Net derivative payables 52,417   50,116      
Trading liabilities 190,308   164,693      
Accounts payable and other liabilities 9,753   5,651      
Beneficial interests issued by consolidated VIEs 5   12      
Long-term debt 66,062   74,934      
Total liabilities measured at fair value on a recurring basis 452,617   403,073      
Recurring | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (231,214)   (248,611)      
Net derivative receivables 21,930   21,974      
Derivative netting adjustments (225,687)   (232,537)      
Net derivative payables 11,525   8,194      
Recurring | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (11,971)   (8,808)      
Net derivative receivables 1,607   1,031      
Derivative netting adjustments (10,433)   (10,032)      
Net derivative payables 890   880      
Recurring | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (233,688)   (156,954)      
Net derivative receivables 28,166   12,625      
Derivative netting adjustments (240,045)   (161,649)      
Net derivative payables 19,241   14,097      
Recurring | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (66,004)   (58,650)      
Net derivative receivables 10,177   9,981      
Derivative netting adjustments (66,555)   (62,494)      
Net derivative payables 10,164   17,233      
Recurring | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (29,312)   (15,183)      
Net derivative receivables 19,437   11,470      
Derivative netting adjustments (32,392)   (18,216)      
Net derivative payables 10,597   9,712      
Recurring | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 18,129   14,003      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Other assets 18,940   14,753      
Recurring | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 255,237   235,981      
Recurring | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 54,830   43,111      
Available-for-sale securities 71,317   83,562      
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 50,969   39,209      
Available-for-sale securities 63,689   72,543      
Recurring | Mortgage-backed securities, Residential - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,205   2,386      
Available-for-sale securities 5,475   6,070      
Recurring | Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,656   1,516      
Available-for-sale securities 2,153   4,949      
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 74,416   77,708      
Available-for-sale securities 109,984   177,463      
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 6,945   7,075      
Available-for-sale securities 10,133   15,860      
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 677   852      
Recurring | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 81,323   71,644      
Available-for-sale securities 15,808   16,209      
Recurring | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 26,517   24,823      
Available-for-sale securities 319   321      
Recurring | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,798   8,074      
Recurring | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,731   2,694      
Recurring | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 10,972   9,662      
Recurring | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 3,536   5,448      
Recurring | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 87,135   89,307      
Recurring | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 22,895   26,145      
Recurring | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 18,948   25,010      
Recurring | U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 70,000   73,900      
Recurring | Residential mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 13,500   26,200      
Recurring | Commercial mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,700   8,200      
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 4,400   13,600      
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 185,003   187,770      
Gross derivative receivables 3,936   1,206      
Trading assets 188,939   188,976      
Available-for-sale securities 116,581   182,897      
Loans 0   0      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 315,489   381,431      
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 104,871   87,831      
Gross derivative payables 2,946   1,104      
Trading liabilities 107,817   88,935      
Accounts payable and other liabilities 6,752   5,115      
Beneficial interests issued by consolidated VIEs 0   0      
Long-term debt 0   0      
Total liabilities measured at fair value on a recurring basis 114,569   94,050      
Recurring | Level 1 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 3,682   1,072      
Gross derivative payables 2,706   981      
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 254   134      
Gross derivative payables 240   123      
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 9,969   9,558      
Recurring | Level 1 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 97,545   95,509      
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   4      
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   4      
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 64,403   68,527      
Available-for-sale securities 109,984   177,463      
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 | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 33,142   26,982      
Available-for-sale securities 6,597   5,430      
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 84,045   86,904      
Recurring | Level 1 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 3,413   5,357      
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 319,187   252,720      
Securities borrowed 73,995   81,463      
Trading assets, debt and equity instruments 195,931   186,394      
Gross derivative receivables 640,615   536,775      
Trading assets 836,546   723,169      
Available-for-sale securities 105,302   125,467      
Loans 45,036   56,887      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 1,387,818   1,243,845      
Deposits 11,238   9,016      
Federal funds purchased and securities loaned or sold under repurchase agreements 156,340   126,435      
Short-term borrowings 14,778   17,534      
Trading liabilities, Debt and equity instruments 32,964   26,716      
Gross derivative payables 615,334   521,740      
Trading liabilities 648,298   548,456      
Accounts payable and other liabilities 2,928   467      
Beneficial interests issued by consolidated VIEs 5   12      
Long-term debt 42,985   50,560      
Total liabilities measured at fair value on a recurring basis 876,572   752,480      
Recurring | Level 2 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 246,878   267,493      
Gross derivative payables 232,342   237,714      
Recurring | Level 2 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 12,847   9,321      
Gross derivative payables 10,841   10,468      
Recurring | Level 2 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 260,425   168,590      
Gross derivative payables 258,116   174,349      
Recurring | Level 2 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 72,297   65,139      
Gross derivative payables 71,601   72,609      
Recurring | Level 2 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 48,168   26,232      
Gross derivative payables 42,434   26,600      
Recurring | Level 2 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 7,752   4,139      
Recurring | Level 2 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 155,161   139,015      
Recurring | Level 2 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 54,003   42,808      
Available-for-sale securities 71,317   83,558      
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 50,166   38,944      
Available-for-sale securities 63,689   72,539      
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 2,191   2,358      
Available-for-sale securities 5,475   6,070      
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 1,646   1,506      
Available-for-sale securities 2,153   4,949      
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 10,013   9,181      
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 6,938   7,068      
Available-for-sale securities 10,133   15,860      
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 677   852      
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 47,976   44,581      
Available-for-sale securities 9,211   10,779      
Recurring | Level 2 | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 25,943   24,491      
Available-for-sale securities 133   160      
Recurring | Level 2 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 6,900   7,366      
Recurring | Level 2 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,711   2,668      
Recurring | Level 2 | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 10,972   9,662      
Recurring | Level 2 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 3,536   5,448      
Recurring | Level 2 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,429   1,741      
Recurring | Level 2 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 19,480   20,788      
Recurring | Level 2 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 18,861   24,850      
Recurring | Level 3            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 1   0      
Securities borrowed 0   0      
Trading assets, debt and equity instruments 3,281   2,279      
Gross derivative receivables 8,955   7,306      
Trading assets 12,236   9,585      
Available-for-sale securities 186   161      
Loans 2,020   1,933      
Mortgage servicing rights 7,439   5,494      
Total assets measured at fair value on a recurring basis 22,290   17,479      
Deposits 2,032   2,317      
Federal funds purchased and securities loaned or sold under repurchase agreements 0   0      
Short-term borrowings 2,101   2,481      
Trading liabilities, Debt and equity instruments 56   30      
Gross derivative payables 9,249   12,200      
Trading liabilities 9,305   12,230      
Accounts payable and other liabilities 73   69      
Beneficial interests issued by consolidated VIEs 0   0      
Long-term debt 23,077   24,374      
Total liabilities measured at fair value on a recurring basis 36,588   41,471      
Recurring | Level 3 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 2,584   2,020      
Gross derivative payables 2,164   2,036      
Recurring | Level 3 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 731   518      
Gross derivative payables 482   444      
Recurring | Level 3 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,175   855      
Gross derivative payables 930   1,274      
Recurring | Level 3 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 3,884   3,492      
Gross derivative payables 5,118   7,118      
Recurring | Level 3 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 581   421      
Gross derivative payables 555   1,328      
Recurring | Level 3 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 408   306      
Recurring | Level 3 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,531   1,457      
Recurring | Level 3 | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 827   303      
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 803   265      
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 14   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   10      
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 7   7      
Available-for-sale securities 0   0      
Recurring | Level 3 | Certificates of deposit, bankers’ acceptances and commercial paper            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 0   0      
Recurring | Level 3 | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 205   81      
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 574   332      
Available-for-sale securities 186   161      
Recurring | Level 3 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 898   708      
Recurring | Level 3 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 20   26      
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 661   662      
Recurring | Level 3 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2   0      
Recurring | Level 3 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments $ 87   $ 160