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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables $ 569,566   $ 703,368      
Derivative netting adjustments (501,658)   (627,924)      
Net derivative receivables 67,908   75,444      
Trading assets 515,901   503,126      
Available-for-sale securities 251,590   388,178      
Loans 60,628   44,474      
Mortgage servicing rights 5,351 $ 4,549 3,276 $ 3,016 $ 3,080 $ 4,699
Gross derivative payables 547,466   688,887      
Derivative netting adjustments (493,981)   (618,264)      
Net derivative payables 53,485   70,623      
Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 285,109   391,648      
Derivative netting adjustments (260,343)   (355,923)      
Net derivative receivables 24,766   35,725      
Gross derivative payables 252,292   353,987      
Derivative netting adjustments (243,460)   (340,975)      
Net derivative payables 8,832   13,012      
Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 10,524   13,345      
Derivative netting adjustments (9,349)   (12,665)      
Net derivative receivables 1,175   680      
Gross derivative payables 11,799   14,832      
Derivative netting adjustments (10,406)   (12,837)      
Net derivative payables 1,393   1,995      
Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 163,196   206,260      
Derivative netting adjustments (148,671)   (190,479)      
Net derivative receivables 14,525   15,781      
Gross derivative payables 162,095   215,926      
Derivative netting adjustments (148,090)   (194,493)      
Net derivative payables 14,005   21,433      
Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 74,422   70,612      
Derivative netting adjustments (63,930)   (54,125)      
Net derivative receivables 10,492   16,487      
Gross derivative payables 86,837   81,413      
Derivative netting adjustments (69,063)   (55,515)      
Net derivative payables 17,774   25,898      
Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 36,315   21,503      
Derivative netting adjustments (19,365)   (14,732)      
Net derivative receivables 16,950   6,771      
Gross derivative payables 34,443   22,729      
Derivative netting adjustments (22,962)   (14,444)      
Net derivative payables 11,481   8,285      
Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 82,554   126,390      
Mortgage-backed securities, Commercial - nonagency            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 3,132   2,856      
U.S. Treasury, GSEs and government agencies            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 121,471   201,951      
Obligations of U.S. states and municipalities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 17,515   20,396      
Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 15,825   22,928      
Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 260   216      
Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 13,965          
Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 9,137   10,048      
U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 44,100   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 813   670      
Other assets 757   618      
Recurring            
Assets and liabilities measured at fair value on a recurring basis            
Federal funds sold and securities purchased under resale agreements 273,158   238,015      
Securities borrowed 72,833   52,983      
Trading assets, debt and equity instruments 447,937   427,630      
Derivative netting adjustments (501,658)   (627,924)      
Net derivative receivables 67,908   75,444      
Trading assets 515,845   503,074      
Available-for-sale securities 251,590   388,178      
Loans 60,628   44,474      
Mortgage servicing rights 5,351   3,276      
Total assets measured at fair value on a recurring basis 1,193,119   1,243,209      
Deposits 11,808   14,484      
Federal funds purchased and securities loaned or sold under repurchase agreements 187,439   155,735      
Short-term borrowings 20,033   16,893      
Trading liabilities, Debt and equity instruments 126,058   99,558      
Derivative netting adjustments (493,981)   (618,264)      
Net derivative payables 53,485   70,623      
Trading liabilities 179,543   170,181      
Accounts payable and other liabilities 5,340   3,476      
Beneficial interests issued by consolidated VIEs 99   41      
Long-term debt 76,499   76,817      
Total liabilities measured at fair value on a recurring basis 480,761   437,627      
Recurring | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (260,343)   (355,923)      
Net derivative receivables 24,766   35,725      
Derivative netting adjustments (243,460)   (340,975)      
Net derivative payables 8,832   13,012      
Recurring | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (9,349)   (12,665)      
Net derivative receivables 1,175   680      
Derivative netting adjustments (10,406)   (12,837)      
Net derivative payables 1,393   1,995      
Recurring | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (148,671)   (190,479)      
Net derivative receivables 14,525   15,781      
Derivative netting adjustments (148,090)   (194,493)      
Net derivative payables 14,005   21,433      
Recurring | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (63,930)   (54,125)      
Net derivative receivables 10,492   16,487      
Derivative netting adjustments (69,063)   (55,515)      
Net derivative payables 17,774   25,898      
Recurring | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Derivative netting adjustments (19,365)   (14,732)      
Net derivative receivables 16,950   6,771      
Derivative netting adjustments (22,962)   (14,444)      
Net derivative payables 11,481   8,285      
Recurring | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 13,714   13,209      
Fair value assets and liabilities measured on recurring basis - supplemental data            
Other assets 14,471   13,827      
Recurring | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 277,960   294,496      
Recurring | Total mortgage-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 40,031   72,340      
Available-for-sale securities 82,554   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 36,045   68,844      
Available-for-sale securities 73,049   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 2,305   2,166      
Available-for-sale securities 6,373   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 1,681   1,330      
Available-for-sale securities 3,132   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 96,905   115,259      
Available-for-sale securities 121,471   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 6,742   7,192      
Available-for-sale securities 17,515   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 2,567   1,230      
Recurring | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 89,935   67,625      
Available-for-sale securities 15,825   22,928      
Recurring | Corporate debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 31,842   21,524      
Available-for-sale securities 260   216      
Recurring | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 7,341   6,994      
Recurring | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 2,597   2,332      
Recurring | Asset-backed securities, Collateralized loan obligations            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 9,137   10,048      
Recurring | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 4,828   6,249      
Recurring | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 126,641   100,163      
Recurring | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 19,358   11,571      
Recurring | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 23,978   21,400      
Recurring | U.S. GSE obligations            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 68,600   117,600      
Recurring | Residential mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 27,200   15,100      
Recurring | Commercial mortgage            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 8,100   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 13,100   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 259,929   234,452      
Gross derivative receivables 2,166   2,464      
Trading assets 262,095   236,916      
Available-for-sale securities 126,928   215,093      
Loans 0   0      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 398,355   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 98,932   82,669      
Gross derivative payables 1,909   2,628      
Trading liabilities 100,841   85,297      
Accounts payable and other liabilities 4,957   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 105,798   88,192      
Recurring | Level 1 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,931   2,318      
Gross derivative payables 1,661   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 235   146      
Gross derivative payables 248   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 9,332   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 129,109   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 87,623   104,263      
Available-for-sale securities 121,471   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 | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 41,486   26,772      
Available-for-sale securities 5,457   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 124,349   97,035      
Recurring | Level 1 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 6,471   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 273,158   238,015      
Securities borrowed 72,833   52,983      
Trading assets, debt and equity instruments 185,483   190,555      
Gross derivative receivables 560,656   693,236      
Trading assets 746,139   883,791      
Available-for-sale securities 124,567   173,085      
Loans 58,557   42,169      
Mortgage servicing rights 0   0      
Total assets measured at fair value on a recurring basis 1,279,315   1,394,604      
Deposits 9,431   11,571      
Federal funds purchased and securities loaned or sold under repurchase agreements 187,439   155,735      
Short-term borrowings 17,622   14,473      
Trading liabilities, Debt and equity instruments 27,096   16,838      
Gross derivative payables 533,428   673,598      
Trading liabilities 560,524   690,436      
Accounts payable and other liabilities 332   513      
Beneficial interests issued by consolidated VIEs 99   41      
Long-term debt 52,985   53,420      
Total liabilities measured at fair value on a recurring basis 828,432   926,189      
Recurring | Level 2 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 281,315   387,023      
Gross derivative payables 248,655   349,442      
Recurring | Level 2 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 10,032   12,721      
Gross derivative payables 11,301   13,984      
Recurring | Level 2 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 162,182   205,127      
Gross derivative payables 160,511   214,373      
Recurring | Level 2 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 71,346   67,093      
Gross derivative payables 79,924   74,032      
Recurring | Level 2 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 35,781   21,272      
Gross derivative payables 33,037   21,767      
Recurring | Level 2 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 4,061   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 147,018   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 39,689   71,860      
Available-for-sale securities 82,554   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 35,746   68,395      
Available-for-sale securities 73,049   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 2,281   2,138      
Available-for-sale securities 6,373   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 1,662   1,327      
Available-for-sale securities 3,132   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 9,282   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 6,735   7,184      
Available-for-sale securities 17,515   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 2,567   1,230      
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 48,345   40,671      
Available-for-sale securities 10,368   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 31,472   21,017      
Available-for-sale securities 165   216      
Recurring | Level 2 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 6,359   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 2,569   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 9,137   10,048      
Recurring | Level 2 | Asset-backed securities, Other            
Assets and liabilities measured at fair value on a recurring basis            
Available-for-sale securities 4,828   6,249      
Recurring | Level 2 | Equity securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,658   2,652      
Recurring | Level 2 | Physical commodities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 12,887   5,189      
Recurring | Level 2 | Other            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 23,920   21,351      
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 2,525   2,623      
Gross derivative receivables 6,744   7,668      
Trading assets 9,269   10,291      
Available-for-sale securities 95   0      
Loans 2,071   2,305      
Mortgage servicing rights 5,351   3,276      
Total assets measured at fair value on a recurring basis 17,107   16,410      
Deposits 2,377   2,913      
Federal funds purchased and securities loaned or sold under repurchase agreements 0   0      
Short-term borrowings 2,411   2,420      
Trading liabilities, Debt and equity instruments 30   51      
Gross derivative payables 12,129   12,661      
Trading liabilities 12,159   12,712      
Accounts payable and other liabilities 51   68      
Beneficial interests issued by consolidated VIEs 0   0      
Long-term debt 23,514   23,397      
Total liabilities measured at fair value on a recurring basis 40,512   41,510      
Recurring | Level 3 | Interest rate            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 1,863   2,307      
Gross derivative payables 1,976   2,049      
Recurring | Level 3 | Credit            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 492   624      
Gross derivative payables 498   848      
Recurring | Level 3 | Foreign exchange            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 779   987      
Gross derivative payables 1,336   1,421      
Recurring | Level 3 | Equity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 3,076   3,519      
Gross derivative payables 6,913   7,381      
Recurring | Level 3 | Commodity            
Assets and liabilities measured at fair value on a recurring basis            
Gross derivative receivables 534   231      
Gross derivative payables 1,406   962      
Recurring | Level 3 | Other assets            
Assets and liabilities measured at fair value on a recurring basis            
Other assets 321   538      
Recurring | Level 3 | Total debt instruments            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 1,833   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 342   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 299   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 24   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 19   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 7   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 | Non-U.S. government debt securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 104   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 370   507      
Available-for-sale securities 95   0      
Recurring | Level 3 | Loans            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 982   893      
Recurring | Level 3 | Asset-backed securities            
Assets and liabilities measured at fair value on a recurring basis            
Trading assets, debt and equity instruments 28   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 634   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 $ 58   $ 49