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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables $ 516,475 $ 526,239    
Derivative netting adjustments (466,142) (472,026)    
Net derivative receivables 50,333 54,213    
Trading assets 533,402 413,714    
Available-for-sale securities 236,516 230,394    
Loans 3,719 3,151    
Mortgage servicing rights 5,957 6,130 $ 6,202 $ 6,030
Gross derivative payables 490,219 501,888    
Derivative netting adjustments (451,216) (460,119)    
Net derivative payables 39,003 41,769    
Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 292,267 268,704    
Derivative netting adjustments (269,509) (245,490)    
Net derivative receivables 22,758 23,214    
Gross derivative payables 262,370 242,782    
Derivative netting adjustments (254,648) (234,998)    
Net derivative payables 7,722 7,784    
Credit        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 15,920 20,095    
Derivative netting adjustments (15,196) (19,483)    
Net derivative receivables 724 612    
Gross derivative payables 17,039 20,276    
Derivative netting adjustments (15,056) (18,609)    
Net derivative payables 1,983 1,667    
Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 149,995 167,685    
Derivative netting adjustments (138,124) (154,235)    
Net derivative receivables 11,871 13,450    
Gross derivative payables 148,032 165,217    
Derivative netting adjustments (136,634) (152,432)    
Net derivative payables 11,398 12,785    
Equity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 43,264 49,285    
Derivative netting adjustments (33,942) (39,339)    
Net derivative receivables 9,322 9,946    
Gross derivative payables 45,645 51,195    
Derivative netting adjustments (34,616) (41,034)    
Net derivative payables 11,029 10,161    
Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 15,029 20,470    
Derivative netting adjustments (9,371) (13,479)    
Net derivative receivables 5,658 6,991    
Gross derivative payables 17,133 22,418    
Derivative netting adjustments (10,262) (13,046)    
Net derivative payables 6,871 9,372    
Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 91,723 83,820    
Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 6,687 6,654    
U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 58,764 56,059    
Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 34,487 37,723    
Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 75 75    
Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 22,035 24,102    
Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 1,792 1,918    
Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 27,640      
Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 20,929 19,437    
U.S. government-sponsored enterprise obligations        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 55,300 50,700    
Residential mortgage        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 15,200 13,200    
Commercial mortgage        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 2,700 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 8,100 7,600    
Fair Value Measured at Net Asset Value Per Share        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets 46 49    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 736 747    
Other assets 690 698    
Recurring        
Assets and liabilities measured at fair value on a recurring basis        
Federal funds sold and securities purchased under resale agreements 13,969 13,235    
Securities borrowed 5,642 5,105    
Trading assets, debt and equity instruments 483,023 359,452    
Derivative netting adjustments (466,142) (472,026)    
Net derivative receivables 50,333 54,213    
Trading assets 533,356 413,665    
Available-for-sale securities 236,516 230,394    
Loans 3,719 3,151    
Mortgage servicing rights 5,957 6,130    
Total assets measured at fair value on a recurring basis 808,746 680,612    
Deposits 31,804 23,217    
Federal funds purchased and securities loaned or sold under repurchase agreements 971 935    
Short-term borrowings 7,198 7,130    
Trading liabilities, Debt and equity instruments 117,904 103,004    
Derivative netting adjustments (451,216) (460,119)    
Net derivative payables 39,003 41,769    
Trading liabilities 156,907 144,773    
Accounts payable and other liabilities 3,277 3,269    
Beneficial interests issued by consolidated VIEs 13 28    
Long-term debt 61,241 54,886    
Total liabilities measured at fair value on a recurring basis 261,411 234,238    
Recurring | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (269,509) (245,490)    
Net derivative receivables 22,758 23,214    
Derivative netting adjustments (254,648) (234,998)    
Net derivative payables 7,722 7,784    
Recurring | Credit        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (15,196) (19,483)    
Net derivative receivables 724 612    
Derivative netting adjustments (15,056) (18,609)    
Net derivative payables 1,983 1,667    
Recurring | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (138,124) (154,235)    
Net derivative receivables 11,871 13,450    
Derivative netting adjustments (136,634) (152,432)    
Net derivative payables 11,398 12,785    
Recurring | Equity        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (33,942) (39,339)    
Net derivative receivables 9,322 9,946    
Derivative netting adjustments (34,616) (41,034)    
Net derivative payables 11,029 10,161    
Recurring | Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (9,371) (13,479)    
Net derivative receivables 5,658 6,991    
Derivative netting adjustments (10,262) (13,046)    
Net derivative payables 6,871 9,372    
Recurring | Other assets        
Assets and liabilities measured at fair value on a recurring basis        
Other assets 9,587 8,932    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Other assets 10,277 9,630    
Recurring | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 354,670 267,089    
Recurring | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 100,604 80,172    
Available-for-sale securities 91,723 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 96,510 76,798    
Available-for-sale securities 74,923 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 2,204 1,862    
Available-for-sale securities 10,113 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 1,890 1,512    
Available-for-sale securities 6,687 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 102,713 59,179    
Available-for-sale securities 58,764 56,059    
Recurring | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 6,823 7,810    
Available-for-sale securities 34,487 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 3,029 1,214    
Recurring | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 75 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 72,032 55,089    
Available-for-sale securities 22,035 24,102    
Recurring | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 22,443 18,989    
Available-for-sale securities 1,792 1,918    
Recurring | Loans        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 44,412 41,753    
Recurring | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 2,614 2,883    
Recurring | Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 20,929 19,437    
Recurring | Asset-backed securities, Other        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 6,711 7,260    
Recurring | Equity securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 107,581 71,833    
Recurring | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 7,145 7,037    
Recurring | Other        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 13,627 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 128,000 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 243,665 155,656    
Gross derivative receivables 2,394 1,453    
Trading assets 246,059 157,109    
Available-for-sale securities 73,085 71,372    
Loans 0 0    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 327,807 236,291    
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 95,128 80,199    
Gross derivative payables 3,057 2,221    
Trading liabilities 98,185 82,420    
Accounts payable and other liabilities 3,186 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 101,371 85,483    
Recurring | Level 1 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 1,799 682    
Gross derivative payables 2,507 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 595 771    
Gross derivative payables 550 695    
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 8,663 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 131,958 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 92,642 51,477    
Available-for-sale securities 58,764 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 39,316 27,878    
Available-for-sale securities 14,321 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 107,042 71,119    
Recurring | Level 1 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 4,665 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 13,969 13,235    
Securities borrowed 5,642 5,105    
Trading assets, debt and equity instruments 235,117 199,628    
Gross derivative receivables 508,147 518,969    
Trading assets 743,264 718,597    
Available-for-sale securities 163,431 159,021    
Loans 3,596 3,029    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 929,985 899,182    
Deposits 27,276 19,048    
Federal funds purchased and securities loaned or sold under repurchase agreements 971 935    
Short-term borrowings 5,696 5,607    
Trading liabilities, Debt and equity instruments 22,724 22,755    
Gross derivative payables 477,879 490,054    
Trading liabilities 500,603 512,809    
Accounts payable and other liabilities 76 196    
Beneficial interests issued by consolidated VIEs 13 27    
Long-term debt 39,586 35,468    
Total liabilities measured at fair value on a recurring basis 574,221 574,090    
Recurring | Level 2 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 289,034 266,380    
Gross derivative payables 258,282 239,576    
Recurring | Level 2 | Credit        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 15,140 19,235    
Gross derivative payables 16,144 19,309    
Recurring | Level 2 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 148,848 166,238    
Gross derivative payables 146,574 163,549    
Recurring | Level 2 | Equity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 40,286 46,777    
Gross derivative payables 40,601 46,462    
Recurring | Level 2 | Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 14,839 20,339    
Gross derivative payables 16,278 21,158    
Recurring | Level 2 | Other assets        
Assets and liabilities measured at fair value on a recurring basis        
Other assets 83 195    
Recurring | Level 2 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 218,977 184,099    
Recurring | Level 2 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 100,090 79,548    
Available-for-sale securities 91,723 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 96,098 76,249    
Available-for-sale securities 74,923 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 2,119 1,798    
Available-for-sale securities 10,113 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 1,873 1,501    
Available-for-sale securities 6,687 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 10,071 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 6,200 7,121    
Available-for-sale securities 34,487 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 3,029 1,214    
Recurring | Level 2 | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 75 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 32,546 27,056    
Available-for-sale securities 7,714 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 21,875 18,655    
Available-for-sale securities 1,792 1,918    
Recurring | Level 2 | Loans        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 42,671 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 2,495 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 20,929 19,437    
Recurring | Level 2 | Asset-backed securities, Other        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 6,711 7,260    
Recurring | Level 2 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 337 482    
Recurring | Level 2 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 2,480 1,855    
Recurring | Level 2 | Other        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 13,323 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 4,241 4,168    
Gross derivative receivables 5,934 5,817    
Trading assets 10,175 9,985    
Available-for-sale securities 0 1    
Loans 123 122    
Mortgage servicing rights 5,957 6,130    
Total assets measured at fair value on a recurring basis 17,096 17,165    
Deposits 4,528 4,169    
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0    
Short-term borrowings 1,502 1,523    
Trading liabilities, Debt and equity instruments 52 50    
Gross derivative payables 9,283 9,613    
Trading liabilities 9,335 9,663    
Accounts payable and other liabilities 15 10    
Beneficial interests issued by consolidated VIEs 0 1    
Long-term debt 21,655 19,418    
Total liabilities measured at fair value on a recurring basis 37,035 34,784    
Recurring | Level 3 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 1,434 1,642    
Gross derivative payables 1,581 1,680    
Recurring | Level 3 | Credit        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 780 860    
Gross derivative payables 895 967    
Recurring | Level 3 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 552 676    
Gross derivative payables 908 973    
Recurring | Level 3 | Equity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 2,978 2,508    
Gross derivative payables 5,044 4,733    
Recurring | Level 3 | Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 190 131    
Gross derivative payables 855 1,260    
Recurring | Level 3 | Other assets        
Assets and liabilities measured at fair value on a recurring basis        
Other assets 841 927    
Recurring | Level 3 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 3,735 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 514 624    
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 412 549    
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 85 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 17 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 623 689    
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 170 155    
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 568 334    
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 1,741 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 119 127    
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 202 232    
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 $ 304 $ 301