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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables $ 559,553 $ 922,616    
Derivative netting adjustments (503,030) (858,538)    
Net derivative receivables 56,523 64,078    
Trading assets 381,844 372,130    
Available-for-sale securities 202,225 238,891    
Loans 2,508 2,230    
Mortgage servicing rights 6,030 6,096 $ 6,608 $ 7,436
Derivative payables, gross 530,806 893,239    
Derivative netting adjustments (493,029) (844,008)    
Derivative payables, net 37,777 49,231    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 779 1,000    
Other assets        
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 725 977    
Trading assets        
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 54 52    
Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 315,992 605,963    
Derivative netting adjustments (291,319) (577,661)    
Net derivative receivables 24,673 28,302    
Derivative payables, gross 284,436 570,778    
Derivative netting adjustments (277,306) (559,963)    
Derivative payables, net 7,129 10,815    
Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 23,205 29,645    
Derivative netting adjustments (22,335) (28,351)    
Net derivative receivables 869 1,294    
Derivative payables, gross 23,252 28,666    
Derivative netting adjustments (21,954) (27,255)    
Derivative payables, net 1,299 1,411    
Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 160,231 233,426    
Derivative netting adjustments (144,081) (210,154)    
Net derivative receivables 16,151 23,271    
Derivative payables, gross 155,822 234,971    
Derivative netting adjustments (143,349) (214,463)    
Derivative payables, net 12,473 20,508    
Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 40,040 34,940    
Derivative netting adjustments (32,158) (30,001)    
Net derivative receivables 7,882 4,939    
Derivative payables, gross 45,395 38,362    
Derivative netting adjustments (36,203) (30,222)    
Derivative payables, net 9,192 8,140    
Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 20,085 18,642    
Derivative netting adjustments (13,137) (12,371)    
Net derivative receivables 6,948 6,272    
Derivative payables, gross 21,901 20,462    
Derivative netting adjustments (14,217) (12,105)    
Derivative payables, net 7,684 8,357    
Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 9,800 9,100    
US government-sponsored and enterprises obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 45,800 45,800    
Residential mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 11,400 16,500    
Commercial mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 4,200 3,300    
Residential conforming mortgage intended for sale to government agency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 5,700 11,000    
Reverse mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 836 2,000    
Recurring        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Federal funds sold and securities purchased under resale agreements 14,732 21,506    
Securities borrowed 3,049 0    
Trading assets 325,267 308,000    
Derivative netting adjustments (503,030) (858,538)    
Net derivative receivables 56,523 64,078    
Trading assets 381,790 372,078    
Available-for-sale securities 202,225 238,891    
Loans 2,508 2,230    
Mortgage servicing rights 6,030 6,096    
Total assets measured at fair value on a recurring basis 625,737 647,381    
Deposits 21,321 13,912    
Federal funds purchased and securities loaned or sold under repurchase agreements 697 687    
Short-term borrowings 9,191 9,105    
Trading liabilities, Debt and equity instruments 85,886 87,428    
Derivative netting adjustments (493,029) (844,008)    
Derivative payables, net 37,777 49,231    
Trading liabilities 123,663 136,659    
Accounts payable and other liabilities 9,208 9,120    
Beneficial interests issued by consolidated VIEs 45 120    
Long-term debt 47,519 37,686    
Total liabilities measured at fair value on a recurring basis 211,644 207,289    
Recurring | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 15,403 6,580    
Recurring | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (291,319) (577,661)    
Net derivative receivables 24,673 28,302    
Derivative netting adjustments (277,306) (559,963)    
Derivative payables, net 7,129 10,815    
Recurring | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (22,335) (28,351)    
Net derivative receivables 869 1,294    
Derivative netting adjustments (21,954) (27,255)    
Derivative payables, net 1,299 1,411    
Recurring | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (144,081) (210,154)    
Net derivative receivables 16,151 23,271    
Derivative netting adjustments (143,349) (214,463)    
Derivative payables, net 12,473 20,508    
Recurring | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (32,158) (30,001)    
Net derivative receivables 7,882 4,939    
Derivative netting adjustments (36,203) (30,222)    
Derivative payables, net 9,192 8,140    
Recurring | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (13,137) (12,371)    
Net derivative receivables 6,948 6,272    
Derivative netting adjustments (14,217) (12,105)    
Derivative payables, net 7,684 8,357    
Recurring | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 216,296 193,666    
Recurring | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 45,373 43,964    
Available-for-sale securities 86,672 87,552    
Recurring | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 41,822 40,991    
Available-for-sale securities 70,280 64,005    
Recurring | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,895 1,635    
Available-for-sale securities 11,367 14,443    
Recurring | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,656 1,338    
Available-for-sale securities 5,025 9,104    
Recurring | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 37,234 24,755    
Available-for-sale securities 22,745 44,101    
Recurring | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 9,811 9,052    
Available-for-sale securities 32,338 31,592    
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 226 1,649    
Recurring | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 59 106    
Recurring | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 57,796 51,565    
Available-for-sale securities 27,294 35,288    
Recurring | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 24,458 23,327    
Available-for-sale securities 2,757 4,958    
Recurring | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 37,961 33,802    
Recurring | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 3,437 5,552    
Recurring | Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 20,996 27,401    
Recurring | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 8,817 6,967    
Recurring | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 87,838 97,271    
Available-for-sale securities 547 926    
Recurring | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 6,246 6,961    
Recurring | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 14,887 10,102    
Recurring | US government-sponsored and enterprises obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 78,000 80,600    
Recurring | Level 1        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Federal funds sold and securities purchased under resale agreements 0 0    
Securities borrowed 0 0    
Trading assets 151,915 150,110    
Gross derivative receivables 1,022 1,685    
Trading assets 152,937 151,795    
Available-for-sale securities 41,432 67,791    
Loans 0 0    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 208,164 223,943    
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 64,664 68,304    
Derivative payables, gross 964 1,614    
Trading liabilities 65,628 69,918    
Accounts payable and other liabilities 9,074 9,107    
Beneficial interests issued by consolidated VIEs 0 0    
Long-term debt 0 0    
Total liabilities measured at fair value on a recurring basis 74,702 79,025    
Recurring | Level 1 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 13,795 4,357    
Recurring | Level 1 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 181 715    
Derivative payables, gross 170 539    
Recurring | Level 1 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 841 812    
Derivative payables, gross 794 902    
Recurring | Level 1 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 0 158    
Derivative payables, gross 0 173    
Recurring | Level 1 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 59,645 48,010    
Recurring | Level 1 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 13    
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 [Abstract]        
Trading assets 0 13    
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 [Abstract]        
Trading assets 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 [Abstract]        
Trading assets 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 [Abstract]        
Trading assets 30,758 19,554    
Available-for-sale securities 22,745 44,072    
Recurring | Level 1 | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 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 [Abstract]        
Trading assets 0 0    
Recurring | Level 1 | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
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 [Abstract]        
Trading assets 28,887 28,443    
Available-for-sale securities 18,140 22,793    
Recurring | Level 1 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Available-for-sale securities 0 0    
Recurring | Level 1 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Recurring | Level 1 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Recurring | Level 1 | Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 0 0    
Recurring | Level 1 | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 0 0    
Recurring | Level 1 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 87,346 96,759    
Available-for-sale securities 547 926    
Recurring | Level 1 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 4,924 5,341    
Recurring | Level 1 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Recurring | Level 2        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Federal funds sold and securities purchased under resale agreements 14,732 21,506    
Securities borrowed 3,049 0    
Trading assets 167,982 149,996    
Gross derivative receivables 552,533 915,138    
Trading assets 720,515 1,065,134    
Available-for-sale securities 160,516 170,436    
Loans 2,232 1,660    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 901,387 1,258,736    
Deposits 17,179 11,795    
Federal funds purchased and securities loaned or sold under repurchase agreements 697 687    
Short-term borrowings 7,526 7,971    
Trading liabilities, Debt and equity instruments 21,183 19,081    
Derivative payables, gross 519,594 883,472    
Trading liabilities 540,777 902,553    
Accounts payable and other liabilities 121 0    
Beneficial interests issued by consolidated VIEs 6 72    
Long-term debt 31,394 24,836    
Total liabilities measured at fair value on a recurring basis 597,700 947,914    
Recurring | Level 2 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 343 0    
Recurring | Level 2 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 314,107 602,747    
Derivative payables, gross 282,825 569,001    
Recurring | Level 2 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 21,995 28,256    
Derivative payables, gross 22,009 27,375    
Recurring | Level 2 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 158,834 231,743    
Derivative payables, gross 154,075 231,815    
Recurring | Level 2 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 37,722 34,032    
Derivative payables, gross 39,668 35,202    
Recurring | Level 2 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 19,875 18,360    
Derivative payables, gross 21,017 20,079    
Recurring | Level 2 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 152,266 138,754    
Recurring | Level 2 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 44,995 43,459    
Available-for-sale securities 86,671 87,551    
Recurring | Level 2 | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 41,515 40,586    
Available-for-sale securities 70,280 64,005    
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,835 1,552    
Available-for-sale securities 11,366 14,442    
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,645 1,321    
Available-for-sale securities 5,025 9,104    
Recurring | Level 2 | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 6,475 5,201    
Available-for-sale securities 0 29    
Recurring | Level 2 | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 9,067 8,403    
Available-for-sale securities 32,338 31,592    
Recurring | Level 2 | Certificates of deposit, bankers’ acceptances and commercial paper        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 226 1,649    
Recurring | Level 2 | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 59 106    
Recurring | Level 2 | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 28,831 23,076    
Available-for-sale securities 9,154 12,495    
Recurring | Level 2 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 24,146 22,751    
Available-for-sale securities 2,757 4,958    
Recurring | Level 2 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 35,242 28,965    
Recurring | Level 2 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 3,284 5,250    
Recurring | Level 2 | Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 20,720 26,738    
Recurring | Level 2 | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 8,817 6,967    
Recurring | Level 2 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 197 281    
Available-for-sale securities 0 0    
Recurring | Level 2 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 1,322 1,620    
Recurring | Level 2 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 14,197 9,341    
Recurring | Level 3        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Federal funds sold and securities purchased under resale agreements 0 0    
Securities borrowed 0 0    
Trading assets 5,370 7,894    
Gross derivative receivables 5,998 5,793    
Trading assets 11,368 13,687    
Available-for-sale securities 277 664    
Loans 276 570    
Mortgage servicing rights 6,030 6,096    
Total assets measured at fair value on a recurring basis 19,216 23,240    
Deposits 4,142 2,117    
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0    
Short-term borrowings 1,665 1,134    
Trading liabilities, Debt and equity instruments 39 43    
Derivative payables, gross 10,248 8,153    
Trading liabilities 10,287 8,196    
Accounts payable and other liabilities 13 13    
Beneficial interests issued by consolidated VIEs 39 48    
Long-term debt 16,125 12,850    
Total liabilities measured at fair value on a recurring basis 32,271 24,358    
Recurring | Level 3 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 1,265 2,223    
Recurring | Level 3 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 1,704 2,501    
Derivative payables, gross 1,440 1,238    
Recurring | Level 3 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 1,209 1,389    
Derivative payables, gross 1,244 1,291    
Recurring | Level 3 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 557 870    
Derivative payables, gross 953 2,254    
Recurring | Level 3 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 2,318 908    
Derivative payables, gross 5,727 3,160    
Recurring | Level 3 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Gross derivative receivables 210 125    
Derivative payables, gross 884 210    
Recurring | Level 3 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 4,385 6,902    
Recurring | Level 3 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 378 492    
Available-for-sale securities 1 1    
Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 307 392    
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 [Abstract]        
Trading assets 60 83    
Available-for-sale securities 1 1    
Recurring | Level 3 | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 11 17    
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 [Abstract]        
Trading assets 1 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 [Abstract]        
Trading assets 744 649    
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 [Abstract]        
Trading assets 0 0    
Recurring | Level 3 | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
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 [Abstract]        
Trading assets 78 46    
Available-for-sale securities 0 0    
Recurring | Level 3 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 312 576    
Available-for-sale securities 0 0    
Recurring | Level 3 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 2,719 4,837    
Recurring | Level 3 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 153 302    
Recurring | Level 3 | Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 276 663    
Recurring | Level 3 | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 0 0    
Recurring | Level 3 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 295 231    
Available-for-sale securities 0 0    
Recurring | Level 3 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 0 0    
Recurring | Level 3 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets $ 690 $ 761