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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross $ 639,593 $ 545,287    
Derivative netting adjustments (568,713) (488,206)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 70,880 57,081    
Trading assets 453,799 433,575    
Available-for-sale securities 205,857 308,525    
Loans 42,079 58,820    
Mortgage servicing rights 7,973 5,494 $ 3,276 $ 4,699
Derivative payables, gross 637,513 535,044    
Derivative netting adjustments (586,372) (484,928)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 51,141 50,116    
Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 300,415 270,585    
Derivative netting adjustments (271,996) (248,611)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 28,419 21,974    
Derivative payables, gross 290,291 240,731    
Derivative netting adjustments (274,321) (232,537)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 15,970 8,194    
Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 10,329 9,839    
Derivative netting adjustments (9,239) (8,808)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 1,090 1,031    
Derivative payables, gross 9,971 10,912    
Derivative netting adjustments (9,217) (10,032)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 754 880    
Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 241,579 169,579    
Derivative netting adjustments (218,214) (156,954)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 23,365 12,625    
Derivative payables, gross 251,521 175,746    
Derivative netting adjustments (232,665) (161,649)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 18,856 14,097    
Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 61,913 68,631    
Derivative netting adjustments (52,774) (58,650)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 9,139 9,981    
Derivative payables, gross 62,461 79,727    
Derivative netting adjustments (53,657) (62,494)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 8,804 17,233    
Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 25,357 26,653    
Derivative netting adjustments (16,490) (15,183)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 8,867 11,470    
Derivative payables, gross 23,269 27,928    
Derivative netting adjustments (16,512) (18,216)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 6,757 9,712    
Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 78,081 83,562    
Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 1,958 4,949    
U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 92,060 177,463    
Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 6,600 7,100    
Available-for-sale securities 6,786 15,860    
Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 19,696 16,209    
Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 357 321    
Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 8,877      
Asset-backed securities, collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 5,792 9,662    
Fair Value Measured at Net Asset Value Per Share        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets 43 51    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 950 801    
Other assets 907 750    
Recurring        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Federal funds sold and securities purchased under resale agreements 311,883 252,720    
Securities borrowed 70,041 81,463    
Trading assets, debt and equity instruments 382,876 376,443    
Derivative netting adjustments (568,713) (488,206)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 70,880 57,081    
Trading assets 453,756 433,524    
Available-for-sale securities 205,857 308,525    
Loans 42,079 58,820    
Mortgage servicing rights 7,973 5,494    
Total assets measured at fair value on a recurring basis 1,105,603 1,154,549    
Deposits 28,620 11,333    
Federal funds purchased and securities loaned or sold under repurchase agreements 151,999 126,435    
Short-term borrowings 15,792 20,015    
Trading liabilities, Debt and equity instruments 126,835 114,577    
Derivative netting adjustments (586,372) (484,928)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 51,141 50,116    
Trading liabilities 177,976 164,693    
Accounts payable and other liabilities 7,038 5,651    
Beneficial interests issued by consolidated VIEs 5 12    
Long-term debt 72,281 74,934    
Total liabilities measured at fair value on a recurring basis 453,711 403,073    
Recurring | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 14,014 14,003    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Other assets 14,921 14,753    
Recurring | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (271,996) (248,611)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 28,419 21,974    
Derivative netting adjustments (274,321) (232,537)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 15,970 8,194    
Recurring | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (9,239) (8,808)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 1,090 1,031    
Derivative netting adjustments (9,217) (10,032)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 754 880    
Recurring | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (218,214) (156,954)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 23,365 12,625    
Derivative netting adjustments (232,665) (161,649)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 18,856 14,097    
Recurring | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (52,774) (58,650)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 9,139 9,981    
Derivative netting adjustments (53,657) (62,494)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 8,804 17,233    
Recurring | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative netting adjustments (16,490) (15,183)    
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables 8,867 11,470    
Derivative netting adjustments (16,512) (18,216)    
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables 6,757 9,712    
Recurring | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 253,188 235,981    
Recurring | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 72,879 43,111    
Available-for-sale securities 78,081 83,562    
Recurring | Mortgage-backed securities, U.S. GSEs and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 68,921 39,209    
Available-for-sale securities 71,503 72,543    
Recurring | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,503 2,386    
Available-for-sale securities 4,620 6,070    
Recurring | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 1,455 1,516    
Available-for-sale securities 1,958 4,949    
Recurring | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 69,737 77,708    
Available-for-sale securities 92,060 177,463    
Recurring | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 6,615 7,075    
Available-for-sale securities 6,786 15,860    
Recurring | Certificates of deposit, bankers’ acceptances and commercial paper        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,009 852    
Recurring | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 66,797 71,644    
Available-for-sale securities 19,696 16,209    
Recurring | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 26,089 24,823    
Available-for-sale securities 357 321    
Recurring | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 6,503 8,074    
Recurring | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,559 2,694    
Recurring | Asset-backed securities, collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 5,792 9,662    
Recurring | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 3,085 5,448    
Recurring | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 85,208 89,307    
Recurring | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 26,270 26,145    
Recurring | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 18,210 25,010    
Recurring | US GSE obligations        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 73,800 73,900    
Recurring | Residential mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 9,700 26,200    
Recurring | Commercial mortgage        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 6,800 8,200    
Recurring | Residential conforming mortgage intended for sale to government agency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,400 13,600    
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, debt and equity instruments 171,482 187,770    
Derivative receivables, gross 3,559 1,206    
Trading assets 175,041 188,976    
Available-for-sale securities 102,654 182,897    
Loans 0 0    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 285,239 381,431    
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 98,719 87,831    
Derivative payables, gross 2,803 1,104    
Trading liabilities 101,522 88,935    
Accounts payable and other liabilities 5,702 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 107,224 94,050    
Recurring | Level 1 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 7,544 9,558    
Recurring | Level 1 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 3,390 1,072    
Derivative payables, gross 2,643 981    
Recurring | Level 1 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 169 134    
Derivative payables, gross 160 123    
Recurring | Level 1 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 0 0    
Derivative payables, gross 0 0    
Recurring | Level 1 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 79,404 95,509    
Recurring | Level 1 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 0 0    
Available-for-sale securities 3 4    
Recurring | Level 1 | Mortgage-backed securities, U.S. GSEs and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 0 0    
Available-for-sale securities 3 4    
Recurring | Level 1 | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
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 [Abstract]        
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 [Abstract]        
Trading assets, debt and equity instruments 61,191 68,527    
Available-for-sale securities 92,060 177,463    
Recurring | Level 1 | Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
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 [Abstract]        
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 [Abstract]        
Trading assets, debt and equity instruments 18,213 26,982    
Available-for-sale securities 10,591 5,430    
Recurring | Level 1 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
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 [Abstract]        
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 [Abstract]        
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 [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, debt and equity instruments 82,483 86,904    
Recurring | Level 1 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 9,595 5,357    
Recurring | Level 1 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 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 311,883 252,720    
Securities borrowed 70,041 81,463    
Trading assets, debt and equity instruments 208,485 186,394    
Derivative receivables, gross 625,352 536,775    
Trading assets 833,837 723,169    
Available-for-sale securities 102,964 125,467    
Loans 40,661 56,887    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 1,365,451 1,243,845    
Deposits 26,458 9,016    
Federal funds purchased and securities loaned or sold under repurchase agreements 151,999 126,435    
Short-term borrowings 14,391 17,534    
Trading liabilities, Debt and equity instruments 28,032 26,716    
Derivative payables, gross 624,701 521,740    
Trading liabilities 652,733 548,456    
Accounts payable and other liabilities 1,283 467    
Beneficial interests issued by consolidated VIEs 5 12    
Long-term debt 48,189 50,560    
Total liabilities measured at fair value on a recurring basis 895,058 752,480    
Recurring | Level 2 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 6,065 4,139    
Recurring | Level 2 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 292,956 267,493    
Derivative payables, gross 284,280 237,714    
Recurring | Level 2 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 9,722 9,321    
Derivative payables, gross 9,377 10,468    
Recurring | Level 2 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 240,207 168,590    
Derivative payables, gross 250,647 174,349    
Recurring | Level 2 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 57,485 65,139    
Derivative payables, gross 57,649 72,609    
Recurring | Level 2 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 24,982 26,232    
Derivative payables, gross 22,748 26,600    
Recurring | Level 2 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 171,606 139,015    
Recurring | Level 2 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 72,108 42,808    
Available-for-sale securities 78,078 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 [Abstract]        
Trading assets, debt and equity instruments 68,162 38,944    
Available-for-sale securities 71,500 72,539    
Recurring | Level 2 | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,498 2,358    
Available-for-sale securities 4,620 6,070    
Recurring | Level 2 | Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 1,448 1,506    
Available-for-sale securities 1,958 4,949    
Recurring | Level 2 | U.S. Treasury and government agencies        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 8,546 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 [Abstract]        
Trading assets, debt and equity instruments 6,608 7,068    
Available-for-sale securities 6,786 15,860    
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, debt and equity instruments 2,009 852    
Recurring | Level 2 | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 48,429 44,581    
Available-for-sale securities 9,105 10,779    
Recurring | Level 2 | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 25,626 24,491    
Available-for-sale securities 118 160    
Recurring | Level 2 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 5,744 7,366    
Recurring | Level 2 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,536 2,668    
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 5,792 9,662    
Recurring | Level 2 | Asset-backed securities, other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Available-for-sale securities 3,085 5,448    
Recurring | Level 2 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,060 1,741    
Recurring | Level 2 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 16,673 20,788    
Recurring | Level 2 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 18,146 24,850    
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, debt and equity instruments 2,909 2,279    
Derivative receivables, gross 10,682 7,306    
Trading assets 13,591 9,585    
Available-for-sale securities 239 161    
Loans 1,418 1,933    
Mortgage servicing rights 7,973 5,494    
Total assets measured at fair value on a recurring basis 23,626 17,479    
Deposits 2,162 2,317    
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0    
Short-term borrowings 1,401 2,481    
Trading liabilities, Debt and equity instruments 84 30    
Derivative payables, gross 10,009 12,200    
Trading liabilities 10,093 12,230    
Accounts payable and other liabilities 53 69    
Beneficial interests issued by consolidated VIEs 0 0    
Long-term debt 24,092 24,374    
Total liabilities measured at fair value on a recurring basis 37,801 41,471    
Recurring | Level 3 | Other assets        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Other assets 405 306    
Recurring | Level 3 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 4,069 2,020    
Derivative payables, gross 3,368 2,036    
Recurring | Level 3 | Credit        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 607 518    
Derivative payables, gross 594 444    
Recurring | Level 3 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 1,203 855    
Derivative payables, gross 714 1,274    
Recurring | Level 3 | Equity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 4,428 3,492    
Derivative payables, gross 4,812 7,118    
Recurring | Level 3 | Commodity        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Derivative receivables, gross 375 421    
Derivative payables, gross 521 1,328    
Recurring | Level 3 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2,178 1,457    
Recurring | Level 3 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 771 303    
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 [Abstract]        
Trading assets, debt and equity instruments 759 265    
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 [Abstract]        
Trading assets, debt and equity instruments 5 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 [Abstract]        
Trading assets, debt and equity instruments 7 10    
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, 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 [Abstract]        
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 [Abstract]        
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 [Abstract]        
Trading assets, debt and equity instruments 155 81    
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, debt and equity instruments 463 332    
Available-for-sale securities 239 161    
Recurring | Level 3 | Loans        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 759 708    
Recurring | Level 3 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 23 26    
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 0 0    
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, debt and equity instruments 665 662    
Recurring | Level 3 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments 2 0    
Recurring | Level 3 | Other        
Assets and liabilities measured at fair value on a recurring basis [Abstract]        
Trading assets, debt and equity instruments $ 64 $ 160