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Fair Value Measurement - Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables $ 609,717 $ 707,554    
Derivative netting adjustments (536,598) (627,924)    
Net derivative receivables 73,119 79,630    
Trading assets 544,052 503,126    
Available-for-sale securities 379,942 388,178    
Loans 50,767 44,474    
Mortgage servicing rights 4,470 3,276 $ 3,267 $ 4,699
Gross derivative payables 582,697 688,887    
Derivative netting adjustments (522,257) (618,264)    
Net derivative payables 60,440 70,623    
Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 311,621 391,490    
Derivative netting adjustments (283,073) (355,765)    
Net derivative receivables 28,548 35,725    
Gross derivative payables 279,186 353,627    
Derivative netting adjustments (268,442) (340,615)    
Net derivative payables 10,744 13,012    
Credit        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 14,212 13,503    
Derivative netting adjustments (13,164) (12,823)    
Net derivative receivables 1,048 680    
Gross derivative payables 14,602 15,192    
Derivative netting adjustments (12,704) (13,197)    
Net derivative payables 1,898 1,995    
Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 186,627 206,260    
Derivative netting adjustments (171,515) (190,479)    
Net derivative receivables 15,112 15,781    
Gross derivative payables 185,506 215,926    
Derivative netting adjustments (168,468) (194,493)    
Net derivative payables 17,038 21,433    
Equity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 73,578 74,798    
Derivative netting adjustments (53,825) (54,125)    
Net derivative receivables 19,753 20,673    
Gross derivative payables 79,543 81,413    
Derivative netting adjustments (57,143) (55,515)    
Net derivative payables 22,400 25,898    
Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 23,679 21,503    
Derivative netting adjustments (15,021) (14,732)    
Net derivative receivables 8,658 6,771    
Gross derivative payables 23,860 22,729    
Derivative netting adjustments (15,500) (14,444)    
Net derivative payables 8,360 8,285    
Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 126,089 126,390    
Mortgage-backed securities, Commercial - nonagency        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 3,029 2,856    
U.S. Treasury, GSEs and government agencies        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 194,784 201,951    
Obligations of U.S. states and municipalities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 19,922 20,396    
Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 20,873 22,928    
Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 210 216    
Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 18,064      
Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 11,329 10,048    
U.S. GSE obligations        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 61,000 65,800    
Fair Value Measured at Net Asset Value Per Share        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets 55 52    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Alternative investments, net asset value, fair value 678 670    
Other assets 623 618    
Recurring        
Assets and liabilities measured at fair value on a recurring basis        
Federal funds sold and securities purchased under resale agreements 267,613 238,015    
Securities borrowed 66,277 52,983    
Trading assets, debt and equity instruments 470,878 423,444    
Derivative netting adjustments (536,598) (627,924)    
Net derivative receivables 73,119 79,630    
Trading assets 543,997 503,074    
Available-for-sale securities 379,942 388,178    
Loans 50,767 44,474    
Mortgage servicing rights 4,470 3,276    
Total assets measured at fair value on a recurring basis 1,362,935 1,243,209    
Deposits 14,107 14,484    
Federal funds purchased and securities loaned or sold under repurchase agreements 197,834 155,735    
Short-term borrowings 20,002 16,893    
Trading liabilities, Debt and equity instruments 130,909 99,558    
Derivative netting adjustments (522,257) (618,264)    
Net derivative payables 60,440 70,623    
Trading liabilities 191,349 170,181    
Accounts payable and other liabilities 42,824 3,476    
Beneficial interests issued by consolidated VIEs 193 41    
Long-term debt 75,693 76,817    
Total liabilities measured at fair value on a recurring basis 542,002 437,627    
Recurring | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (283,073) (355,765)    
Net derivative receivables 28,548 35,725    
Derivative netting adjustments (268,442) (340,615)    
Net derivative payables 10,744 13,012    
Recurring | Credit        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (13,164) (12,823)    
Net derivative receivables 1,048 680    
Derivative netting adjustments (12,704) (13,197)    
Net derivative payables 1,898 1,995    
Recurring | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (171,515) (190,479)    
Net derivative receivables 15,112 15,781    
Derivative netting adjustments (168,468) (194,493)    
Net derivative payables 17,038 21,433    
Recurring | Equity        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (53,825) (54,125)    
Net derivative receivables 19,753 20,673    
Derivative netting adjustments (57,143) (55,515)    
Net derivative payables 22,400 25,898    
Recurring | Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Derivative netting adjustments (15,021) (14,732)    
Net derivative receivables 8,658 6,771    
Derivative netting adjustments (15,500) (14,444)    
Net derivative payables 8,360 8,285    
Recurring | Other assets        
Assets and liabilities measured at fair value on a recurring basis        
Other assets 49,869 13,209    
Fair value assets and liabilities measured on recurring basis - supplemental data        
Other assets 50,492 13,827    
Recurring | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 279,988 294,496    
Recurring | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 54,860 72,340    
Available-for-sale securities 126,089 126,390    
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 51,385 68,844    
Available-for-sale securities 112,459 113,301    
Recurring | Mortgage-backed securities, Residential - nonagency        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 2,290 2,166    
Available-for-sale securities 10,601 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 1,185 1,330    
Available-for-sale securities 3,029 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 85,075 115,259    
Available-for-sale securities 194,784 201,951    
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 7,017 7,192    
Available-for-sale securities 19,922 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 1,584 1,230    
Recurring | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 0 0    
Recurring | Non-U.S. government debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 92,469 67,625    
Available-for-sale securities 20,873 22,928    
Recurring | Corporate debt securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 28,488 21,524    
Available-for-sale securities 210 216    
Recurring | Loans        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 7,903 6,994    
Recurring | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 2,592 2,332    
Recurring | Asset-backed securities, Collateralized loan obligations        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 11,329 10,048    
Recurring | Asset-backed securities, Other        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 6,735 6,249    
Recurring | Equity securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 155,154 100,163    
Recurring | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 17,083 11,571    
Recurring | Other        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 18,653 17,214    
Recurring | U.S. GSE obligations        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 96,300 117,600    
Recurring | Residential mortgage        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 20,100 15,100    
Recurring | Commercial mortgage        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 6,000 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 11,900 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 278,758 234,452    
Gross derivative receivables 3,790 2,464    
Trading assets 282,548 236,916    
Available-for-sale securities 207,057 215,093    
Loans 0 0    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 532,444 460,119    
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 104,557 82,669    
Gross derivative payables 3,348 2,628    
Trading liabilities 107,905 85,297    
Accounts payable and other liabilities 39,933 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 147,838 88,192    
Recurring | Level 1 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 3,646 2,318    
Gross derivative payables 3,194 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 144 146    
Gross derivative payables 154 132    
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 42,839 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 115,515 131,035    
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 3 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 3 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 74,980 104,263    
Available-for-sale securities 194,784 201,951    
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 | 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 40,535 26,772    
Available-for-sale securities 12,270 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 152,474 97,035    
Recurring | Level 1 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 10,769 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 267,613 238,015    
Securities borrowed 66,277 52,983    
Trading assets, debt and equity instruments 189,438 186,369    
Gross derivative receivables 598,051 697,422    
Trading assets 787,489 883,791    
Available-for-sale securities 172,885 173,085    
Loans 48,944 42,169    
Mortgage servicing rights 0 0    
Total assets measured at fair value on a recurring basis 1,349,727 1,394,604    
Deposits 11,455 11,571    
Federal funds purchased and securities loaned or sold under repurchase agreements 197,834 155,735    
Short-term borrowings 16,338 14,473    
Trading liabilities, Debt and equity instruments 26,292 16,838    
Gross derivative payables 566,334 673,598    
Trading liabilities 592,626 690,436    
Accounts payable and other liabilities 2,830 513    
Beneficial interests issued by consolidated VIEs 193 41    
Long-term debt 53,118 53,420    
Total liabilities measured at fair value on a recurring basis 874,394 926,189    
Recurring | Level 2 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 305,725 386,865    
Gross derivative payables 273,891 349,082    
Recurring | Level 2 | Credit        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 13,575 12,879    
Gross derivative payables 13,961 14,344    
Recurring | Level 2 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 185,794 205,127    
Gross derivative payables 184,124 214,373    
Recurring | Level 2 | Equity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 69,570 71,279    
Gross derivative payables 71,701 74,032    
Recurring | Level 2 | Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 23,387 21,272    
Gross derivative payables 22,657 21,767    
Recurring | Level 2 | Other assets        
Assets and liabilities measured at fair value on a recurring basis        
Other assets 6,519 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 162,601 161,363    
Recurring | Level 2 | Total mortgage-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 54,429 71,860    
Available-for-sale securities 126,086 126,383    
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 50,988 68,395    
Available-for-sale securities 112,456 113,294    
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 2,258 2,138    
Available-for-sale securities 10,601 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 1,183 1,327    
Available-for-sale securities 3,029 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 10,095 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 7,009 7,184    
Available-for-sale securities 19,922 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 1,584 1,230    
Recurring | Level 2 | Certificates of deposit        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 0 0    
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 51,757 40,671    
Available-for-sale securities 8,603 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 28,118 21,017    
Available-for-sale securities 210 216    
Recurring | Level 2 | Loans        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 7,071 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 2,538 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 11,329 10,048    
Recurring | Level 2 | Asset-backed securities, Other        
Assets and liabilities measured at fair value on a recurring basis        
Available-for-sale securities 6,735 6,249    
Recurring | Level 2 | Equity securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 1,992 2,652    
Recurring | Level 2 | Physical commodities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 6,314 5,189    
Recurring | Level 2 | Other        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 18,531 17,165    
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 2,682 2,623    
Gross derivative receivables 7,876 7,668    
Trading assets 10,558 10,291    
Available-for-sale securities 0 0    
Loans 1,823 2,305    
Mortgage servicing rights 4,470 3,276    
Total assets measured at fair value on a recurring basis 17,362 16,410    
Deposits 2,652 2,913    
Federal funds purchased and securities loaned or sold under repurchase agreements 0 0    
Short-term borrowings 3,664 2,420    
Trading liabilities, Debt and equity instruments 60 51    
Gross derivative payables 13,015 12,661    
Trading liabilities 13,075 12,712    
Accounts payable and other liabilities 61 68    
Beneficial interests issued by consolidated VIEs 0 0    
Long-term debt 22,575 23,397    
Total liabilities measured at fair value on a recurring basis 42,027 41,510    
Recurring | Level 3 | Interest rate        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 2,250 2,307    
Gross derivative payables 2,101 2,049    
Recurring | Level 3 | Credit        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 637 624    
Gross derivative payables 641 848    
Recurring | Level 3 | Foreign exchange        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 689 987    
Gross derivative payables 1,228 1,421    
Recurring | Level 3 | Equity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 4,008 3,519    
Gross derivative payables 7,842 7,381    
Recurring | Level 3 | Commodity        
Assets and liabilities measured at fair value on a recurring basis        
Gross derivative receivables 292 231    
Gross derivative payables 1,203 962    
Recurring | Level 3 | Other assets        
Assets and liabilities measured at fair value on a recurring basis        
Other assets 511 538    
Recurring | Level 3 | Total debt instruments        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 1,872 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 431 480    
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 397 449    
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 32 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 2 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 8 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 | 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 177 182    
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 0 0    
Recurring | Level 3 | Loans        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 832 893    
Recurring | Level 3 | Asset-backed securities        
Assets and liabilities measured at fair value on a recurring basis        
Trading assets, debt and equity instruments 54 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 688 476    
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 $ 122 $ 49