Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Reconciliation (Details)

v3.8.0.1
Fair Value Measurements - Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance, beginning $ (1,714) $ (1,313)  
Total Realized/Unrealized Gains/(Losses) 495 (474)  
Gains (Losses) in OCI 0 0  
Purchases 153 200  
Sales (262) (247)  
Issuances 0 0  
Settlements 202 170  
Gross Transfers into Level 3 71 29  
Gross Transfers out of Level 3 (83) (30)  
Balance, ending (1,138) (1,665)  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 517 (489)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Gross Derivative Assets 360,400   $ 351,600
Gross Derivative Liabilities 340,900   346,000
Federal funds purchased and securities loaned or sold under agreements to repurchase      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning   (359)  
Total Realized/Unrealized Gains/(Losses)   1  
Gains (Losses) in OCI   0  
Purchases   0  
Sales   0  
Issuances   (2)  
Settlements   28  
Gross Transfers into Level 3   0  
Gross Transfers out of Level 3   106  
Balance, ending   (226)  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held   1  
Corporate securities, trading loans and other      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning (24) (27)  
Total Realized/Unrealized Gains/(Losses) 1 2  
Gains (Losses) in OCI 0 0  
Purchases 0 0  
Sales (2) (10)  
Issuances (1) 0  
Settlements 0 0  
Gross Transfers into Level 3 0 0  
Gross Transfers out of Level 3 0 0  
Balance, ending (26) (35)  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 1 2  
Accrued expenses and other liabilities      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning (8) (9)  
Total Realized/Unrealized Gains/(Losses) 0 0  
Gains (Losses) in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Gross Transfers into Level 3 0 0  
Gross Transfers out of Level 3 0 0  
Balance, ending (8) (9)  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 0 0  
Long-term debt      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning (1,863) (1,514)  
Total Realized/Unrealized Gains/(Losses) 23 (83)  
Gains (Losses) in OCI 1 7  
Purchases 5 11  
Sales 0 0  
Issuances (67) (130)  
Settlements 172 159  
Gross Transfers into Level 3 (33) (178)  
Gross Transfers out of Level 3 411 68  
Balance, ending (1,351) (1,660)  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 26 (83)  
Level 3 | Recurring      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance, beginning (1,714)    
Balance, ending (1,138)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Gross Derivative Assets 4,545 4,200 4,067
Gross Derivative Liabilities 5,683 5,800 $ 5,781
Corporate securities, trading loans and other      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 1,864 2,777  
Total Realized/Unrealized Gains/(Losses) 9 84  
Gains (Losses) in OCI 0 0  
Purchases 193 199  
Sales (136) (480)  
Issuances 0 0  
Settlements (139) (127)  
Gross Transfers into Level 3 103 75  
Gross Transfers out of Level 3 (178) (499)  
Balance, ending 1,716 2,029  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held (15) 56  
Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 235 281  
Total Realized/Unrealized Gains/(Losses) 8 12  
Gains (Losses) in OCI 0 0  
Purchases 6 20  
Sales (7) (17)  
Issuances 0 0  
Settlements 0 (10)  
Gross Transfers into Level 3 1 72  
Gross Transfers out of Level 3 (31) (70)  
Balance, ending 212 288  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 8 8  
Non-U.S. sovereign debt      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 556 510  
Total Realized/Unrealized Gains/(Losses) 16 19  
Gains (Losses) in OCI 2 10  
Purchases 0 0  
Sales (50) (9)  
Issuances 0 0  
Settlements (8) (6)  
Gross Transfers into Level 3 0 3  
Gross Transfers out of Level 3 (115) 0  
Balance, ending 401 527  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 16 19  
Mortgage trading loans, ABS and other MBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 1,498 1,211  
Total Realized/Unrealized Gains/(Losses) 99 107  
Gains (Losses) in OCI 3 0  
Purchases 125 339  
Sales (320) (375)  
Issuances 0 0  
Settlements (69) (54)  
Gross Transfers into Level 3 94 28  
Gross Transfers out of Level 3 (58) (41)  
Balance, ending 1,372 1,215  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 83 74  
Trading Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 4,153 4,779  
Total Realized/Unrealized Gains/(Losses) 132 222  
Gains (Losses) in OCI 5 10  
Purchases 324 558  
Sales (513) (881)  
Issuances 0 0  
Settlements (216) (197)  
Gross Transfers into Level 3 198 178  
Gross Transfers out of Level 3 (382) (610)  
Balance, ending 3,701 4,059  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 92 157  
Non-U.S. securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 25 229  
Total Realized/Unrealized Gains/(Losses) 0 0  
Gains (Losses) in OCI 0 3  
Purchases 0 20  
Sales 0 0  
Issuances 0 0  
Settlements (2) (45)  
Gross Transfers into Level 3 0 0  
Gross Transfers out of Level 3 0 0  
Balance, ending 23 207  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 0 0  
Other taxable securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 509 594  
Total Realized/Unrealized Gains/(Losses) 1 3  
Gains (Losses) in OCI 0 4  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (7) (22)  
Gross Transfers into Level 3 0 0  
Gross Transfers out of Level 3 (460) 0  
Balance, ending 43 579  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 0 0  
Tax-exempt securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 469 542  
Total Realized/Unrealized Gains/(Losses) 0 0  
Gains (Losses) in OCI 0 2  
Purchases 0 0  
Sales 0 (56)  
Issuances 0 0  
Settlements 0 (3)  
Gross Transfers into Level 3 0 35  
Gross Transfers out of Level 3 (469) 0  
Balance, ending 0 520  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 0 0  
Available-for-sale Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 1,003 1,365  
Total Realized/Unrealized Gains/(Losses) 1 3  
Gains (Losses) in OCI 0 9  
Purchases 0 20  
Sales 0 (56)  
Issuances 0 0  
Settlements (9) (70)  
Gross Transfers into Level 3 0 35  
Gross Transfers out of Level 3 (929) 0  
Balance, ending 66 1,306  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 0 0  
Other debt securities carried at fair value – Non-agency residential MBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning   25  
Total Realized/Unrealized Gains/(Losses)   (1)  
Gains (Losses) in OCI   0  
Purchases   0  
Sales   0  
Issuances   0  
Settlements   0  
Gross Transfers into Level 3   0  
Gross Transfers out of Level 3   0  
Balance, ending   24  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held   0  
Loans and leases      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 571 720  
Total Realized/Unrealized Gains/(Losses) (16) 12  
Gains (Losses) in OCI 0 0  
Purchases 0 0  
Sales (4) 0  
Issuances 0 0  
Settlements (25) (30)  
Gross Transfers into Level 3 0 0  
Gross Transfers out of Level 3 0 0  
Balance, ending 526 702  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held (16) 12  
Loans Held-for-Sale      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 690 656  
Total Realized/Unrealized Gains/(Losses) 24 29  
Gains (Losses) in OCI 0 6  
Purchases 12 0  
Sales 0 (136)  
Issuances 0 0  
Settlements (41) (60)  
Gross Transfers into Level 3 0 315  
Gross Transfers out of Level 3 0 (18)  
Balance, ending 685 792  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held 21 22  
Other assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning 2,425 2,986  
Total Realized/Unrealized Gains/(Losses) 192 (33)  
Gains (Losses) in OCI 0 0  
Purchases 0 0  
Sales (38) 5  
Issuances 29 75  
Settlements (242) (192)  
Gross Transfers into Level 3 929 0  
Gross Transfers out of Level 3 0 0  
Balance, ending 3,295 2,841  
Change in Unrealized Gains/(Losses) Related to Financial Instruments Still Held $ 120 $ (123)