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Fair Value Disclosures (Rollforward of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - Level 3 - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Deposits    
Liabilities    
Beginning balance $ 47 $ 42
Realized and unrealized (gains) losses (1) 1
Purchases 0 0
Sales and Issuances 9 13
Settlements (1) 0
Net transfers (10) 0
Ending balance 44 56
Unrealized gains (losses) 1 (1)
Securities Sold Under Agreements to Repurchase    
Liabilities    
Beginning balance 150 149
Realized and unrealized (gains) losses 0 (1)
Purchases 0 0
Sales and Issuances 0 0
Settlements 0 0
Net transfers (150) 0
Ending balance 0 148
Unrealized gains (losses) 0 1
Other Secured Financings    
Liabilities    
Beginning balance 239 434
Realized and unrealized (gains) losses (13) 19
Purchases 0 0
Sales and Issuances 4 13
Settlements (10) (220)
Net transfers 0 (43)
Ending balance 220 203
Unrealized gains (losses) 13 (12)
Borrowings    
Liabilities    
Beginning balance 2,984 2,014
Realized and unrealized (gains) losses (102) 59
Purchases 0 0
Sales and Issuances 640 270
Settlements (83) (165)
Net transfers 187 (86)
Ending balance 3,626 2,092
Unrealized gains (losses) 99 (58)
Trading Assets | U.S. Treasury and Agency Securities    
Assets    
Beginning balance   74
Realized and unrealized gains (losses)   0
Purchases   42
Sales and issuances   (241)
Settlements   0
Net transfers   167
Ending balance   42
Unrealized gains (losses)   0
Trading Assets | Other Sovereign Government Obligations    
Assets    
Beginning balance 1 6
Realized and unrealized gains (losses) 0 0
Purchases 7 61
Sales and issuances 0 (2)
Settlements 0 0
Net transfers (1) 0
Ending balance 7 65
Unrealized gains (losses) 0 0
Trading Assets | State and Municipal Securities    
Assets    
Beginning balance 8 250
Realized and unrealized gains (losses) 0 0
Purchases 1 2
Sales and issuances (7) (2)
Settlements 0 0
Net transfers 0 (195)
Ending balance 2 55
Unrealized gains (losses) 0 0
Trading Assets | MABS    
Assets    
Beginning balance 423 217
Realized and unrealized gains (losses) 77 7
Purchases 64 39
Sales and issuances (238) (56)
Settlements (16) (11)
Net transfers 32 20
Ending balance 342 216
Unrealized gains (losses) 2 (1)
Trading Assets | Loans and Lending Commitments    
Assets    
Beginning balance 5,945 5,122
Realized and unrealized gains (losses) 28 53
Purchases 3,740 757
Sales and issuances (283) (555)
Settlements (1,218) (985)
Net transfers (84) 87
Ending balance 8,128 4,479
Unrealized gains (losses) (9) 39
Trading Assets | Corporate and Other Debt    
Assets    
Beginning balance 701 475
Realized and unrealized gains (losses) 1 21
Purchases 350 262
Sales and issuances (243) (142)
Settlements 0 (1)
Net transfers 5 102
Ending balance 814 717
Unrealized gains (losses) (1) 3
Trading Assets | Corporate Equities    
Assets    
Beginning balance 166 446
Realized and unrealized gains (losses) 0 (1)
Purchases 166 41
Sales and issuances (132) (105)
Settlements 0 0
Net transfers 33 (71)
Ending balance 233 310
Unrealized gains (losses) (9) 3
Trading Assets | Net Derivative and Other Contracts    
Assets    
Beginning balance 3,801 1,788
Realized and unrealized gains (losses) 575 (192)
Purchases 187 142
Sales and issuances (877) (178)
Settlements 92 230
Net transfers (496) (194)
Ending balance 3,282 1,596
Unrealized gains (losses) 421 (227)
Trading Assets | Net Derivative and Other Contracts | Interest Rate Contracts    
Assets    
Beginning balance 1,218 420
Realized and unrealized gains (losses) 52 (114)
Purchases 32 46
Sales and issuances (41) (24)
Settlements (81) 16
Net transfers (510) (46)
Ending balance 670 298
Unrealized gains (losses) 75 (127)
Trading Assets | Net Derivative and Other Contracts | Credit Contracts    
Assets    
Beginning balance 41 (373)
Realized and unrealized gains (losses) (107) (25)
Purchases 0 6
Sales and issuances 0 (5)
Settlements 38 41
Net transfers (2) 5
Ending balance (30) (351)
Unrealized gains (losses) (109) (33)
Trading Assets | Net Derivative and Other Contracts | Foreign Exchange Contracts    
Assets    
Beginning balance (112) (43)
Realized and unrealized gains (losses) 57 (36)
Purchases 0 1
Sales and issuances (31) 0
Settlements 33 11
Net transfers 20 (4)
Ending balance (33) (71)
Unrealized gains (losses) (9) (20)
Trading Assets | Net Derivative and Other Contracts | Equity Contracts    
Assets    
Beginning balance 1,208 184
Realized and unrealized gains (losses) 356 (144)
Purchases 142 83
Sales and issuances (799) (121)
Settlements 159 231
Net transfers (51) (16)
Ending balance 1,015 217
Unrealized gains (losses) 315 (81)
Trading Assets | Net Derivative and Other Contracts | Commodity and Other Contracts    
Assets    
Beginning balance 1,446 1,600
Realized and unrealized gains (losses) 217 127
Purchases 13 6
Sales and issuances (6) (28)
Settlements (57) (69)
Net transfers 47 (133)
Ending balance 1,660 1,503
Unrealized gains (losses) 149 34
Trading Assets | Investments    
Assets    
Beginning balance 1,020 958
Realized and unrealized gains (losses) 44 8
Purchases 21 62
Sales and issuances (78) (3)
Settlements 0 (66)
Net transfers 5 2
Ending balance 1,012 961
Unrealized gains (losses) 22 8
Trading Liabilities | Other Sovereign Government Obligations    
Liabilities    
Beginning balance 0  
Realized and unrealized (gains) losses 0  
Purchases 0  
Sales and Issuances 3  
Settlements 0  
Net transfers 0  
Ending balance 3  
Unrealized gains (losses) 0  
Trading Liabilities | Corporate and Other Debt    
Liabilities    
Beginning balance 3 36
Realized and unrealized (gains) losses 0 1
Purchases (2) (119)
Sales and Issuances 1 101
Settlements 0 0
Net transfers 2 17
Ending balance 4 36
Unrealized gains (losses) 0 (1)
Trading Liabilities | Corporate Equities    
Liabilities    
Beginning balance 22 35
Realized and unrealized (gains) losses (4) (12)
Purchases (5) (68)
Sales and Issuances 11 26
Settlements 0 0
Net transfers 8 21
Ending balance 32 2
Unrealized gains (losses) $ 4 $ 0