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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) - Fair Value Inputs Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 2,165 $ 1,850 $ 1,552 $ 1,834
Realized gains/(losses), assets 0 0 0 (1)
Unrealized gains/(losses) included in earnings, assets 56 (9) 57 (38)
Unrealized gains/(losses) included in OCI, assets 0 19 2 25
Foreign exchange recognized in OCI or earnings, assets (2) 0 (5) 0
Purchases, assets 0 127 719 272
Issuances, assets 0 0 0 0
Settlements, assets (93) (77) (205) (177)
Sales, assets 0 (107) 0 (107)
Transfers into level 3, assets [1] 10 4 18 9
Transfers out of level 3, assets [1] (14) 0 (16) (10)
Ending balance, fair value assets 2,122 1,807 2,122 1,807
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 54 (9) 52 (27)
Beginning balance, fair value liabilities 701 1,459 661 1,531
Realized gains/(losses), liabilities 3 2 34 16
Unrealized gains/(losses included in earnings, liabilities 42 (15) 99 (26)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 7 (4) 9 4
Purchases, liabilities 0 0 0 9
Issuances, liabilities 0 0 0 0
Settlements, liabilities (55) (2) (105) (94)
Sales, liabilities 0 (631) 0 (631)
Transfers into Level 3, liabilities [1] 0 0 0 0
Transfers out of Level 3, liabilities [1] 0 0 0 0
Ending balance, fair value liabilities 698 809 698 809
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 49 (19) 108 (20)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 844 1,115 916 1,185
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 31 (16) 27 (30)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (60) (54) (128) (110)
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 815 1,045 815 1,045
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 31 (16) 27 (30)
Corporate Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 872 253 150 107
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 29 1 32 1
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 719 146
Issuances, assets 0 0 0 0
Settlements, assets (26) 0 (26) 0
Sales, assets 0 (107) 0 (107)
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 875 147 875 147
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 29 1 32 1
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 409 399 404 396
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets (2) 2 3 5
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 407 401 407 401
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (2) 2 3 5
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 3 0 41
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 121 0 121
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 (38)
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 1 0
Transfers out of level 3, assets [1] (1) 0 (1) 0
Ending balance, fair value assets 0 124 0 124
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Foreign Government Debt [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 0 2 0 2
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 5 0 5
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 0 7 0 7
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 0 1 2 7
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 1 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 (1) 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 (1) (5)
Ending balance, fair value assets 0 2 0 2
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 6 1 0 11
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 (5)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (2) 0 (2) 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 2 6 2
Transfers out of level 3, assets [1] (4) 0 (4) (5)
Ending balance, fair value assets 0 3 0 3
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   0 0 0
Realized gains/(losses), assets   0 0 0
Unrealized gains/(losses) included in earnings, assets   0 0 0
Unrealized gains/(losses) included in OCI, assets   0 0 0
Foreign exchange recognized in OCI or earnings, assets   0 0 0
Purchases, assets   0 0 0
Issuances, assets   0 0 0
Settlements, assets   0 0 0
Sales, assets   0 0 0
Transfers into level 3, assets [1]   1 0 1
Transfers out of level 3, assets [1]   0 0 0
Ending balance, fair value assets   1   1
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0 0 0
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 0   0 0
Realized gains/(losses), assets 0   0 0
Unrealized gains/(losses) included in earnings, assets 0   0 0
Unrealized gains/(losses) included in OCI, assets 0   0 0
Foreign exchange recognized in OCI or earnings, assets 0   0 0
Purchases, assets 0   0 0
Issuances, assets 0   0 0
Settlements, assets 0   0 0
Sales, assets 0   0 0
Transfers into level 3, assets [1] 7   7 0
Transfers out of level 3, assets [1] 0   0 0
Ending balance, fair value assets 7   7  
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0   0 0
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 0 2 0 0
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 3 0 3 2
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 3 2 3 2
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 13 26 15 29
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets 0 17 0 18
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (5) (23) (7) (27)
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] (8) 0 (8) 0
Ending balance, fair value assets 0 20 0 20
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 1 1 1
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 1 1 1 1
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5 39 44 38
Realized gains/(losses), assets 0 0 0 (1)
Unrealized gains/(losses) included in earnings, assets 0 0 0 (1)
Unrealized gains/(losses) included in OCI, assets 0 2 2 7
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 (41) (2)
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 5 41 5 41
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 (1)
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 3 1 6
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 0 0 0 (6)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 1 1 4
Transfers out of level 3, assets [1] (1) 0 (2) 0
Ending balance, fair value assets 0 4 0 4
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 104 165 101 161
Realized gains/(losses), liabilities 0 0 0 0
Unrealized gains/(losses included in earnings, liabilities 12 0 13 (4)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 7 (4) 9 4
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities [1] 0 0 0 0
Transfers out of Level 3, liabilities [1] 0 0 0 0
Ending balance, fair value liabilities 123 161 123 161
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 19 (4) 22 0
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 86 99 64 85
Realized gains/(losses), liabilities 3 2 34 16
Unrealized gains/(losses included in earnings, liabilities (6) 5 16 19
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 0 0 0
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (3) (2) (34) (16)
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities [1] 0 0 0 0
Transfers out of Level 3, liabilities [1] 0 0 0 0
Ending balance, fair value liabilities 80 104 80 104
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (6) 5 16 22
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 20 19 20 18
Realized gains/(losses), liabilities 0 0 0 0
Unrealized gains/(losses included in earnings, liabilities 18 2 18 3
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 0 0 0
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (34) 0 (34) 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities [1] 0 0 0 0
Transfers out of Level 3, liabilities [1] 0 0 0 0
Ending balance, fair value liabilities 4 21 4 21
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 18 2 18 3
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 491 1,176 476 1,267
Realized gains/(losses), liabilities 0 0 0 0
Unrealized gains/(losses included in earnings, liabilities 18 (22) 52 (44)
Unrealized gains/(losses) included in OCI, liabilities 0 0 0 0
Foreign exchange recognized in OCI or earnings, liabilities 0 0 0 0
Purchases, liabilities 0 0 0 9
Issuances, liabilities 0 0 0 0
Settlements, liabilities (18) 0 (37) (78)
Sales, liabilities 0 (631) 0 (631)
Transfers into Level 3, liabilities [1] 0 0 0 0
Transfers out of Level 3, liabilities [1] 0 0 0 0
Ending balance, fair value liabilities 491 523 491 523
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 18 (22) 52 (45)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 13 5 19 11
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets (2) 4 (5) (2)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Foreign exchange recognized in OCI or earnings, assets (2) 0 (5) 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets [1] 0 0 0 0
Transfers out of level 3, assets [1] 0 0 0 0
Ending balance, fair value assets 9 9 9 9
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ (4) $ 4 $ (10) $ (2)
[1]
Transferred in and out at the end of the period.