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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 2,117 $ 2,165 $ 2,140 $ 1,552
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets (8) 56 20 57
Unrealized gains/(losses) included in OCI, assets 0 0 0 2
Foreign exchange recognized in OCI or earnings, assets 3 (2) 0 (5)
Purchases, assets 2 0 5 719
Issuances, assets 0 0 0 0
Settlements, assets (41) (93) (90) (205)
Sales, assets (925) 0 (928) 0
Transfers into level 3, assets 3 10 6 18
Transfers out of level 3, assets (13) (14) (15) (16)
Ending balance, fair value assets 1,138 2,122 1,138 2,122
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (5) 54 9 52
Beginning balance, fair value liabilities 604 701 595 661
Realized gains/(losses), liabilities 29 3 56 34
Unrealized gains/(losses included in earnings, liabilities (31) 42 (46) 99
Unrealized gains/(losses) included in OCI, liabilities 24 0 41 0
Foreign exchange recognized in OCI or earnings, liabilities (18) 7 (8) 9
Purchases, liabilities 0 0 0 0
Issuances, liabilities 1 0 6 0
Settlements, liabilities (31) (55) (66) (105)
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 578 698 578 698
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (49) 49 (54) 108
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 737 844 759 916
Unrealized gains/(losses) included in earnings, assets (14) 31 6 27
Settlements, assets (40) (60) (82) (128)
Ending balance, fair value assets 683 815 683 815
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (14) 31 6 27
Corporate Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 925 872 920 150
Unrealized gains/(losses) included in earnings, assets   29 11 32
Purchases, assets       719
Settlements, assets   (26) (6) (26)
Sales, assets (925)   (925)  
Ending balance, fair value assets   875   875
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   29   32
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 407 409 407 404
Unrealized gains/(losses) included in earnings, assets 8 (2) 8 3
Ending balance, fair value assets 415 407 415 407
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 8 (2) 8 3
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1    
Transfers into level 3, assets       1
Transfers out of level 3, assets   (1)   (1)
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets     2 2
Settlements, assets       (1)
Transfers out of level 3, assets     (2) (1)
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 3 6    
Settlements, assets (1) (2) (1) (2)
Transfers into level 3, assets 3   6 6
Transfers out of level 3, assets   (4)   (4)
Ending balance, fair value assets 5   5  
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 7   7  
Transfers into level 3, assets   7   7
Transfers out of level 3, assets (7)   (7)  
Ending balance, fair value assets   7   7
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 6   6  
Transfers into level 3, assets   3   3
Transfers out of level 3, assets (6)   (6)  
Ending balance, fair value assets   3   3
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   13   15
Settlements, assets   (5)   (7)
Transfers out of level 3, assets   (8)   (8)
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
Ending balance, fair value assets 1 1 1 1
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 4 5 5 44
Unrealized gains/(losses) included in OCI, assets       2
Purchases, assets 2   5  
Settlements, assets     (1) (41)
Sales, assets     (3)  
Ending balance, fair value assets 6 5 6 5
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1   1
Transfers into level 3, assets       1
Transfers out of level 3, assets   (1)   (2)
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 146 104 115 101
Unrealized gains/(losses included in earnings, liabilities (1) 12   13
Unrealized gains/(losses) included in OCI, liabilities 15   40  
Foreign exchange recognized in OCI or earnings, liabilities (11) 7 (6) 9
Ending balance, fair value liabilities 149 123 149 123
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (12) 19 (6) 22
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 49 86 63 64
Realized gains/(losses), liabilities 25 3 44 34
Unrealized gains/(losses included in earnings, liabilities (18) (6) (32) 16
Settlements, liabilities (25) (3) (44) (34)
Ending balance, fair value liabilities 31 80 31 80
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (18) (6) (32) 16
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 4 20 4 20
Unrealized gains/(losses included in earnings, liabilities   18   18
Settlements, liabilities   (34)   (34)
Ending balance, fair value liabilities 4 4 4 4
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   18   18
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 400 491 406 476
Realized gains/(losses), liabilities 4   12  
Unrealized gains/(losses included in earnings, liabilities (12) 18 (16) 52
Unrealized gains/(losses) included in OCI, liabilities 9   1  
Foreign exchange recognized in OCI or earnings, liabilities (7)   (2)  
Issuances, liabilities 1   6  
Settlements, liabilities (6) (18) (18) (37)
Ending balance, fair value liabilities 389 491 389 491
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (19) 18 (18) 52
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 13 13 19 19
Unrealized gains/(losses) included in earnings, assets (2) (2) (5) (5)
Foreign exchange recognized in OCI or earnings, assets 3 (2)   (5)
Ending balance, fair value assets 14 9 14 9
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 $ (4) (5) $ (10)
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14   14  
Ending balance, fair value assets 14   14  
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 5   7  
Unrealized gains/(losses included in earnings, liabilities     2  
Settlements, liabilities     (4)  
Ending balance, fair value liabilities $ 5   5  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities     $ 2