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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 1,138 $ 2,122 $ 2,140 $ 1,552
Realized gains/(losses), assets 0 0 0 0
Unrealized gains/(losses) included in earnings, assets 23 8 43 65
Unrealized gains/(losses) included in OCI, assets 0 0 0 2
Foreign exchange recognized in OCI or earnings, assets (2) 1 (2) (4)
Purchases, assets 0 17 5 736
Issuances, assets 0 0 0 0
Settlements, assets (24) (64) (115) (268)
Sales, assets (251) (3) (1,178) (3)
Transfers into level 3, assets 7 0 13 18
Transfers out of level 3, assets (2) (7) (17) (24)
Ending balance, fair value assets 889 2,074 889 2,074
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 22 9 27 61
Beginning balance, fair value liabilities 578 698 595 661
Realized gains/(losses), liabilities 11 7 66 41
Unrealized gains/(losses included in earnings, liabilities 1 (2) (44) 98
Unrealized gains/(losses) included in OCI, liabilities 0 0 41 0
Foreign exchange recognized in OCI or earnings, liabilities 4 5 (4) 13
Purchases, liabilities 0 6 0 6
Issuances, liabilities 1 0 7 0
Settlements, liabilities (51) (21) (117) (126)
Sales, liabilities 0 (51) 0 (51)
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 544 642 544 642
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 5 3 (48) 113
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 683 815 759 916
Unrealized gains/(losses) included in earnings, assets 20 2 26 29
Settlements, assets (24) (58) (106) (186)
Sales, assets (251)   (251)  
Ending balance, fair value assets 428 759 428 759
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 21 2 23 29
Corporate Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   875 920 150
Unrealized gains/(losses) included in earnings, assets   4 11 36
Purchases, assets       719
Settlements, assets   (6) (6) (32)
Sales, assets     (925)  
Ending balance, fair value assets   873   873
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   4   36
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 415 407 407 404
Unrealized gains/(losses) included in earnings, assets   (1) 8 2
Ending balance, fair value assets 415 406 415 406
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1) 8 2
State and municipal bonds [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Transfers into level 3, assets       1
Transfers out of level 3, assets       (1)
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets     2 2
Transfers out of level 3, assets     (2) (2)
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 5      
Settlements, assets     (1) (2)
Transfers into level 3, assets     6 6
Transfers out of level 3, assets       (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 7
Transfers out of level 3, assets   (7) (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   3 6  
Sales, assets   (3)   (3)
Transfers into level 3, assets       3
Transfers out of level 3, assets     (6)  
Collateralized Debt Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       15
Settlements, assets       (7)
Transfers out of level 3, assets       (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 6 5 5 44
Unrealized gains/(losses) included in OCI, assets       2
Purchases, assets     5  
Settlements, assets     (2) (41)
Sales, assets     (2)  
Transfers out of level 3, assets (2)   (2)  
Ending balance, fair value assets 4 5 4 5
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [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       (2)
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 149 123 115 101
Realized gains/(losses), liabilities (5)   (5)  
Unrealized gains/(losses included in earnings, liabilities (1) (1) (1) 13
Unrealized gains/(losses) included in OCI, liabilities 11   51  
Foreign exchange recognized in OCI or earnings, liabilities (1) 5 (7) 13
Settlements, liabilities (30)   (30)  
Ending balance, fair value liabilities 123 127 123 127
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (2) 4 (8) 26
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 31 80 63 64
Realized gains/(losses), liabilities 6 7 49 41
Unrealized gains/(losses included in earnings, liabilities (4) (6) (36) 10
Settlements, liabilities (6) (7) (49) (41)
Ending balance, fair value liabilities 27 74 27 74
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (4) (6) (36) 12
Other Derivative Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 4 4 4 20
Unrealized gains/(losses included in earnings, liabilities 3   3 18
Settlements, liabilities       (34)
Ending balance, fair value liabilities 7 4 7 4
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 3   3 18
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 389 491 406 476
Realized gains/(losses), liabilities 10   22  
Unrealized gains/(losses included in earnings, liabilities 3 4 (12) 56
Unrealized gains/(losses) included in OCI, liabilities (11)   (10)  
Foreign exchange recognized in OCI or earnings, liabilities 5   3  
Issuances, liabilities 1   7  
Settlements, liabilities (15) (14) (34) (51)
Sales, liabilities   (51)   (51)
Ending balance, fair value liabilities 382 430 382 430
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 8 4 (9) 56
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14 9 19 19
Unrealized gains/(losses) included in earnings, assets 2 3 (3) (2)
Foreign exchange recognized in OCI or earnings, assets (2) 1 (2) (4)
Ending balance, fair value assets 14 13 14 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   4 (5) (6)
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14   14  
Unrealized gains/(losses) included in earnings, assets 1   1  
Purchases, assets   17   17
Ending balance, fair value assets 15 17 15 17
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1   1  
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 5   7  
Unrealized gains/(losses included in earnings, liabilities   1 2 1
Purchases, liabilities   6   6
Settlements, liabilities     (4)  
Ending balance, fair value liabilities $ 5 7 5 7
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   $ 1 $ 2 $ 1