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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 1,834 $ 2,097
Realized gains/(losses), assets (1) (2)
Unrealized gains/(losses) included in earnings, assets (16) 11
Unrealized gains/(losses) included in OCI, assets 32 (2)
Foreign exchange recognized in OCI or earnings, assets 5 6
Purchases, assets 278 157
Issuances, assets 0 0
Settlements, assets (344) (318)
Sales, assets (109) (32)
Transfers into level 3, assets 17 43
Transfers out of level 3, assets (144) (126)
Ending balance, fair value assets 1,552 1,834
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 8 14
Beginning balance, fair value liabilities 1,531 1,200
Realized gains/(losses), liabilities 43 28
Unrealized gains/(losses included in earnings, liabilities (45) (186)
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities (1) (20)
Purchases, liabilities 9 695
Issuances, liabilities 0 0
Settlements, liabilities (245) (186)
Sales, liabilities (631) 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 661 1,531
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (38) (192)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1,185 1,431
Unrealized gains/(losses) included in earnings, assets (11) (13)
Settlements, assets (258) (233)
Ending balance, fair value assets 916 1,185
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (11) (13)
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 107  
Unrealized gains/(losses) included in earnings, assets 4 (1)
Purchases, assets 146 108
Sales, assets (107)  
Ending balance, fair value assets 150 107
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 4 (1)
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 396 379
Unrealized gains/(losses) included in earnings, assets 8 17
Ending balance, fair value assets 404 396
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 8 17
State and municipal bonds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 41 8
Purchases, assets 122 45
Settlements, assets (39) (10)
Sales, assets (1)  
Transfers into level 3, assets 2  
Transfers out of level 3, assets (125) (2)
Ending balance, fair value assets   41
Foreign Government Debt [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 2 6
Foreign exchange recognized in OCI or earnings, assets (1) (1)
Purchases, assets 10  
Settlements, assets (10)  
Sales, assets   (3)
Transfers out of level 3, assets (1)  
Ending balance, fair value assets   2
Corporate Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 7 10
Transfers into level 3, assets 2 20
Transfers out of level 3, assets (7) (23)
Ending balance, fair value assets 2 7
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 11 55
Unrealized gains/(losses) included in earnings, assets (6) (4)
Settlements, assets (2) (5)
Transfers into level 3, assets 2 6
Transfers out of level 3, assets (5) (41)
Ending balance, fair value assets   11
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   3
Unrealized gains/(losses) included in earnings, assets (1) 1
Settlements, assets   (1)
Transfers into level 3, assets 1 2
Transfers out of level 3, assets   (5)
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   2
Sales, assets (1)  
Transfers into level 3, assets 1  
Transfers out of level 3, assets   (2)
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Unrealized gains/(losses) included in earnings, assets (4)  
Transfers into level 3, assets 4  
Collateralized Debt Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 29 87
Unrealized gains/(losses) included in OCI, assets 18 3
Settlements, assets (32) (50)
Sales, assets   (8)
Transfers into level 3, assets   1
Transfers out of level 3, assets   (4)
Ending balance, fair value assets 15 29
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1 5
Unrealized gains/(losses) included in earnings, assets   5
Settlements, assets   (1)
Transfers into level 3, assets   1
Transfers out of level 3, assets   (9)
Ending balance, fair value assets 1 1
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 38 85
Realized gains/(losses), assets (1) (2)
Unrealized gains/(losses) included in earnings, assets (1)  
Unrealized gains/(losses) included in OCI, assets 14 (5)
Purchases, assets   4
Settlements, assets (3) (9)
Sales, assets   (21)
Transfers into level 3, assets   12
Transfers out of level 3, assets (3) (26)
Ending balance, fair value assets 44 38
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1)  
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 6 26
Unrealized gains/(losses) included in earnings, assets (7) 2
Settlements, assets   (9)
Transfers into level 3, assets 5 1
Transfers out of level 3, assets (3) (14)
Ending balance, fair value assets 1 6
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 161 197
Unrealized gains/(losses included in earnings, liabilities (3) (16)
Foreign exchange recognized in OCI or earnings, liabilities (1) (20)
Settlements, liabilities (56)  
Ending balance, fair value liabilities 101 161
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (4) (36)
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 85 244
Realized gains/(losses), liabilities 43 28
Unrealized gains/(losses included in earnings, liabilities (21) (159)
Settlements, liabilities (43) (28)
Ending balance, fair value liabilities 64 85
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (13) (145)
Other Derivative Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 18 24
Unrealized gains/(losses included in earnings, liabilities 2 (6)
Ending balance, fair value liabilities 20 18
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 (6)
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 1,267 735
Unrealized gains/(losses included in earnings, liabilities (23) (5)
Purchases, liabilities 9 695
Settlements, liabilities (146) (158)
Sales, liabilities (631)  
Ending balance, fair value liabilities 476 1,267
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (23) (5)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 11  
Unrealized gains/(losses) included in earnings, assets 2 4
Foreign exchange recognized in OCI or earnings, assets 6 7
Ending balance, fair value assets 19 11
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ 8 $ 11