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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
Mar. 31, 2016
Mar. 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 (29) 10
Unrealized gains/(losses) included in OCI, assets 5 (1)
Foreign exchange recognized in OCI or earnings, assets 0 1
Purchases, assets 146 112
Issuances, assets 0 0
Settlements, assets (99) (68)
Sales, assets 0 (16)
Transfers into level 3, assets [1] 5 0
Transfers out of level 3, assets [1] (11) (11)
Ending balance, fair value assets 1,850 2,122
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (18) 12
Beginning balance, fair value liabilities 1,531 1,200
Realized gains/(losses), liabilities 14 9
Unrealized gains/(losses included in earnings, liabilities (10) (27)
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities 7 (22)
Purchases, liabilities 9 695
Issuances, liabilities 0 0
Settlements, liabilities (92) (60)
Sales, liabilities 0 0
Transfers into Level 3, liabilities [1] 0 0
Transfers out of Level 3, liabilities [1] 0 0
Ending balance, fair value liabilities 1,459 1,795
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 (49)
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 (14) (3)
Settlements, assets (56) (56)
Ending balance, fair value assets 1,115 1,372
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (14) (3)
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 107  
Purchases, assets 146 108
Ending balance, fair value assets 253 108
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 3 6
Ending balance, fair value assets 399 385
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 3 6
State and municipal bonds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 41 8
Settlements, assets (38)  
Transfers out of level 3, assets   (2)
Ending balance, fair value assets 3 6
Foreign Government Debt [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 2 6
Ending balance, fair value assets 2 6
Corporate Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 7 10
Transfers out of level 3, assets [1] (6)  
Ending balance, fair value assets 1 10
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 (5)  
Settlements, assets   (2)
Transfers out of level 3, assets (5)  
Ending balance, fair value assets 1 53
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
Settlements, assets   (1)
Ending balance, fair value assets   3
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   1
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   2
Transfers out of level 3, assets   (1)
Ending balance, fair value assets   1
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Transfers into level 3, assets 2  
Ending balance, fair value assets 2  
Collateralized Debt Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 29 87
Settlements, assets (3) (5)
Sales, assets   (8)
Ending balance, fair value assets 26 74
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   (1)
Ending balance, fair value assets 1 4
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 5 (1)
Purchases, assets   4
Settlements, assets (2) (2)
Sales, assets   (8)
Transfers out of level 3, assets [1]   (2)
Ending balance, fair value assets 39 74
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 (6) 3
Settlements, assets   (2)
Transfers into level 3, assets 3  
Transfers out of level 3, assets   (6)
Ending balance, fair value assets 3 21
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   3
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) 5
Foreign exchange recognized in OCI or earnings, liabilities 7 (22)
Ending balance, fair value liabilities 165 180
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 5 (17)
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 85 244
Realized gains/(losses), liabilities 14 9
Unrealized gains/(losses included in earnings, liabilities 14 (37)
Settlements, liabilities (14) (9)
Ending balance, fair value liabilities 99 207
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 16 (37)
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 1 (3)
Ending balance, fair value liabilities 19 21
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 (3)
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 (22) 8
Purchases, liabilities 9 695
Settlements, liabilities (78) (51)
Ending balance, fair value liabilities 1,176 1,387
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (22) 8
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 (6) 4
Foreign exchange recognized in OCI or earnings, assets   1
Ending balance, fair value assets 5 5
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ (6) $ 5
[1] (1) - Transferred in and out at the end of the period.