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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, 2015
Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 2,097 $ 2,352
Realized gains/(losses), assets (2) 0
Unrealized gains/(losses) included in earnings, assets 11 15
Unrealized gains/(losses) included in OCI, assets (2) 31
Foreign exchange recognized in OCI or earnings, assets 6 (1)
Purchases, assets 157 26
Issuances, assets   0
Settlements, assets (318) (316)
Sales, assets (32) (110)
Transfers into level 3, assets 43 240
Transfers out of level 3, assets (126) (140)
Ending balance, fair value assets 1,834 2,097
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 14 51
Beginning balance, fair value liabilities 1,200 2,301
Realized gains/(losses), liabilities 28 445
Unrealized gains/(losses included in earnings, liabilities (186) (848)
Unrealized gains/(losses) included in OCI, liabilities 0 0
Foreign exchange recognized in OCI or earnings, liabilities (20) (32)
Purchases, liabilities 695 0
Issuances, liabilities 0 3
Settlements, liabilities (186) (626)
Sales, liabilities [1] 0 (43)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 1,531 1,200
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (192) (1)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1,431 1,612
Unrealized gains/(losses) included in earnings, assets (13) 39
Settlements, assets (233) (220)
Ending balance, fair value assets 1,185 1,431
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (13) 39
Other Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0  
Unrealized gains/(losses) included in earnings, assets (1)  
Purchases, assets 108  
Ending balance, fair value assets 107 0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1)  
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 379 359
Unrealized gains/(losses) included in earnings, assets 17 20
Ending balance, fair value assets 396 379
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 17 20
State and municipal bonds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 8 19
Unrealized gains/(losses) included in OCI, assets   3
Purchases, assets 45  
Settlements, assets (10) (4)
Sales, assets   (4)
Transfers into level 3, assets   46
Transfers out of level 3, assets (2) (52)
Ending balance, fair value assets 41 8
Foreign Government Debt [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 6 12
Foreign exchange recognized in OCI or earnings, assets (1)  
Settlements, assets   (15)
Sales, assets (3)  
Transfers into level 3, assets   9
Ending balance, fair value assets 2 6
Corporate Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 10 48
Realized gains/(losses), assets   2
Unrealized gains/(losses) included in earnings, assets   3
Unrealized gains/(losses) included in OCI, assets   (3)
Foreign exchange recognized in OCI or earnings, assets   (1)
Purchases, assets   10
Settlements, assets   (7)
Sales, assets   (48)
Transfers into level 3, assets 20 7
Transfers out of level 3, assets (23) (1)
Ending balance, fair value assets 7 10
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 55 48
Unrealized gains/(losses) included in earnings, assets (4) (10)
Settlements, assets (5) (5)
Sales, assets   (3)
Transfers into level 3, assets 6 25
Transfers out of level 3, assets (41)  
Ending balance, fair value assets 11 55
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0
Residential Mortgage Backed Agency [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   0
Settlements, assets   (8)
Transfers into level 3, assets   37
Transfers out of level 3, assets   (29)
Residential Mortgage Backed Non Agency [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   6
Unrealized gains/(losses) included in OCI, assets   (1)
Transfers out of level 3, assets   (5)
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 4
Unrealized gains/(losses) included in earnings, assets 1 (1)
Settlements, assets (1) (1)
Transfers into level 3, assets 2 2
Transfers out of level 3, assets (5) (1)
Ending balance, fair value assets 0 3
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 2 14
Settlements, assets   (14)
Transfers into level 3, assets 0 3
Transfers out of level 3, assets (2) (1)
Ending balance, fair value assets 0 2
Commercial Mortgage Backed Securities [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   (3)
Collateralized Debt Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 87 82
Realized gains/(losses), assets   (2)
Unrealized gains/(losses) included in earnings, assets   1
Unrealized gains/(losses) included in OCI, assets 3 28
Purchases, assets   5
Settlements, assets (50) (15)
Sales, assets (8) (41)
Transfers into level 3, assets 1 36
Transfers out of level 3, assets (4) (7)
Ending balance, fair value assets 29 87
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 5 22
Unrealized gains/(losses) included in earnings, assets 5 (10)
Settlements, assets (1) (5)
Transfers into level 3, assets 1 1
Transfers out of level 3, assets (9) (3)
Ending balance, fair value assets 1 5
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   1
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 85 58
Realized gains/(losses), assets (2)  
Unrealized gains/(losses) included in OCI, assets (5) 4
Purchases, assets 4 11
Settlements, assets (9) (12)
Sales, assets (21) (1)
Transfers into level 3, assets 12 52
Transfers out of level 3, assets (26) (27)
Ending balance, fair value assets 38 85
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 26 54
Unrealized gains/(losses) included in earnings, assets 2 (26)
Settlements, assets (9) (10)
Transfers into level 3, assets 1 18
Transfers out of level 3, assets (14) (10)
Ending balance, fair value assets 6 26
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (9)
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 197 203
Unrealized gains/(losses included in earnings, liabilities (16) 20
Foreign exchange recognized in OCI or earnings, liabilities (20) (26)
Ending balance, fair value liabilities 161 197
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (36) (6)
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 244 1,147
Realized gains/(losses), liabilities 28 415
Unrealized gains/(losses included in earnings, liabilities (159) (903)
Settlements, liabilities (28) (415)
Ending balance, fair value liabilities 85 244
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (145) (20)
Other Derivative Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 24 0
Realized gains/(losses), liabilities   30
Unrealized gains/(losses included in earnings, liabilities (6) (6)
Ending balance, fair value liabilities 18 24
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (6) (6)
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated Vies [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 735 940
Unrealized gains/(losses included in earnings, liabilities (5) 46
Purchases, liabilities 695  
Issuances, liabilities   3
Settlements, liabilities (158) (211)
Sales, liabilities   (43)
Ending balance, fair value liabilities 1,267 735
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (5) 42
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0  
Unrealized gains/(losses) included in earnings, assets 4  
Foreign exchange recognized in OCI or earnings, assets 7  
Ending balance, fair value assets 11 0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ 11  
Currency Derivatives [Member] | Liabilities Of Consolidated Vies [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities   11
Unrealized gains/(losses included in earnings, liabilities   (5)
Foreign exchange recognized in OCI or earnings, liabilities   (6)
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   (11)
Perpetual Debt And Equity Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   11
Unrealized gains/(losses) included in earnings, assets   2
Sales, assets   (13)
Transfers into level 3, assets   4
Transfers out of level 3, assets   (4)
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   $ 0
[1] Primarily relates to the deconsolidation of VIEs.