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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, 2018
Mar. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 2,140 $ 1,552
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 28 1
Unrealized gains/(losses) included in OCI, assets 0 2
Foreign exchange recognized in OCI or earnings, assets (3) (3)
Purchases, assets 2 719
Issuances, assets 0 0
Settlements, assets (49) (111)
Sales, assets (2) 0
Transfers into level 3, assets 3 8
Transfers out of level 3, assets (2) (3)
Ending balance, fair value assets 2,117 2,165
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 25 (1)
Beginning balance, fair value liabilities 595 661
Realized gains/(losses), liabilities 27 31
Unrealized gains/(losses included in earnings, liabilities (15) 57
Unrealized gains/(losses) included in OCI, liabilities 17 0
Foreign exchange recognized in OCI or earnings, liabilities 11 2
Purchases, liabilities 0 0
Issuances, liabilities 5 0
Settlements, liabilities (36) (50)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 604 701
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (4) 59
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 759 916
Unrealized gains/(losses) included in earnings, assets 20 (4)
Settlements, assets (42) (68)
Ending balance, fair value assets 737 844
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 20 (3)
Corporate Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 920 150
Unrealized gains/(losses) included in earnings, assets 11 3
Purchases, assets   719
Settlements, assets (6)  
Ending balance, fair value assets 925 872
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 11 3
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 407 404
Unrealized gains/(losses) included in earnings, assets   5
Ending balance, fair value assets 407 409
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   5
State and municipal bonds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Transfers into level 3, assets   1
Ending balance, fair value 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]    
Transfers into level 3, assets 3 6
Ending balance, fair value assets 3 6
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 7  
Ending balance, fair value assets 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  
Ending balance, fair value assets 6  
Collateralized Debt Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   15
Settlements, assets   (2)
Ending balance, fair value assets   13
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1 1
Ending balance, fair value assets 1 1
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 5 44
Unrealized gains/(losses) included in OCI, assets   2
Purchases, assets 2  
Settlements, assets (1) (41)
Sales, assets (2)  
Ending balance, fair value assets 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   (1)
Ending balance, fair value assets   1
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 115 101
Unrealized gains/(losses included in earnings, liabilities   1
Unrealized gains/(losses) included in OCI, liabilities 25  
Foreign exchange recognized in OCI or earnings, liabilities 6 2
Ending balance, fair value liabilities 146 104
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 6 3
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 63 64
Realized gains/(losses), liabilities 19 31
Unrealized gains/(losses included in earnings, liabilities (14) 22
Settlements, liabilities (19) (31)
Ending balance, fair value liabilities 49 86
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (14) 22
Other Derivative Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 4 20
Ending balance, fair value liabilities 4 20
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 406 476
Realized gains/(losses), liabilities 8  
Unrealized gains/(losses included in earnings, liabilities (3) 34
Unrealized gains/(losses) included in OCI, liabilities (8)  
Foreign exchange recognized in OCI or earnings, liabilities 5  
Issuances, liabilities 5  
Settlements, liabilities (13) (19)
Ending balance, fair value liabilities 400 491
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 34
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 19 19
Unrealized gains/(losses) included in earnings, assets (3) (3)
Foreign exchange recognized in OCI or earnings, assets (3) (3)
Ending balance, fair value assets 13 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (6) $ (6)
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 14  
Ending balance, fair value assets 14  
Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 7  
Unrealized gains/(losses included in earnings, liabilities 2  
Settlements, liabilities (4)  
Ending balance, fair value liabilities 5  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities $ 2