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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, 2019
Mar. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 637 $ 2,140
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 43 28
Unrealized gains/(losses) included in OCI, assets 0 0
Foreign exchange recognized in OCI or earnings, assets (1) (3)
Purchases, assets 0 2
Issuances, assets 0 0
Settlements, assets (10) (49)
Sales, assets 0 (2)
Transfers into level 3, assets 0 3
Transfers out of level 3, assets 0 (2)
Ending balance, fair value assets 669 2,117
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 42 25
Beginning balance, fair value liabilities 513 595
Realized gains/(losses), liabilities 9 27
Unrealized gains/(losses included in earnings, liabilities 29 (15)
Unrealized gains/(losses) included in OCI, liabilities (11) 17
Foreign exchange recognized in OCI or earnings, liabilities (2) 11
Purchases, liabilities 0 0
Issuances, liabilities 5 5
Settlements, liabilities (11) (36)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 532 604
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 26 (4)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 172 759
Unrealized gains/(losses) included in earnings, assets 42 20
Settlements, assets (8) (42)
Sales, assets 0  
Ending balance, fair value assets 206 737
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 42 20
Corporate Loans Receivable and Other Instruments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   920
Unrealized gains/(losses) included in earnings, assets   11
Settlements, assets   (6)
Ending balance, fair value assets   925
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   11
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 418 407
Unrealized gains/(losses) included in earnings, assets 2  
Ending balance, fair value assets 420 407
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2  
Corporate Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   2
Transfers out of level 3, assets   (2)
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 5  
Transfers into level 3, assets   3
Ending balance, fair value assets 5 3
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 7 7
Settlements, assets (1)  
Transfers into level 3, assets 0  
Ending balance, fair value assets 6 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] | 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 3 5
Purchases, assets   2
Settlements, assets (1) (1)
Sales, assets   (2)
Transfers out of level 3, assets 0  
Ending balance, fair value assets 2 4
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 102 115
Unrealized gains/(losses included in earnings, liabilities 10  
Unrealized gains/(losses) included in OCI, liabilities (4) 25
Foreign exchange recognized in OCI or earnings, liabilities (2) 6
Ending balance, fair value liabilities 106 146
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 7 6
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 33 63
Realized gains/(losses), liabilities   19
Unrealized gains/(losses included in earnings, liabilities (14) (14)
Settlements, liabilities   (19)
Ending balance, fair value liabilities 19 49
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (14) (14)
Other Derivative Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 7 4
Ending balance, fair value liabilities 7 4
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 366 406
Realized gains/(losses), liabilities 9 8
Unrealized gains/(losses included in earnings, liabilities 32 (3)
Unrealized gains/(losses) included in OCI, liabilities (7) (8)
Foreign exchange recognized in OCI or earnings, liabilities   5
Issuances, liabilities 5 5
Settlements, liabilities (8) (13)
Ending balance, fair value liabilities 397 400
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 32 2
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 17 19
Unrealized gains/(losses) included in earnings, assets (2) (3)
Foreign exchange recognized in OCI or earnings, assets (1) (3)
Ending balance, fair value assets 14 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (3) (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  
Ending balance, fair value assets 15 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 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
Settlements, liabilities (3) (4)
Ending balance, fair value liabilities 3 5
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities $ 1 $ 2