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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, 2020
Mar. 31, 2019
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 649 $ 637
Unrealized gains/(losses) included in earnings, assets (8) 42
Unrealized gains/(losses) included in OCI, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (3) (10)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 638 669
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (8) 42
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0  
Beginning balance, fair value liabilities 500 513
Unrealized gains/(losses included in earnings, liabilities (19) 36
Unrealized gains/(losses) included in OCI, liabilities (48) (11)
Purchases, liabilities 0 0
Issuances, liabilities 0 5
Settlements, liabilities (9) (11)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 424 532
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (22) 26
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held (46)  
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 136 172
Unrealized gains/(losses) included in earnings, assets (35) 42
Unrealized gains/(losses) included in OCI, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (3) (8)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 98 206
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (35) 42
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0  
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 486 418
Unrealized gains/(losses) included in earnings, assets 20 2
Unrealized gains/(losses) included in OCI, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 506 420
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 20 2
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0  
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   5
Unrealized gains/(losses) included in earnings, assets   0
Unrealized gains/(losses) included in OCI, assets   0
Purchases, assets   0
Issuances, assets   0
Settlements, assets   0
Sales, assets   0
Transfers into level 3, assets   0
Transfers out of level 3, assets   0
Ending balance, fair value assets   5
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   7
Unrealized gains/(losses) included in earnings, assets   0
Unrealized gains/(losses) included in OCI, assets   0
Purchases, assets   0
Issuances, assets   0
Settlements, assets   (1)
Sales, assets   0
Transfers into level 3, assets   0
Transfers out of level 3, assets   0
Ending balance, fair value assets   6
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   1
Unrealized gains/(losses) included in earnings, assets   0
Unrealized gains/(losses) included in OCI, assets   0
Purchases, assets   0
Issuances, assets   0
Settlements, assets   0
Sales, assets   0
Transfers into level 3, assets   0
Transfers out of level 3, assets   0
Ending balance, fair value assets   1
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1 3
Unrealized gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 (1)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 1 2
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0  
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 108 102
Unrealized gains/(losses included in earnings, liabilities 2 8
Unrealized gains/(losses) included in OCI, liabilities (12) (4)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 98 106
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 7
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held (12)  
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 7 33
Unrealized gains/(losses included in earnings, liabilities 1 (14)
Unrealized gains/(losses) included in OCI, liabilities 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 8 19
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 (14)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held 0  
Other Derivatives Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 34 7
Unrealized gains/(losses included in earnings, liabilities 3 0
Unrealized gains/(losses) included in OCI, liabilities 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 0
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 37 7
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 3  
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held 0  
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 347 366
Unrealized gains/(losses included in earnings, liabilities (25) 41
Unrealized gains/(losses) included in OCI, liabilities (36) (7)
Purchases, liabilities 0 0
Issuances, liabilities 0 5
Settlements, liabilities (5) (8)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 281 397
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (28) 32
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held (34)  
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 8 17
Unrealized gains/(losses) included in earnings, assets 10 (3)
Unrealized gains/(losses) included in OCI, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 18 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 10 (3)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0  
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 18 14
Unrealized gains/(losses) included in earnings, assets (3) 1
Unrealized gains/(losses) included in OCI, assets 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 15 15
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (3) 1
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0  
Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 4 5
Unrealized gains/(losses included in earnings, liabilities 0 1
Unrealized gains/(losses) included in OCI, liabilities 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (4) (3)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 0 3
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 $ 1
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held $ 0