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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 147 $ 638 $ 744 $ 649
Total gains/(losses) included in earnings, assets 22 35 31 27
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (5) (4) (611) (7)
Sales, assets (14) 0 (14) 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 150 669 150 669
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 22 33 32 26
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0 0 0 0
Beginning balance, fair value liabilities 385 424 462 500
Total (gains)/losses included in earnings, liabilities 24 15 39 (4)
Unrealized (gains)/losses included in OCI, liabilities (6) (4) (20) (51)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (3) (3) (81) (13)
Sales, liabilities (5) 0 (5) 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 395 432 395 432
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities 22 14 19 (7)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held (5) (4) (1) (50)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 124 98 120 136
Total gains/(losses) included in earnings, assets 24 22 34 (13)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (5) (4) (11) (7)
Sales, assets (14) 0 (14) 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 129 116 129 116
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 24 20 31 (14)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0 0 0 0
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   506 604 486
Total gains/(losses) included in earnings, assets   18 (4) 38
Unrealized gains/(losses) included in OCI, assets   0 0 0
Purchases, assets   0 0 0
Issuances, assets   0 0 0
Settlements, assets   0 (600) 0
Sales, assets   0 0 0
Transfers into level 3, assets   0 0 0
Transfers out of level 3, assets   0 0 0
Ending balance, fair value assets 0 524 0 524
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   18 0 38
Change in unrealized gains/(losses) for the period included in OCI for Assets still held   0 0 0
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   1   1
Total 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   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   1   1
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 Assets still held   0   0
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 105 98 110 108
Total (gains)/losses included in earnings, liabilities (2) (1) (9) 1
Unrealized (gains)/losses included in OCI, liabilities 2 (1) 4 (13)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 105 96 105 96
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities (2) (1) (9) 1
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held 2 (1) 4 (13)
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   8   7
Total (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   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   8
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   0
Other Derivatives Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   37 49 34
Total (gains)/losses included in earnings, liabilities   0 0 3
Unrealized (gains)/losses included in OCI, liabilities   0 0 0
Purchases, liabilities   0 0 0
Issuances, liabilities   0 0 0
Settlements, liabilities   0 (49) 0
Sales, liabilities   0 0 0
Transfers into Level 3, liabilities   0 0 0
Transfers out of Level 3, liabilities   0 0 0
Ending balance, fair value liabilities 0 37 0 37
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities   0 0 3
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held   0 0 0
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 280 281 303 347
Total (gains)/losses included in earnings, liabilities 26 16 48 (9)
Unrealized (gains)/losses included in OCI, liabilities (8) (3) (24) (38)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (3) (3) (32) (9)
Sales, liabilities (5) 0 (5) 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 290 291 290 291
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities 24 15 28 (12)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held (7) (3) (5) (37)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 9 18 6 8
Total gains/(losses) included in earnings, assets (1) (4) 2 6
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 8 14 8 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) (4) 2 6
Change in unrealized gains/(losses) for the period included in OCI for Assets still held 0 0 0 0
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14 15 14 18
Total gains/(losses) included in earnings, assets (1) (1) (1) (4)
Unrealized gains/(losses) included in OCI, assets 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 13 14 13 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) (1) $ (1) (4)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held $ 0 0   0
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities       4
Total (gains)/losses included in earnings, liabilities       0
Unrealized (gains)/losses included in OCI, liabilities       0
Purchases, liabilities       0
Issuances, liabilities       0
Settlements, liabilities       (4)
Sales, liabilities       0
Transfers into Level 3, liabilities       0
Transfers out of Level 3, liabilities       0
Ending balance, fair value liabilities   $ 0   0
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities       0
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held       $ 0