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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, 2021
Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 744 $ 649
Total gains/(losses) included in earnings, assets 8 (8)
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (605) (3)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 147 638
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 11 (8)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held [1] 0 0
Beginning balance, fair value liabilities 462 500
Total (gains)/losses included in earnings, liabilities 15 (19)
Unrealized (gains)/losses included in OCI, liabilities [2] (14) (48)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (78) (9)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 385 424
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities (3) (22)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [2] 5 (46)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 120 136
Total gains/(losses) included in earnings, assets 9 (35)
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (5) (3)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 124 98
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 8 (35)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held [1] 0 0
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 604 486
Total gains/(losses) included in earnings, assets (4) 20
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (600) 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 0 506
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 20
Change in unrealized gains/(losses) for the period included in OCI for Assets still held [1] 0 0
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   1
Total gains/(losses) included in earnings, assets   0
Unrealized gains/(losses) included in OCI, assets [1]   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
Change in unrealized gains/(losses) for the period included in OCI for Assets still held [1]   0
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 110 108
Total (gains)/losses included in earnings, liabilities (7) 2
Unrealized (gains)/losses included in OCI, liabilities [2] 2 (12)
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 105 98
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities (7) 2
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [2] 2 (12)
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities   7
Total (gains)/losses included in earnings, liabilities   1
Unrealized (gains)/losses included in OCI, liabilities [2]   0
Purchases, liabilities   0
Issuances, liabilities   0
Settlements, liabilities   0
Sales, liabilities   0
Transfers into Level 3, liabilities   0
Transfers out of Level 3, liabilities   0
Ending balance, fair value liabilities   8
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities   1
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [2]   0
Other Derivatives Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 49 34
Total (gains)/losses included in earnings, liabilities 0 3
Unrealized (gains)/losses included in OCI, liabilities [2] 0 0
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (49) 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 0 37
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities 0 3
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [2] 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 303 347
Total (gains)/losses included in earnings, liabilities 22 (25)
Unrealized (gains)/losses included in OCI, liabilities [2] (16) (36)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (29) (5)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 280 281
Change in unrealized (gains)/losses for the period included in earnings for liabilities still held, liabilities 4 (28)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [2] 3 (34)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 6 8
Total gains/(losses) included in earnings, assets 3 10
Unrealized gains/(losses) included in OCI, assets [1] 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 9 18
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 3 10
Change in unrealized gains/(losses) for the period included in OCI for Assets still held [1] 0 0
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 14 18
Total gains/(losses) included in earnings, assets 0 (3)
Unrealized gains/(losses) included in OCI, assets [1] 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 14 15
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 (3)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held [1] $ 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 [2]   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
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 [2]   $ 0
[1] Reported within the “Unrealized gains (losses) on available-for-sale securities” on MBIA’s Consolidated Statement of Comprehensive Income/Loss.
[2] Reported within the “Instrument-specific credit risk of liabilities measured at fair value” on MBIA’s Consolidated Statement of Comprehensive Income/Loss.