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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 148 $ 150 $ 104 $ 744
Total gains/(losses) included in earnings, assets 4 0 1 31
Unrealized gains/(losses) included in OCI, assets (2) [1] 0 [1] (6) [1] 0
Purchases, assets 102 0 161 0
Issuances, assets 0 0 0 0
Settlements, assets (2) (2) (10) (613)
Sales, assets (17) (47) (17) (61)
Transfers into level 3, assets 0 4 0 4
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 233 105 233 105
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 2 (1) (5) 25
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held (3) [1] 0 [1] 0 [1] 0
Beginning balance, fair value liabilities 259 395 389 462
Total (gains)/losses included in earnings, liabilities 30 (7) (16) 31
Unrealized (gains)/losses included in OCI, liabilities (21) [2] 10 [2] 11 (10)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (52) (4) (168) (84)
Sales, liabilities 0 0 0 (5)
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 216 394 216 394
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (5) (9) (32) 10
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 5 10 [2] 22 9
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 68 129 77 120
Total gains/(losses) included in earnings, assets 13 (3) 8 31
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [1] 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (2) (2) (6) (13)
Sales, assets 0 (47) 0 (61)
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 79 77 79 77
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 11 (4) 2 21
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0 [1] 0 [1] 0 [1] 0
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       604
Total gains/(losses) included in earnings, assets       (4)
Unrealized gains/(losses) included in OCI, assets       0
Purchases, assets       0
Issuances, assets       0
Settlements, assets       (600)
Sales, assets       0
Transfers into level 3, assets       0
Transfers out of level 3, assets       0
Ending balance, fair value assets   0   0
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 Liabilities still held       0
Residential Mortgage-Backed Non-Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 55   0  
Total gains/(losses) included in earnings, assets 0   0  
Unrealized gains/(losses) included in OCI, assets [1] (2)   (6)  
Purchases, assets 1   60  
Issuances, assets 0   0  
Settlements, assets 0   0  
Sales, assets (17)   (17)  
Transfers into level 3, assets 0   0  
Transfers out of level 3, assets 0   0  
Ending balance, fair value assets 37   37  
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 [1] (3)   0  
Commercial Mortgage-Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   0   0
Total gains/(losses) included in earnings, assets   0   0
Unrealized gains/(losses) included in OCI, assets   0 [1]   0
Purchases, assets   0   0
Issuances, assets   0   0
Settlements, assets   0   0
Sales, assets   0   0
Transfers into level 3, assets   4   4
Transfers out of level 3, assets   0   0
Ending balance, fair value assets   4   4
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 [1]   0
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets     4  
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     (4)  
Sales, assets     0  
Transfers into level 3, assets     0  
Transfers out of level 3, assets     0  
Ending balance, fair value assets 0   0  
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 Liabilities still held [1]     0  
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 42 105 98 110
Total (gains)/losses included in earnings, liabilities (8) (4) (29) (13)
Unrealized (gains)/losses included in OCI, liabilities 4 [2] 1 [2] 17 5
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 (48) 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 38 102 38 102
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (8) (4) (28) (13)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 4 1 [2] 18 5
Other Derivatives Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities       49
Total (gains)/losses included in earnings, liabilities       0
Unrealized (gains)/losses included in OCI, liabilities       0
Purchases, liabilities       0
Issuances, liabilities       0
Settlements, liabilities       (49)
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
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 217 290 291 303
Total (gains)/losses included in earnings, liabilities 33 (3) 8 44
Unrealized (gains)/losses included in OCI, liabilities (25) [2] 9 [2] (6) (15)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (52) (4) (120) (35)
Sales, liabilities 0 0 0 (5)
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 173 292 173 292
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (2) (5) (9) 23
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 1 9 [2] 4 4
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 9 8 9 6
Total gains/(losses) included in earnings, assets (9) 1 (9) 3
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [1] 0 [1] 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 0 9 0 9
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (9) 1 (9) 3
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0 [1] 0 [1] 0 [1] 0
Beginning balance, fair value liabilities 0   0  
Total (gains)/losses included in earnings, liabilities 5   5  
Unrealized (gains)/losses included in OCI, liabilities 0 [2]   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 5   5  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 5   5  
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 0   0  
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 16 13 14 14
Total gains/(losses) included in earnings, assets 0 2 2 1
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [1] 0 [1] 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 16 15 16 15
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 2 2 1
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held 0 [1] $ 0 [1] 0 [1] $ 0
Equity investments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 0   0  
Total gains/(losses) included in earnings, assets 0   0  
Unrealized gains/(losses) included in OCI, assets [1] 0   0  
Purchases, assets 101   101  
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 101   101  
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 [1] $ 0   $ 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.