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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 138 $ 147 $ 104 $ 744
Total gains/(losses) included in earnings, assets (4) 22 (2) 31
Unrealized gains/(losses) included in OCI, assets (5) 0 (5) 0
Purchases, assets 21 0 59 0
Issuances, assets 0 0 0 0
Settlements, assets (2) (5) (8) (611)
Sales, assets 0 (14) 0 (14)
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 148 150 148 150
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (7) 22 (7) 32
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] (3) 0 0 0
Beginning balance, fair value liabilities 384 385 389 462
Total (gains)/losses included in earnings, liabilities (43) 24 (48) 39
Unrealized (gains)/losses included in OCI, liabilities 21 (6) 33 (20)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (103) (3) (115) (81)
Sales, liabilities 0 (5) 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 259 395 259 395
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (18) 22 (28) 19
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 8 (5) [1],[2] 20 [1],[2] (1) [1],[2]
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 76 124 77 120
Total gains/(losses) included in earnings, assets (6) 24 (5) 34
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 (2) (5) (4) (11)
Sales, assets 0 (14) 0 (14)
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 68 129 68 129
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (8) 24 (9) 31
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 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       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 [1]       0
Residential Mortgage-Backed Non-Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 38   0  
Total gains/(losses) included in earnings, assets 1   1  
Unrealized gains/(losses) included in OCI, assets (5)   (5)  
Purchases, assets 21   59  
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 55   55  
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  
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     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 99 105 98 110
Total (gains)/losses included in earnings, liabilities (13) (2) (22) (9)
Unrealized (gains)/losses included in OCI, liabilities 3 2 13 4
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (47) 0 (47) 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 42 105 42 105
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (12) (2) (20) (9)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 5 2 [1],[2] 14 [1],[2] 4 [1],[2]
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 [1],[2]       0
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 285 280 291 303
Total (gains)/losses included in earnings, liabilities (30) 26 (26) 48
Unrealized (gains)/losses included in OCI, liabilities 18 (8) 20 (24)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (56) (3) (68) (32)
Sales, liabilities 0 (5) 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 217 290 217 290
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (6) 24 (8) 28
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 3 (7) [1],[2] 6 [1],[2] (5) [1],[2]
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 9 9 9 6
Total gains/(losses) included in earnings, assets 0 (1) 0 2
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 9 8 9 8
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 (1) 0 2
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 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 15 14 14 14
Total gains/(losses) included in earnings, assets 1 (1) 2 (1)
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 16 13 16 13
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 (1) 2 (1)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] $ 0 $ 0 $ 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.