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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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 744 $ 649
Total gains/(losses) included in earnings, assets 31 112
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (619) (17)
Sales, assets (60) 0
Transfers into level 3, assets 8 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 104 744
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 24 108
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0
Beginning balance, fair value liabilities 462 500
Total (gains)/losses included in earnings, liabilities 29 35
Unrealized (gains)/losses included in OCI, liabilities [2] (5) (53)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (92) (20)
Sales, liabilities (5) 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 389 462
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 7 35
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 15 (51)
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 32 0
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (15) (16)
Sales, assets (60) 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 77 120
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 21 (4)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities 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) 118
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 0 604
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 118
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0
Commercial Mortgage-Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0  
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 4  
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  
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0  
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 4  
Transfers out of level 3, assets 0  
Ending balance, fair value assets 4 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  
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 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   (1)
Sales, assets   0
Transfers into level 3, assets   0
Transfers out of level 3, assets   0
Ending balance, fair value assets   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 110 108
Total (gains)/losses included in earnings, liabilities (17) 15
Unrealized (gains)/losses included in OCI, liabilities [2] 10 (13)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (5) 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 98 110
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (17) 15
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 10 (13)
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 0 7
Total (gains)/losses included in earnings, liabilities   (6)
Unrealized (gains)/losses included in OCI, liabilities [2]   0
Purchases, liabilities   0
Issuances, liabilities   0
Settlements, liabilities   (1)
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
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 15
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 49
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 15
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 46 11
Unrealized (gains)/losses included in OCI, liabilities [2] (15) (40)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (38) (15)
Sales, liabilities (5) 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 291 303
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 24 5
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 5 (38)
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 (2)
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 6
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 3 (2)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities 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 (4)
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 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 (4)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0
Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities $ 0 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.