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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, 2022
Mar. 31, 2021
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 104 $ 744
Total gains/(losses) included in earnings, assets 2 8
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 38 0
Issuances, assets 0 0
Settlements, assets (6) (605)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 138 147
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 11
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0
Beginning balance, fair value liabilities 389 462
Total (gains)/losses included in earnings, liabilities (4) 15
Unrealized (gains)/losses included in OCI, liabilities [2] 10 (14)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (11) (78)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 384 385
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (11) (3)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 13 5
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 77 120
Total gains/(losses) included in earnings, assets 1 9
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (2) (5)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 76 124
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 8
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
Total gains/(losses) included in earnings, assets   (4)
Unrealized gains/(losses) included in OCI, assets [1]   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
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 0  
Total gains/(losses) included in earnings, assets 0  
Unrealized gains/(losses) included in OCI, assets [1] 0  
Purchases, assets 38  
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 38  
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 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  
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 98 110
Total (gains)/losses included in earnings, liabilities (8) (7)
Unrealized (gains)/losses included in OCI, liabilities [2] 9 2
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 99 105
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (8) (7)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 9 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 [2]   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
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
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 291 303
Total (gains)/losses included in earnings, liabilities 4 22
Unrealized (gains)/losses included in OCI, liabilities [2] 1 (16)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (11) (29)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 285 280
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (3) 4
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 4 3
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 9 6
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 9 9
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 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 14
Total gains/(losses) included in earnings, assets 1 0
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 15 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 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.