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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) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Net Gains Losses On Financial Instruments At Fair Value And Foreign Exchange
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Net Gains Losses On Financial Instruments At Fair Value And Foreign Exchange
Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 104 $ 744
Total gains/(losses) included in earnings, assets 26 31
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 160 0
Issuances, assets 0 0
Settlements, assets (24) (619)
Sales, assets (50) (60)
Transfers into level 3, assets 0 8
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 216 104
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 5 24
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) 29
Unrealized (gains)/losses included in OCI, liabilities [2] 14 (5)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (180) (92)
Sales, liabilities 0 (5)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 219 389
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (27) 7
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 31 15
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 77 120
Total gains/(losses) included in earnings, assets 10 32
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (9) (15)
Sales, assets 0 (60)
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 78 77
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 5 21
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] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 604
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] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0  
Total gains/(losses) included in earnings, assets 2  
Unrealized gains/(losses) included in OCI, assets [1] 0  
Purchases, assets 59  
Issuances, assets 0  
Settlements, assets (11)  
Sales, assets (50)  
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  
Commercial Mortgage-Backed [Member] | Variable Interest Entity Primary Beneficiary [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 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
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] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 4 0
Total gains/(losses) included in earnings, assets 0 0
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (4) 0
Sales, assets 0 0
Transfers into level 3, assets 0 4
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 0 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 [1] 0 0
Medium Term Notes [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 98 110
Total (gains)/losses included in earnings, liabilities (24) (17)
Unrealized (gains)/losses included in OCI, liabilities [2] 16 10
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (49) (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 41 98
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (23) (17)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 17 10
Other Derivatives Liabilities [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 0 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] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 291 303
Total (gains)/losses included in earnings, liabilities 14 46
Unrealized (gains)/losses included in OCI, liabilities [2] (2) (15)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (131) (38)
Sales, liabilities 0 (5)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 172 291
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (10) 24
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 14 5
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 9 6
Total gains/(losses) included in earnings, assets (9) 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 0 9
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (9) 3
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0
Beginning balance, fair value liabilities 0  
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 0  
Sales, liabilities 0  
Transfers into Level 3, liabilities 0  
Transfers out of Level 3, liabilities 0  
Ending balance, fair value liabilities 6 0
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 6  
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 0  
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 14 14
Total gains/(losses) included in earnings, assets 9 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 23 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 9 0
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0
Equity investments [Member] | Fair Value Inputs Level 3 [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0  
Total gains/(losses) included in earnings, assets 14  
Unrealized gains/(losses) included in OCI, assets [1] 0  
Purchases, assets 101  
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 115 $ 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  
[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.