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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, 2023
Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 216 $ 104
Total gains/(losses) included in earnings, assets (36) 26
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2]
Purchases, assets 0 160
Issuances, assets 0 0
Settlements, assets (9) (24)
Sales, assets (26) (50)
Transfers into level 3, assets 1 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 146 216
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (7) 5
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2]
Beginning balance, fair value liabilities 219 389
Total (gains)/losses included in earnings, liabilities 38 (4)
Unrealized (gains)/losses included in OCI, liabilities (44) [3] 14 [4]
Purchases, liabilities 0 0
Issuances, liabilities 62 0
Settlements, liabilities (46) (180)
Sales, liabilities (97) 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 132 219
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 15 (27)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held $ (4) [3] $ 31 [4]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Income Other Income
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Income Other Income
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax  
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 78 $ 77
Total gains/(losses) included in earnings, assets (33) 10
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2]
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (9) (9)
Sales, assets (1) 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 35 78
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 5
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2]
Residential Mortgage-Backed Non Agency [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 0
Total gains/(losses) included in earnings, assets   2
Unrealized gains/(losses) included in OCI, assets [2]   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
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 Assets still held, assets [2]   0
Corporate Obligations [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 1  
Transfers out of level 3, assets 0  
Ending balance, fair value assets 1 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 Assets still held, assets [1] 0  
Equity investments [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 115 0
Total gains/(losses) included in earnings, assets (7) 14
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2]
Purchases, assets 0 101
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 108 115
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (7) 0
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2]
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 4
Total gains/(losses) included in earnings, assets   0
Unrealized gains/(losses) included in OCI, assets [2]   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 Assets still held, assets [2]   0
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 41 98
Total (gains)/losses included in earnings, liabilities 5 (24)
Unrealized (gains)/losses included in OCI, liabilities (6) [3] 16 [4]
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 0 (49)
Sales, liabilities 0 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 40 41
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 5 (23)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held (6) [3] $ 17 [4]
Variable Interest Entity Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]   Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 172 $ 291
Total (gains)/losses included in earnings, liabilities 25 14
Unrealized (gains)/losses included in OCI, liabilities (38) [3] (2) [4]
Purchases, liabilities 0 0
Issuances, liabilities 62 0
Settlements, liabilities (46) (131)
Sales, liabilities (97) 0
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 78 172
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 (10)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 2 [3] 14 [4]
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 0 9
Total gains/(losses) included in earnings, assets   (9)
Unrealized gains/(losses) included in OCI, assets [2]   0
Purchases, assets   0
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   0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (9)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [2]   0
Beginning balance, fair value liabilities 6 0
Total (gains)/losses included in earnings, liabilities 8 6
Unrealized (gains)/losses included in OCI, liabilities 0 [3] 0 [4]
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 14 6
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 8 6
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 0 [3] 0 [4]
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 23 14
Total gains/(losses) included in earnings, assets 4 9
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2]
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets 0 0
Sales, assets (25) 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 2 23
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 9
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets $ 0 [1] $ 0 [2]
[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 "Unrealized gains (losses) on available-for-sale securities" on MBIA's Consolidated Statement of Comprehensive Income/Loss.
[3] Reported within the "Instrument-specific credit risk of liabilities measured at fair value" on MBIA's Consolidated Statement of Comprehensive Income/Loss.
[4] Reported within the "Instrument-specific credit risk of liabilities measured at fair value" on MBIA's Consolidated Statement of Comprehensive Income/Loss.