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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 188 $ 148 $ 216 $ 104
Total gains/(losses) included in earnings, assets (7) 4 (7) 1
Unrealized gains/(losses) included in OCI, assets [1] 0 (2) 0 (6)
Purchases, assets 0 102 0 161
Issuances, assets 0 0 0 0
Settlements, assets (2) (2) (7) (10)
Sales, assets (29) (17) (53) (17)
Transfers into level 3, assets 0 0 1 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 150 233 150 233
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (8) 2 (4) (5)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1] 0 (3) 0 0
Beginning balance, fair value liabilities 233 259 219 389
Total (gains)/losses included in earnings, liabilities 11 30 51 (16)
Unrealized (gains)/losses included in OCI, liabilities [2] (12) (21) (41) 11
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 62 0
Settlements, liabilities (21) (52) (45) (168)
Sales, liabilities (85) 0 (120) 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 126 216 126 216
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (2) (5) 6 (32)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 2 5 (1) 22
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 70 68 78 77
Total gains/(losses) included in earnings, assets (7) 13 (10) 8
Unrealized gains/(losses) included in OCI, assets [1] 0 0 0 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (2) (2) (7) (6)
Sales, assets (29) 0 (29) 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 32 79 32 79
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (8) 11 (3) 2
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1] 0 0 0 0
Residential Mortgage-Backed Non Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   55   0
Total gains/(losses) included in earnings, assets   0   0
Unrealized gains/(losses) included in OCI, assets [1]   (2)   (6)
Purchases, assets   1   60
Issuances, assets   0   0
Settlements, assets   0   0
Sales, assets   (17)   (17)
Transfers into level 3, assets   0   0
Transfers out of level 3, assets   0   0
Ending balance, fair value assets   37   37
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 Assets still held, assets [1]   (3)   0
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1   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 0   0  
Sales, assets 0   0  
Transfers into level 3, assets 0   1  
Transfers out of level 3, assets 0   0  
Ending balance, fair value assets 1   1  
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 Assets still held, assets [1] 0   0  
Equity investments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 115 0 115 0
Total gains/(losses) included in earnings, assets 0 0 0 0
Unrealized gains/(losses) included in OCI, assets [1] 0 0 0 0
Purchases, assets 0 101 0 101
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 115 101 115 101
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1] 0 0 0 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   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
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 38 42 41 98
Total (gains)/losses included in earnings, liabilities (3) (8) (2) (29)
Unrealized (gains)/losses included in OCI, liabilities [2] 2 4 (2) 17
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 (48)
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 37 38 37 38
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (3) (8) (2) (28)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 2 4 (2) 18
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 183 217 172 291
Total (gains)/losses included in earnings, liabilities 15 33 48 8
Unrealized (gains)/losses included in OCI, liabilities [2] (14) (25) (39) (6)
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 62 0
Settlements, liabilities (21) (52) (45) (120)
Sales, liabilities (85) 0 (120) 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 78 173 78 173
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 2 (2) 3 (9)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 0 1 1 4
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   9   9
Total gains/(losses) included in earnings, assets   (9)   (9)
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   0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (9)   (9)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1]   0   0
Beginning balance, fair value liabilities 12 0 6 0
Total (gains)/losses included in earnings, liabilities (1) 5 5 5
Unrealized (gains)/losses included in OCI, liabilities [2] 0 0 0 0
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 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 11 5 11 5
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (1) 5 5 5
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 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 2 16 23 14
Total gains/(losses) included in earnings, assets 0 0 3 2
Unrealized gains/(losses) included in OCI, assets [1] 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 (24) 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 2 16 2 16
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 1 2
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [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.