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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 208 $ 138 $ 216 $ 104
Total gains/(losses) included in earnings, assets (9) (4) 0 (2)
Unrealized gains/(losses) included in OCI, assets [1] 0 (5) 0 (5)
Purchases, assets 0 21 0 59
Issuances, assets 0 0 0 0
Settlements, assets (2) (2) (5) (8)
Sales, assets (9) 0 (24) 0
Transfers into level 3, assets 0 0 1 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 188 148 188 148
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (14) (7) (8) (7)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 (3) 0 0
Beginning balance, fair value liabilities 207 384 219 389
Total (gains)/losses included in earnings, liabilities 15 (43) 39 (48)
Unrealized (gains)/losses included in OCI, liabilities [2] (13) 21 (29) 33
Purchases, liabilities 0 0 0 0
Issuances, liabilities 62 0 62 0
Settlements, liabilities (22) (103) (24) (115)
Sales, liabilities (16) 0 (34) 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 233 259 233 259
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (7) (18) 3 (28)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 6 8 4 20
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 83 76 78 77
Total gains/(losses) included in earnings, assets (11) (6) (3) (5)
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) (5) (4)
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 70 68 70 68
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (12) (8) (7) (9)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0 0 0 0
Residential Mortgage-Backed Non-Agency [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   38   0
Total gains/(losses) included in earnings, assets   1   1
Unrealized gains/(losses) included in OCI, assets [1]   (5)   (5)
Purchases, assets   21   59
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   55   55
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]   (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 Liabilities still held [1] 0   0  
Equity investments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 115   115  
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   0  
Transfers out of level 3, assets 0   0  
Ending balance, fair value assets 115   115  
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  
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 Liabilities still held [1]       0
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 42 99 41 98
Total (gains)/losses included in earnings, liabilities (3) (13) 0 (22)
Unrealized (gains)/losses included in OCI, liabilities [2] (1) 3 (3) 13
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 (47) 0 (47)
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 38 42 38 42
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (3) (12) 0 (20)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] (1) 5 (3) 14
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 154 285 172 291
Total (gains)/losses included in earnings, liabilities 17 (30) 33 (26)
Unrealized (gains)/losses included in OCI, liabilities [2] (12) 18 (26) 20
Purchases, liabilities 0 0 0 0
Issuances, liabilities 62 0 62 0
Settlements, liabilities (22) (56) (24) (68)
Sales, liabilities (16) 0 (34) 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 183 217 183 217
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (5) (6) (3) (8)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 7 3 7 6
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   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   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   0
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1]   0   0
Beginning balance, fair value liabilities 11   6  
Total (gains)/losses included in earnings, liabilities 1   6  
Unrealized (gains)/losses included in OCI, liabilities [2] 0   0  
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 12   12  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1   6  
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] 0   0  
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 9 15 23 14
Total gains/(losses) included in earnings, assets 2 1 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 (9) 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 (2) 1 (1) 2
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [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.