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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, 2024
Mar. 31, 2023
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 146 $ 216
Total gains/(losses) included in earnings, assets (4) 9
Unrealized gains/(losses) included in OCI, assets [1] 0 (0)
Purchases, assets 6 0
Issuances, assets 0 0
Settlements, assets (1) (2)
Sales, assets 0 (16)
Transfers into level 3, assets 0 1
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 147 208
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (4) 6
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1] 0 (0)
Beginning balance, fair value liabilities 132 219
Total (gains)/losses included in earnings, liabilities 24 23
Unrealized (gains)/losses included in OCI, liabilities [2] (22) (16)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (37) (1)
Sales, liabilities 0 (18)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 97 207
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (1) 9
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] (3) (2)
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 35 78
Total gains/(losses) included in earnings, assets 2 7
Unrealized gains/(losses) included in OCI, assets [1] 0 0
Purchases, assets 0 0
Issuances, assets 0 0
Settlements, assets (1) (2)
Sales, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 36 83
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (2) 5
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1] 0 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 6 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 7 [3] 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 108 115
Total gains/(losses) included in earnings, assets (6) 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 102 115
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (6) 0
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [1] 0 0
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 40 41
Total (gains)/losses included in earnings, liabilities (2) 3
Unrealized (gains)/losses included in OCI, liabilities [2] (2) (2)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities 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 36 42
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (2) 3
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] (2) (2)
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 78 172
Total (gains)/losses included in earnings, liabilities 25 15
Unrealized (gains)/losses included in OCI, liabilities [2] (20) (14)
Purchases, liabilities 0 0
Issuances, liabilities 0 0
Settlements, liabilities (37) (1)
Sales, liabilities 0 (18)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 46 154
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 1
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held [2] (1) 0
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 14 6
Total (gains)/losses included in earnings, liabilities 1 5
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 15 11
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 5
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 2 23
Total gains/(losses) included in earnings, assets 0 2
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 (16)
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Ending balance, fair value assets 2 9
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 1
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [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.
[3] Includes loans carried at fair value of $6 million.