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Fair Value of Financial Instruments (Gains And Losses On Fair Value Option Included In The Company's Consolidated Statements Of Operations) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange $ 4 $ 45 $ 40
Non Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange 4 45 40
Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange (45) (14) (8)
Investments Carried At Fair Value [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [1] 1 (17) 3
Fixed Maturity Securities Held At Fair Value - VIE [Member] | Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [2] (4) (5) 4
Loans Receivable and Other Instruments at Fair Value [Member] | Variable Interest Entity [Member] | Residential Mortgage Loans [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [2] (33) 10 32
Loan Repurchase Commitments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [3] 0 0 (4)
Other Assets [Member] | Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [2] 4 9 0
Medium Term Notes [Member] | Non Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [1] (5) 24 17
Variable Interest Entity Notes [Member] | Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange [2] $ (25) $ (20) $ (50)
[1] Reported within "Net gains (losses) on financial instruments at fair value and foreign exchange" on MBIA's consolidated statements of operations.
[2] Reported within "Net gains (losses) on financial instruments at fair value and foreign exchange-VIE" and "Other net realized gains (losses)-VIE" on MBIA's consolidated statements of operations.
[3] Reported within "Net gains (losses) on financial instruments at fair value and foreign exchange-VIE" on MBIA's consolidated statements of operations.