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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange $ 40 $ (86) $ (78)
Non Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange 40 (86) (78)
Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange (8) 108 105
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] 3 2 15
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 4 95
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] 32 0 35
Loan Repurchase Commitments [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) 118 68
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] 0 (4) 4
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] 17 (15) 1
Other Liabilities [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 [3] 0 0 (2)
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] $ (50) $ (12) $ (89)
[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” on MBIA’s consolidated statements of operations.
[3] Reported within “Other net realized gains (losses)” on MBIA’s consolidated statements of operations.