XML 58 R47.htm IDEA: XBRL DOCUMENT v3.21.1
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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange $ 51 $ (63)
Non Variable Interest Entity [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange 51 (63)
Variable Interest Entity [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange (14) 15
Investments Carried At Fair Value [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] 3 (20)
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] 1 (6)
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] 9 (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) 20
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 (3)
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] 7 (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] $ (23) $ 27
[1] Reported within “Net gains (losses) of financial instruments at fair value and foreign exchange” on MBIA’s consolidated statements of operations.
[2] Reported within “Net gains (losses) of financial instruments at fair value and foreign exchange-VIE” on MBIA’s consolidated statements of operations.