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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 669 $ 613 $ 649 $ 637
Total gains/(losses) included in earnings, assets 5 46 32 93
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (5) (6) (12) (25)
Sales, assets 0 0 0 (49)
Transfers into level 3, assets 0 0 [2] 0 0 [2]
Transfers out of level 3, assets 0 (3) [2] 0 (6) [2]
Ending balance, fair value assets 669 650 669 650
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 4 45 30 89
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0   0  
Beginning balance, fair value liabilities 432 489 500 513
Total (gains)/losses included in earnings, liabilities 19 20 15 72
Unrealized (gains)/losses included in OCI, liabilities (6) [3] 5 (56) [3] 4
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 3 0 7
Settlements, liabilities (4) (19) (18) (38)
Sales, liabilities 0 0 0 (60)
Transfers into Level 3, liabilities 0 0 [2] 0 0 [2]
Transfers out of Level 3, liabilities 0 0 [2] 0 0 [2]
Ending balance, fair value liabilities 441 498 441 498
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 17 (4) 9 35
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [3] (5)   (54)  
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 116 154 136 172
Total gains/(losses) included in earnings, assets 2 (3) (11) 40
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (4) (5) (11) (18)
Sales, assets 0 0 0 (48)
Transfers into level 3, assets 0 0 [2] 0 0 [2]
Transfers out of level 3, assets 0 0 [2] 0 0 [2]
Ending balance, fair value assets 114 146 114 146
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 (3) (13) 35
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0   0  
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 524 428 486 418
Total gains/(losses) included in earnings, assets 6 50 44 60
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 [2] 0 0 [2]
Transfers out of level 3, assets 0 0 [2] 0 0 [2]
Ending balance, fair value assets 530 478 530 478
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 6 50 44 60
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0   0  
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       5
Total gains/(losses) included in earnings, assets       0
Unrealized gains/(losses) included in OCI, assets       0
Purchases, assets       0
Issuances, assets       0
Settlements, assets       (2)
Sales, assets       0
Transfers into level 3, assets [2]       0
Transfers out of level 3, assets [2]       (3)
Ending balance, fair value assets   0   0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       0
Commercial Mortgage Backed Securities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets   4   7
Total gains/(losses) included in earnings, assets   0   0
Unrealized gains/(losses) included in OCI, assets   0   0
Purchases, assets   0   0
Issuances, assets   0   0
Settlements, assets   (1)   (4)
Sales, assets   0   0
Transfers into level 3, assets [2]   0   0
Transfers out of level 3, assets [2]   (3)   (3)
Ending balance, fair value assets   0   0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   0   0
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       1
Total gains/(losses) included in earnings, assets       0
Unrealized gains/(losses) included in OCI, assets       0
Purchases, assets       0
Issuances, assets       0
Settlements, assets       0
Sales, assets       (1)
Transfers into level 3, assets [2]       0
Transfers out of level 3, assets [2]       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
Other Asset Backed [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 1 1 1 3
Total gains/(losses) included in earnings, assets 0 0 0 (1)
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets (1) 0 (1) (1)
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 [2] 0 0 [2]
Transfers out of level 3, assets 0 0 [2] 0 0 [2]
Ending balance, fair value assets 0 1 0 1
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 0 0 0
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0   0  
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 96 110 108 102
Total (gains)/losses included in earnings, liabilities 8 1 8 6
Unrealized (gains)/losses included in OCI, liabilities (3) [3] (5) (15) [3] 1
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 (3)
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 [2] 0 0 [2]
Transfers out of Level 3, liabilities 0 0 [2] 0 0 [2]
Ending balance, fair value liabilities 101 106 101 106
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 8 1 8 1
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [3] (3)   (15)  
Credit Derivatives [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 8 18 7 33
Total (gains)/losses included in earnings, liabilities 0 1 1 (12)
Unrealized (gains)/losses included in OCI, liabilities 0 [3] 0 0 [3] 0
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 (9) 0 (11)
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 [2] 0 0 [2]
Transfers out of Level 3, liabilities 0 0 [2] 0 0 [2]
Ending balance, fair value liabilities 8 10 8 10
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 (9) 1 (23)
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [3] 0   0  
Other Derivatives Liabilities [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 37 16 34 7
Total (gains)/losses included in earnings, liabilities 1 14 4 23
Unrealized (gains)/losses included in OCI, liabilities 0 [3] 0 0 [3] 0
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 [2] 0 0 [2]
Transfers out of Level 3, liabilities 0 0 [2] 0 0 [2]
Ending balance, fair value liabilities 38 30 38 30
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 14 4 23
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [3] 0   0  
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 291 342 347 366
Total (gains)/losses included in earnings, liabilities 10 3 2 53
Unrealized (gains)/losses included in OCI, liabilities (3) [3] 10 (41) [3] 3
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 3 0 7
Settlements, liabilities (4) (10) (14) (21)
Sales, liabilities 0 0 0 (60)
Transfers into Level 3, liabilities 0 0 [2] 0 0 [2]
Transfers out of Level 3, liabilities 0 0 [2] 0 0 [2]
Ending balance, fair value liabilities 294 348 294 348
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 8 (11) (4) 32
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [3] (2)   (39)  
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14 11 8 17
Total gains/(losses) included in earnings, assets (2) (3) 4 (9)
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 [2] 0 0 [2]
Transfers out of level 3, assets 0 0 [2] 0 0 [2]
Ending balance, fair value assets 12 8 12 8
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (2) (4) 4 (9)
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0   0  
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 14 15 18 14
Total gains/(losses) included in earnings, assets (1) 2 (5) 3
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 0 [1] 0
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0 0 0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 [2] 0 0 [2]
Transfers out of level 3, assets 0 0 [2] 0 0 [2]
Ending balance, fair value assets 13 17 13 17
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (1) 2 (5) 3
Change in unrealized gains/(losses) for the period included in OCI for Liabilities still held [1] 0   0  
Other Payable [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities   3 4 5
Total (gains)/losses included in earnings, liabilities   1 0 2
Unrealized (gains)/losses included in OCI, liabilities   0 0 [3] 0
Purchases, liabilities   0 0 0
Issuances, liabilities   0 0 0
Settlements, liabilities   0 (4) (3)
Sales, liabilities   0 0 0
Transfers into Level 3, liabilities   0 [2] 0  
Transfers out of Level 3, liabilities   0 [2] 0 0 [2]
Ending balance, fair value liabilities $ 0 4 0 4
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities   $ 1 0 $ 2
Change in Unrealized (Gains)/ Losses for the Period Included in OCI for Liabilities still held [3]     $ 0  
[1] Reported within the “Unrealized gains (losses) on available-for-sale securities” on MBIA’s Consolidated Statement of Comprehensive Income/Loss.
[2] Transferred in and out at the end of the period.
[3] Reported within the “Instrument-specific credit risk of liabilities measured at fair value” on MBIA’s Consolidated Statement of Comprehensive Income/Loss.