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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]    
Insurance loss recoverable $ 483 $ 533
Global Structured Finance [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 31,615 35,940
Maximum Exposure to Loss 17,120 19,958
Investments [1] 109 119
Premiums receivable [2] 100 123
Insurance loss recoverable 477 524 [3]
Unearned premium revenue [4] 100 121
Loss and loss adjustment expense reserves [5] 401 389
Derivative liabilities [6] 23 102
Global Structured Finance [Member] | Collateralized Debt Obligations [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 7,025 8,613
Maximum Exposure to Loss 4,216 5,623
Investments [1] 91 110
Premiums receivable [2] 16 24
Unearned premium revenue [4] 13 20
Loss and loss adjustment expense reserves [5] 107 70
Derivative liabilities [6] 23 102
Global Structured Finance [Member] | Residential Mortgage Backed Securities [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 12,790 14,136
Maximum Exposure to Loss 6,834 7,459
Investments [1] 18 9
Premiums receivable [2] 36 41
Insurance loss recoverable [3] 471 518
Unearned premium revenue [4] 35 39
Loss and loss adjustment expense reserves [5] 285 307
Global Structured Finance [Member] | Commercial Mortgage Backed Securities [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 338 571
Maximum Exposure to Loss 246 279
Premiums receivable [2] 1 1
Unearned premium revenue [4] 1 1
Global Structured Finance [Member] | Consumer Asset Backed [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 5,701 6,008
Maximum Exposure to Loss 1,852 1,989
Premiums receivable [2] 14 16
Unearned premium revenue [4] 13 14
Loss and loss adjustment expense reserves [5] 9 12
Global Structured Finance [Member] | Corporate Asset Backed [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 5,761 6,612
Maximum Exposure to Loss 3,972 4,608
Premiums receivable [2] 33 41
Insurance loss recoverable [3] 6 6
Unearned premium revenue [4] 38 47
Global Public Finance [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 45,296 49,686
Maximum Exposure to Loss 16,210 16,698
Premiums receivable [2] 171 179
Unearned premium revenue [4] 204 211
Total Insurance [Member]    
Variable Interest Entity [Line Items]    
VIE Assets 76,911 85,626
Maximum Exposure to Loss 33,330 36,656
Investments [1] 109 119
Premiums receivable [2] 271 302
Insurance loss recoverable [3] 477 524
Unearned premium revenue [4] 304 332
Loss and loss adjustment expense reserves [5] 401 389
Derivative liabilities [6] $ 23 $ 102
[1] Reported within Investments on MBIA's consolidated balance sheets.
[2] Reported within Premiums receivable on MBIA's consolidated balance sheets.
[3] Reported within Insurance loss recoverable on MBIA's consolidated balance sheets.
[4] Reported within Unearned premium revenue on MBIA's consolidated balance sheets.
[5] Reported within Loss and loss adjustment expense reserves on MBIA's consolidated balance sheets.
[6] Reported within Derivative liabilities on MBIA's consolidated balance sheets.