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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Collateralized Debt Obligations [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets $ 9,204 $ 12,565
Maximum Exposure to Loss 6,042 7,693
Investments 114 [1] 120 [1]
Premiums receivable 29 [2] 43 [2]
Insurance loss recoverable   0 [3]
Unearned premium revenue 24 [4] 37 [4]
Loss and loss adjustment expense reserves   21
Derivative liabilities 96 [5] 108 [5]
Residential Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 14,870 21,738
Maximum Exposure to Loss 7,906 9,251
Investments 10 [1] 10 [1]
Premiums receivable 44 [2] 53 [2]
Insurance loss recoverable 548 [3] 658 [3]
Unearned premium revenue 43 [4] 51 [4]
Loss and loss adjustment expense reserves 319 [6] 327
Derivative liabilities   5 [5]
Commercial Mortgage Backed Securities [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 590 1,367
Maximum Exposure to Loss 294 447
Investments   0 [1]
Premiums receivable 1 [2] 1 [2]
Insurance loss recoverable   0 [3]
Unearned premium revenue 1 [4] 1 [4]
Loss and loss adjustment expense reserves   0
Derivative liabilities   0 [5]
Consumer Asset Backed [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 6,167 7,830
Maximum Exposure to Loss 2,063 2,740
Investments 0 [1] 9 [1]
Premiums receivable 17 [2] 19 [2]
Insurance loss recoverable   0 [3]
Unearned premium revenue 15 [4] 19 [4]
Loss and loss adjustment expense reserves 9 [6] 13
Derivative liabilities   0 [5]
Corporate Asset Backed [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 9,572 13,028
Maximum Exposure to Loss 5,764 7,248
Investments 1 [1] 2 [1]
Premiums receivable 57 [2] 80 [2]
Insurance loss recoverable 11 [3] 18 [3]
Unearned premium revenue 67 [4] 96 [4]
Loss and loss adjustment expense reserves   0
Derivative liabilities   0 [5]
Global Structured Finance [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 40,403 56,528
Maximum Exposure to Loss 22,069 27,379
Investments 125 [1] 141 [1]
Premiums receivable 148 [2] 196 [2]
Insurance loss recoverable 559 [3] 676 [3]
Unearned premium revenue 150 [4] 204 [4]
Loss and loss adjustment expense reserves 328 [6] 361
Derivative liabilities 96 [5] 113 [5]
Global Public Finance [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 52,379 52,317
Maximum Exposure to Loss 19,320 20,162
Investments 0 [1] 0 [1]
Premiums receivable 191 [2] 206 [2]
Insurance loss recoverable   0 [3]
Unearned premium revenue 229 [4] 248 [4]
Loss and loss adjustment expense reserves 5 [6] 5
Derivative liabilities   0 [5]
Total Insurance [Member]
    
Variable Interest Entity [Line Items]    
VIE Assets 92,782 108,845
Maximum Exposure to Loss 41,389 47,541
Investments 125 [1] 141 [1]
Premiums receivable 339 [2] 402 [2]
Insurance loss recoverable 559 [3] 676 [3]
Unearned premium revenue 379 [4] 452 [4]
Loss and loss adjustment expense reserves 333 [6] 366
Derivative liabilities $ 96 [5] $ 113 [5]
[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 Derivative liabilities on MBIA's consolidated balance sheets.
[6]
Reported within Loss and loss adjustment expense reserves on MBIA's consolidated balance sheets.