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Variable Interest Entities (Summary Of Maximum Exposure To Loss For Nonconsolidated VIEs) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Collateralized Debt Obligations [Member]
    
VIE Assets $ 29,140 $ 30,628
Maximum Exposure to Loss 17,197 18,068
Investments 137 [1] 126 [2]
Premiums Receivable 68 [2] 78 [2]
Unearned Premium Revenue 59 [3] 68 [3]
Derivative Liabilities 428 [4] 360 [4]
Residential Mortgage-Backed Agency [Member]
    
VIE Assets 51,751 56,828
Maximum Exposure to Loss 17,206 18,494
Investments 77 [1] 71 [2]
Premiums Receivable 90 [2] 95 [2]
Insurance Loss Recoverable 2,361 [5] 2,270 [5]
Unearned Premium Revenue 88 [3] 93 [3]
Loss and Loss Adjustment Expense Reserves 354 [6] 598 [6]
Derivative Liabilities 6 [4] 3 [4]
Commercial Mortgage-Backed [Member]
    
VIE Assets 5,684 5,547
Maximum Exposure to Loss 3,160 3,138
Premiums Receivable 2 [2] 2 [2]
Unearned Premium Revenue 2 [3] 2 [3]
Consumer Asset-Backed [Member]
    
VIE Assets 9,123 11,709
Maximum Exposure to Loss 5,393 6,780
Investments 18 [1] 19 [2]
Premiums Receivable 27 [2] 30 [2]
Unearned Premium Revenue 27 [3] 29 [3]
Loss and Loss Adjustment Expense Reserves 18 [6]  
Corporate Asset-Backed [Member]
    
VIE Assets 30,011 42,380
Maximum Exposure to Loss 17,060 22,468
Investments 269 [1] 246 [2]
Premiums Receivable 205 [2] 325 [2]
Insurance Loss Recoverable 12 [5] 5 [5]
Unearned Premium Revenue 219 [3] 340 [3]
Global Structured Finance [Member]
    
VIE Assets 125,709 147,092
Maximum Exposure to Loss 60,016 68,948
Investments 501 [1] 462 [2]
Premiums Receivable 392 [2] 530 [2]
Insurance Loss Recoverable 2,373 [5] 2,275 [5]
Unearned Premium Revenue 395 [3] 532 [3]
Loss and Loss Adjustment Expense Reserves 372 [6] 598 [6]
Derivative Liabilities 434 [4] 363 [4]
Global Public Finance [Member]
    
VIE Assets 43,781 42,370
Maximum Exposure to Loss 23,485 21,201
Premiums Receivable 222 [2] 225 [2]
Unearned Premium Revenue 277 [3] 280 [3]
Total Insurance [Member]
    
VIE Assets 169,490 189,462
Maximum Exposure to Loss 83,501 90,149
Investments 501 [1] 462 [2]
Premiums Receivable 614 [2] 755 [2]
Insurance Loss Recoverable 2,373 [5] 2,275 [5]
Unearned Premium Revenue 672 [3] 812 [3]
Loss and Loss Adjustment Expense Reserves 372 [6] 598 [6]
Derivative Liabilities $ 434 [4] $ 363 [4]
[1] Reported within "Investments" on MBIA's consolidated balance sheets.
[2]
[3] Reported within "Unearned premium revenue" on MBIA's consolidated balance sheets.
[4] Reported within "Derivative liabilities" on MBIA's consolidated balance sheets.
[5] Reported within "Insurance loss recoverable" on MBIA's consolidated balance sheets.
[6] Reported within "Loss and loss adjustment expense reserves" on MBIA's consolidated balance sheets.