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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Collateralized Debt Obligations [Member]
    
Investment Holdings [Line Items]    
VIE Assets $ 25,175 $ 26,507
Maximum Exposure to Loss 13,686 15,466
Investments 39 [1] 42 [1]
Premiums Receivable 60 [2] 67 [2]
Unearned Premium Revenue 52 [3] 58 [3]
Loss and Loss Adjustment Expense Reserves 3 [4] 3 [4]
Derivative Liabilities 175 [5] 113 [5]
Residential Mortgage-Backed Securities [Member]
    
Investment Holdings [Line Items]    
VIE Assets 45,442 47,669
Maximum Exposure to Loss 15,851 16,379
Investments 11 [1] 25 [1]
Premiums Receivable 84 [2] 87 [2]
Insurance Loss Recoverable 2,854 [6] 2,773 [6]
Unearned Premium Revenue 82 [3] 86 [3]
Loss and Loss Adjustment Expense Reserves 442 [4] 428 [4]
Derivative Liabilities 6 [5] 5 [5]
Commercial Mortgage-Backed [Member]
    
Investment Holdings [Line Items]    
VIE Assets 5,046 5,001
Maximum Exposure to Loss 2,655 2,644
Premiums Receivable 2 [2] 2 [2]
Unearned Premium Revenue 2 [3] 2 [3]
Consumer Asset-Backed [Member]
    
Investment Holdings [Line Items]    
VIE Assets 7,326 8,015
Maximum Exposure to Loss 4,056 4,563
Investments 12 [1] 16 [1]
Premiums Receivable 23 [2] 26 [2]
Unearned Premium Revenue 22 [3] 25 [3]
Loss and Loss Adjustment Expense Reserves 20 [4] 23 [4]
Corporate Asset-Backed [Member]
    
Investment Holdings [Line Items]    
VIE Assets 27,455 29,855
Maximum Exposure to Loss 13,309 15,577
Investments 87 [1] 241 [1]
Premiums Receivable 170 [2] 192 [2]
Insurance Loss Recoverable 20 [6] 22 [6]
Unearned Premium Revenue 185 [3] 205 [3]
Derivative Liabilities   1 [5]
Total Global Structured Finance [Member]
    
Investment Holdings [Line Items]    
VIE Assets 110,444 117,047
Maximum Exposure to Loss 49,557 54,629
Investments 149 [1] 324 [1]
Premiums Receivable 339 [2] 374 [2]
Insurance Loss Recoverable 2,874 [6] 2,795 [6]
Unearned Premium Revenue 343 [3] 376 [3]
Loss and Loss Adjustment Expense Reserves 465 [4] 454 [4]
Derivative Liabilities 181 [5] 119 [5]
Global Public Finance [Member]
    
Investment Holdings [Line Items]    
VIE Assets 42,975 42,106
Maximum Exposure to Loss 22,042 21,774
Premiums Receivable 215 [2] 215 [2]
Unearned Premium Revenue 270 [3] 270 [3]
Total Insurance [Member]
    
Investment Holdings [Line Items]    
VIE Assets 153,419 159,153
Maximum Exposure to Loss 71,599 76,403
Investments 149 [1] 324 [1]
Premiums Receivable 554 [2] 589 [2]
Insurance Loss Recoverable 2,874 [6] 2,795 [6]
Unearned Premium Revenue 613 [3] 646 [3]
Loss and Loss Adjustment Expense Reserves 465 [4] 454 [4]
Derivative Liabilities $ 181 [5] $ 119 [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 "Unearned premium revenue" on MBIA's consolidated balance sheets.
[4] Reported within "Loss and loss adjustment expense reserves" on MBIA's consolidated balance sheets
[5] Reported within "Derivative liabilities" on MBIA's consolidated balance sheets.
[6] Reported within "Insurance loss recoverable" on MBIA's consolidated balance sheets