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Consolidated Statements Of Operations (USD $)
In Millions, except Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Change in fair value of insured derivatives:        
Realized gains (losses) and other settlements on insured derivatives $ (191) $ (64) $ (546) $ (98)
Unrealized gain (loss) on insured derivatives 116 1,538 (1,307) (674)
Net gains (losses) on financial instruments at fair value and foreign exchange (103) (2) (127) (48)
Investment losses related to other-than-temporary impairments:        
Net investment losses related to other-than-temporary impairments (20) (13) (33) (43)
Net gains (losses) on extinguishment of debt   18 26 18
Other net realized gains (losses)   19 5 19
Total revenues 98 2,077 (1,510) 221
Expenses:        
Losses and loss adjustment 50 (73) 14 142
Interest 75 81 150 165
Total expenses 245 109 400 512
Income (loss) before income taxes (147) 1,968 (1,910) (291)
Provision (benefit) for income taxes (284) 673 (772) (106)
Net income (loss) 137 1,295 (1,138) (185)
Net income (loss) per common share:        
Basic $ 0.69 $ 6.34 $ (5.70) $ (0.90)
Diluted $ 0.68 $ 6.32 $ (5.70) $ (0.90)
Weighted average number of common shares outstanding:        
Basic 199,295,797 204,377,833 199,602,865 204,639,226
Diluted 200,064,679 204,921,673 199,602,865 204,639,226
Non Variable Interest Entities [Member]
        
Premiums earned:        
Scheduled premiums earned 116 131 243 263
Refunding premiums earned 33 25 43 50
Premiums earned (net of ceded premiums of $3, $11, $6 and $20) 149 156 286 313
Net investment income 95 107 209 229
Fees and reimbursements 11 11 25 133
Change in fair value of insured derivatives:        
Realized gains (losses) and other settlements on insured derivatives (191) (64) (546) (98)
Unrealized gain (loss) on insured derivatives 116 1,538 (1,307) (674)
Net change in fair value of insured derivatives (75) 1,474 (1,853) (772)
Net gains (losses) on financial instruments at fair value and foreign exchange (103) (2) (127) (48)
Investment losses related to other-than-temporary impairments:        
Investment losses related to other-than-temporary impairments (6) (22) (13) (187)
Other-than-temporary impairments recognized in accumulated other comprehensive loss (14) 9 (20) 144
Net investment losses related to other-than-temporary impairments (20) (13) (33) (43)
Net gains (losses) on extinguishment of debt   18 26 18
Other net realized gains (losses)   19 5 19
Expenses:        
Losses and loss adjustment 50 (73) 14 142
Amortization of deferred acquisition costs 23 14 39 37
Operating 75 69 150 131
Interest 75 81 150 165
Variable Interest Entity, Primary Beneficiary [Member]
        
Premiums earned:        
Net investment income 16 13 34 28
Change in fair value of insured derivatives:        
Net gains (losses) on financial instruments at fair value and foreign exchange 22 291 (85) 414
Investment losses related to other-than-temporary impairments:        
Net gains (losses) on extinguishment of debt   3   4
Other net realized gains (losses) 3   3 (74)
Expenses:        
Operating 7 4 17 10
Interest $ 15 $ 14 $ 30 $ 27