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Business Segments (Summary Of Company's Operations) (Details) (USD $)
In Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Revenues $ 255 [1] $ 274 [1] $ 520 [1] $ 675 [1]  
Realized gains and other settlements on insured derivatives (191) (64) (546) (98)  
Unrealized Gain Loss On Derivatives 116 1,538 (1,307) (674)  
Net gains (losses) on financial instruments at fair value and foreign exchange (103) (2) (127) (48)  
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  
Revenues of consolidated VIEs 41 307 (48) 372  
Total revenues 98 2,077 (1,510) 221  
Loss and loss adjustment expense 50 (73) 14 142  
Operating expenses 98 83 189 168  
Interest expense 75 81 150 165  
Expenses of consolidated VIEs 22 18 47 37  
Total expenses 245 109 400 512  
Income (loss) before income taxes (147) 1,968 (1,910) (291)  
Identifiable assets 31,668 33,464 31,668 33,464 32,279
Non Variable Interest Entities [Member]
          
Realized gains and other settlements on insured derivatives (191) (64) (546) (98)  
Unrealized Gain Loss On Derivatives 116 1,538 (1,307) (674)  
Net gains (losses) on financial instruments at fair value and foreign exchange (103) (2) (127) (48)  
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  
Loss and loss adjustment expense 50 (73) 14 142  
Interest expense 75 81 150 165  
U.S. Public Finance Insurance [Member]
          
Revenues 143 [1] 153 [1] 274 [1] 317 [1]  
Realized gains and other settlements on insured derivatives 1 0 1 0  
Unrealized Gain Loss On Derivatives   0   0  
Net gains (losses) on financial instruments at fair value and foreign exchange 13 1 17 3  
Other net realized gains (losses)   0   0  
Inter-segment revenues 20 [2] 25 [2] 37 [2] 52 [2]  
Total revenues 177 179 329 372  
Loss and loss adjustment expense (8) 11 (5) 36  
Operating expenses 14 11 26 19  
Inter-segment expenses 27 [2] 29 [2] 53 [2] 57 [2]  
Total expenses 33 51 74 112  
Income (loss) before income taxes 144 128 255 260  
Identifiable assets 8,083 8,374 8,083 8,374  
Structured Finance and International Insurance [Member]
          
Revenues 81 [1] 82 [1] 183 [1] 280 [1]  
Realized gains and other settlements on insured derivatives (192) (64) (547) (98)  
Unrealized Gain Loss On Derivatives 116 1,538 (1,307) (674)  
Net gains (losses) on financial instruments at fair value and foreign exchange   (16) 33 (14)  
Net investment losses related to other-than-temporary impairments (2) (1) (4) (4)  
Other net realized gains (losses)   19 1 19  
Revenues of consolidated VIEs 37 280 (67) 330  
Inter-segment revenues 19 [2] 26 [2] 30 [2] 51 [2]  
Total revenues 59 1,864 (1,678) (110)  
Loss and loss adjustment expense 58 (84) 19 106  
Operating expenses 45 33 86 72  
Interest expense 33 34 66 68  
Expenses of consolidated VIEs 17 15 37 30  
Inter-segment expenses 31 [2] 38 [2] 60 [2] 74 [2]  
Total expenses 184 36 268 350  
Income (loss) before income taxes (125) 1,828 (1,946) (460)  
Identifiable assets 23,592 24,342 23,592 24,342  
Advisory Services [Member]
          
Revenues 7 [1] 8 [1] 13 [1] 14 [1]  
Realized gains and other settlements on insured derivatives          
Unrealized Gain Loss On Derivatives          
Net gains (losses) on financial instruments at fair value and foreign exchange   0   1  
Net investment losses related to other-than-temporary impairments          
Net gains (losses) on extinguishment of debt          
Other net realized gains (losses)   0   0  
Revenues of consolidated VIEs          
Inter-segment revenues 10 [2] 9 [2] 19 [2] 19 [2]  
Total revenues 17 17 32 34  
Loss and loss adjustment expense          
Operating expenses 18 16 33 28  
Interest expense          
Expenses of consolidated VIEs          
Inter-segment expenses 2 [2] 1 [2] 3 [2] 3 [2]  
Total expenses 20 17 36 31  
Income (loss) before income taxes (3)   (4) 3  
Identifiable assets 52 51 52 51  
Corporate Operations [Member]
          
Revenues   1 [1] 1 [1] 2 [1]  
Realized gains and other settlements on insured derivatives          
Unrealized Gain Loss On Derivatives          
Net gains (losses) on financial instruments at fair value and foreign exchange 16 8 39 (18)  
Net investment losses related to other-than-temporary impairments          
Net gains (losses) on extinguishment of debt   0   0  
Other net realized gains (losses)          
Revenues of consolidated VIEs          
Inter-segment revenues 22 [2] 23 [2] 44 [2] 50 [2]  
Total revenues 38 32 84 34  
Loss and loss adjustment expense          
Operating expenses 21 21 43 46  
Interest expense 15 16 30 33  
Expenses of consolidated VIEs          
Inter-segment expenses 3 [2] 4 [2] 7 [2] 6 [2]  
Total expenses 39 41 80 85  
Income (loss) before income taxes (1) (9) 4 (51)  
Identifiable assets 671 1,317 671 1,317  
Wind-Down Operations [Member]
          
Revenues 24 [1],[3] 30 [1],[3] 49 [1],[3] 62 [1],[3]  
Net gains (losses) on financial instruments at fair value and foreign exchange (132) 5 (216) (20)  
Net investment losses related to other-than-temporary impairments (18) (12) (29) (39)  
Net gains (losses) on extinguishment of debt   18 24 18  
Other net realized gains (losses)   0 4 0  
Revenues of consolidated VIEs 4 27 19 42  
Inter-segment revenues (4) [2],[4] (5) [2],[4] (8) [2],[4] (10) [2],[4]  
Total revenues (126) 63 (157) 53  
Operating expenses   2 1 3  
Interest expense 27 31 54 64  
Expenses of consolidated VIEs 5 3 10 7  
Inter-segment expenses 9 [2],[4] 16 [2],[4] 18 [2],[4] 34 [2],[4]  
Total expenses 41 52 83 108  
Income (loss) before income taxes (167) 11 (240) (55)  
Identifiable assets 5,640 7,389 5,640 7,389  
Eliminations [Member]
          
Net gains (losses) on extinguishment of debt     2    
Inter-segment revenues (67) [2] (78) [2] (122) [2] (162) [2]  
Total revenues (67) (78) (120) (162)  
Inter-segment expenses (72) [2] (88) [2] (141) [2] (174) [2]  
Total expenses (72) (88) (141) (174)  
Income (loss) before income taxes 5 10 21 12  
Identifiable assets $ (6,370) [5] $ (8,009) [5] $ (6,370) [5] $ (8,009) [5]  
[1] Represents the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment management fees and other fees.
[2] Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.
[3]
[4] Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.
[5] Consists of intercompany reinsurance balances, repurchase agreements and loans.