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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Revenues [1] $ 87 $ 111 $ 190 $ 226  
Net change in fair value of insured derivatives 3 (8) (50) (36)  
Net gains (losses) on financial instruments at fair value and foreign exchange (61) 14 (44) (55)  
Net investment losses related to other-than-temporary impairments (11) 0 (13) (1)  
Net gains (losses) on extinguishment of debt 0 3 8 5  
Other net realized gains (losses) 34 0 37 (1)  
Revenues of consolidated VIEs 20 (2) 21 12  
Inter-segment revenues [2] 0 0 0 0  
Total revenues 72 118 149 150  
Losses and loss adjustment 170 77 264 99  
Operating 40 40 76 85  
Interest 50 49 98 99  
Expenses of consolidated VIEs 22 7 41 23  
Inter-segment expenses [2] 0 0 0 0  
Total expenses 282 173 479 306  
Income (loss) before income taxes (210) (55) (330) (156)  
Provision (benefit) for income taxes 1,019 (28) 971 (51)  
Net income (loss) (1,229) (27) (1,301) (105)  
Identifiable assets 9,767 12,064 9,767 12,064 $ 11,137
U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Losses and loss adjustment 158 9 169 18  
Operating Segments [Member] | U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 62 82 130 166  
Net gains (losses) on financial instruments at fair value and foreign exchange 14 25 18 34  
Net investment losses related to other-than-temporary impairments (11)   (13)    
Inter-segment revenues [2] 5 4 10 10  
Total revenues 70 111 145 210  
Losses and loss adjustment 158 9 169 18  
Operating 16 11 26 20  
Inter-segment expenses [2] 16 16 31 34  
Total expenses 190 36 226 72  
Income (loss) before income taxes (120) 75 (81) 138  
Provision (benefit) for income taxes (43) 25 (31) 47  
Net income (loss) (77) 50 (50) 91  
Identifiable assets 5,074 5,477 5,074 5,477 5,477
Operating Segments [Member] | Corporate Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 8 6 16 11  
Net gains (losses) on financial instruments at fair value and foreign exchange (55) (19) (39) (103)  
Net investment losses related to other-than-temporary impairments       (1)  
Net gains (losses) on extinguishment of debt 0 3 8 5  
Other net realized gains (losses) (1) (1) (2) (2)  
Inter-segment revenues [2] 15 12 31 28  
Total revenues (33) 1 14 (62)  
Operating 14 14 32 36  
Interest 22 24 44 47  
Inter-segment expenses [2] 1 1 2 1  
Total expenses 37 39 78 84  
Income (loss) before income taxes (70) (38) (64) (146)  
Provision (benefit) for income taxes 1,074 (18) 1,070 (42)  
Net income (loss) (1,144) (20) (1,134) (104)  
Identifiable assets 1,233 2,412 1,233 2,412 2,412
Operating Segments [Member] | International And Structured Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 17 23 44 49  
Net change in fair value of insured derivatives 3 (8) (50) (36)  
Net gains (losses) on financial instruments at fair value and foreign exchange (20) 8 (23) 14  
Other net realized gains (losses) 35 1 39 1  
Revenues of consolidated VIEs 20 (2) 21 12  
Inter-segment revenues [2] 11 11 20 23  
Total revenues 66 33 51 63  
Losses and loss adjustment 12 68 95 81  
Operating 10 15 18 29  
Interest 28 25 54 52  
Expenses of consolidated VIEs 22 7 41 23  
Inter-segment expenses [2] 14 11 28 25  
Total expenses 86 126 236 210  
Income (loss) before income taxes (20) (93) (185) (147)  
Provision (benefit) for income taxes 1,199 (32) 1,142 (55)  
Net income (loss) (1,219) (61) (1,327) (92)  
Identifiable assets 5,313 7,017 5,313 7,017 7,017
Intersegment Elimination [Member]          
Segment Reporting Information [Line Items]          
Inter-segment revenues [2] (31) (27) (61) (61)  
Total revenues (31) (27) (61) (61)  
Inter-segment expenses [2] (31) (28) (61) (60)  
Total expenses (31) (28) (61) (60)  
Income (loss) before income taxes 0 1 0 (1)  
Provision (benefit) for income taxes (1,211) (3) (1,210) (1)  
Net income (loss) 1,211 4 1,210 0  
Identifiable assets $ (1,853) [3] $ (2,842) [3] $ (1,853) [3] $ (2,842) [3] $ (2,842)
[1]
Represents the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements and other fees.
[2]
Represents intercompany premium income and expense and intercompany interest income and expense pertaining to intercompany receivables and payables.
[3]
Consists of intercompany reinsurance balances and repurchase agreements.