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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Revenues [1] $ 370 $ 480 $ 530
Net change in fair value of insured derivatives (51) (19) 129
Net gains (losses) on financial instruments at fair value and foreign exchange (24) 84 63
Net investment losses related to other-than-temporary impairments (106) (5) (13)
Net gains (losses) on extinguishment of debt 28 5 (1)
Other net realized gains (losses) 31 (282) 17
Revenues of consolidated VIEs 185 31 128
Inter-segment revenues [2] 0 0 0
Total revenues 433 294 853
Losses and loss adjustment 683 220 123
Operating 129 177 190
Interest 197 197 199
Expenses of consolidated VIEs 85 39 52
Inter-segment expenses 0 0 0
Total expenses 1,094 633 564
Income (loss) before income taxes (661) (339) 289
Provision (benefit) for income taxes 944 (1) 109
Net income (loss) (1,605) (338) 180
Identifiable assets 9,095 11,137 14,836
U S Public Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Losses and loss adjustment 499 74 5
Operating Segments [Member] | U S Public Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 262 335 389
Net gains (losses) on financial instruments at fair value and foreign exchange 25 72 14
Net investment losses related to other-than-temporary impairments (106) (4) (10)
Other net realized gains (losses) (4) 2 (4)
Inter-segment revenues [2] 23 22 34
Total revenues 200 427 423
Losses and loss adjustment 499 74 5
Operating 36 40 38
Inter-segment expenses 72 69 89
Total expenses 607 183 132
Income (loss) before income taxes (407) 244 291
Provision (benefit) for income taxes (152) 68 100
Net income (loss) (255) 176 191
Identifiable assets 4,582 5,077 5,265
Operating Segments [Member] | Corporate Operations [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 30 24 27
Net gains (losses) on financial instruments at fair value and foreign exchange (32) (14) 58
Net investment losses related to other-than-temporary impairments   (1) (3)
Net gains (losses) on extinguishment of debt 28 5 (1)
Other net realized gains (losses) (4) (5) 21
Inter-segment revenues [2] 60 58 67
Total revenues 82 67 169
Operating 59 80 79
Interest 81 91 97
Inter-segment expenses 11 4 7
Total expenses 151 175 183
Income (loss) before income taxes (69) (108) (14)
Provision (benefit) for income taxes 556 (15) 7
Net income (loss) (625) (93) (21)
Identifiable assets 1,312 2,479 2,599
Operating Segments [Member] | International And Structured Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 78 121 114
Net change in fair value of insured derivatives (51) (19) 129
Net gains (losses) on financial instruments at fair value and foreign exchange (17) 26 (9)
Other net realized gains (losses) 39 (279)  
Revenues of consolidated VIEs 185 31 128
Inter-segment revenues [2] 44 51 63
Total revenues 278 (69) 425
Losses and loss adjustment 184 146 118
Operating 34 57 73
Interest 116 106 102
Expenses of consolidated VIEs 85 39 52
Inter-segment expenses 47 52 64
Total expenses 466 400 409
Income (loss) before income taxes (188) (469) 16
Provision (benefit) for income taxes 1,143 (52) 3
Net income (loss) (1,331) (417) 13
Identifiable assets 5,404 6,486 9,870
Intersegment Elimination [Member]      
Segment Reporting Information [Line Items]      
Inter-segment revenues [2] (127) (131) (164)
Total revenues (127) (131) (164)
Inter-segment expenses (130) (125) (160)
Total expenses (130) (125) (160)
Income (loss) before income taxes 3 (6) (4)
Provision (benefit) for income taxes (603) (2) (1)
Net income (loss) 606 (4) (3)
Identifiable assets $ (2,203) [3] $ (2,905) [4] $ (2,898) [4]
[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.
[4]
Consists of intercompany deferred income taxes, reinsurance balances and repurchase agreements.