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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Revenues $ 530 [1] $ 616 [2] $ 644 [2]
Net change in fair value of insured derivatives 129 459 232
Net gains (losses) on financial instruments at fair value and foreign exchange 63 78 69
Net investment losses related to other-than-temporary impairments (13) (15)  
Net gains (losses) on extinguishment of debt (1) 3 60
Other net realized gains (losses) 17 28 (29)
Revenues of consolidated VIEs 128 101 233
Inter-segment revenues 0 [3] 0 [4] 0 [4]
Total revenues 853 1,270 1,209
Losses and loss adjustment 123 133 117
Operating 190 239 384
Interest 199 210 236
Expenses of consolidated VIEs 52 47 56
Inter-segment expenses 0 [3] 0 [4] 0 [4]
Total expenses 564 629 793
Income (loss) before income taxes 289 641 416
Provision (benefit) for income taxes 109 72 166
Net income (loss) 180 569 250
Identifiable assets 14,855 16,284 16,953
U S Public Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Losses and loss adjustment 5 (10) 105
Operating Segments [Member] | U S Public Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Revenues 389 [1] 373 [2] 425 [2]
Net change in fair value of insured derivatives   1 3
Net gains (losses) on financial instruments at fair value and foreign exchange 14 26 29
Net investment losses related to other-than-temporary impairments (10) (15)  
Other net realized gains (losses) (4) 14 (29)
Inter-segment revenues 34 [3] 44 [4] 90 [4]
Total revenues 423 443 518
Losses and loss adjustment 5 (10) 105
Operating 38 38 66
Inter-segment expenses 89 [3] 78 [4] 96 [4]
Total expenses 132 106 267
Income (loss) before income taxes 291 337 251
Provision (benefit) for income taxes 100 115 82
Net income (loss) 191 222 169
Identifiable assets 5,265 5,887 6,056
Operating Segments [Member] | Corporate Operations [Member]      
Segment Reporting Information [Line Items]      
Revenues 27 [1] 42 [2] 55 [2]
Net gains (losses) on financial instruments at fair value and foreign exchange 58 55 15
Net investment losses related to other-than-temporary impairments (3)    
Net gains (losses) on extinguishment of debt (1) 3 22
Other net realized gains (losses) 21 2  
Revenues of consolidated VIEs     (14)
Inter-segment revenues 67 [3] 46 [4] 85 [4]
Total revenues 169 148 163
Operating 79 87 157
Interest 97 101 124
Inter-segment expenses 7 [3] 15 [4] 7 [4]
Total expenses 183 203 288
Income (loss) before income taxes (14) (55) (125)
Provision (benefit) for income taxes 7 (173) (15)
Net income (loss) (21) 118 (110)
Identifiable assets 2,606 2,846 2,641
Operating Segments [Member] | International And Structured Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Revenues 114 [1] 189 [2] 148 [2]
Net change in fair value of insured derivatives 129 458 229
Net gains (losses) on financial instruments at fair value and foreign exchange (9)   24
Other net realized gains (losses)   12  
Revenues of consolidated VIEs 128 105 237
Inter-segment revenues 63 [3] 55 [4] 78 [4]
Total revenues 425 819 716
Losses and loss adjustment 118 143 12
Operating 73 72 108
Interest 102 109 112
Expenses of consolidated VIEs 52 47 50
Inter-segment expenses 64 [3] 64 [4] 136 [4]
Total expenses 409 435 418
Income (loss) before income taxes 16 384 298
Provision (benefit) for income taxes 3 134 101
Net income (loss) 13 250 197
Identifiable assets 9,882 10,086 11,687
Operating Segments [Member] | Advisory Services [Member]      
Segment Reporting Information [Line Items]      
Revenues [2]   12 16
Net gains (losses) on financial instruments at fair value and foreign exchange   (3) 1
Revenues of consolidated VIEs   (8)  
Inter-segment revenues [4]   22 26
Total revenues   23 43
Operating   42 53
Inter-segment expenses [4]   6 7
Total expenses   48 60
Income (loss) before income taxes   (25) (17)
Provision (benefit) for income taxes   (6) (5)
Net income (loss)   (19) (12)
Identifiable assets   793 44
Operating Segments [Member] | Conduit [Member]      
Segment Reporting Information [Line Items]      
Revenues of consolidated VIEs   4 10
Inter-segment revenues [4]   (1) (9)
Total revenues   3 1
Expenses of consolidated VIEs     6
Inter-segment expenses [4]   9 26
Total expenses   9 32
Income (loss) before income taxes   (6) (31)
Provision (benefit) for income taxes     (10)
Net income (loss)   (6) (21)
Identifiable assets   0 177
Intersegment Elimination [Member]      
Segment Reporting Information [Line Items]      
Net gains (losses) on extinguishment of debt [5]     38
Inter-segment revenues (164) [3] (166) [4] (270) [4]
Total revenues (164) (166) (232)
Inter-segment expenses (160) [3] (172) [4] (272) [4]
Total expenses (160) (172) (272)
Income (loss) before income taxes (4) 6 40
Provision (benefit) for income taxes (1) 2 13
Net income (loss) (3) 4 27
Identifiable assets $ (2,898) [6] $ (3,328) [7] $ (3,652) [7]
[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 the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment management fees and other fees.
[3] Represents intercompany premium income and expense and intercompany interest income and expense pertaining to intercompany receivables and payables.
[4] Represents intercompany premium income and expense, intercompany asset management fees and expenses and intercompany interest income and expense pertaining to intercompany receivables and payables and intercompany loans.
[5] Represents the gain on the debt received as consideration in connection with the settlement with Bank of America.
[6] Consists of intercompany deferred income taxes, reinsurance balances and repurchase agreements.
[7] Consists of intercompany reinsurance balances, repurchase agreements and deferred income taxes.