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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | [1] | $ 111 |  | $ 130 |  | $ 226 |  | $ 269 |  |
Net change in fair value of insured derivatives |  | (8) |  | 60 |  | (36) |  | 88 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | 14 |  | 45 |  | (55) |  | 75 |  |
Net investment losses related to other-than-temporary impairments |  |  |  | (7) |  | (1) |  | (7) |  |
Net gains (losses) on extinguishment of debt |  | 3 |  | (1) |  | 5 |  | (1) |  |
Other net realized gains (losses) |  | 0 |  | (1) |  | (1) |  | 19 |  |
Revenues of consolidated VIEs |  | (2) |  | 19 |  | 12 |  | 21 |  |
Inter-segment revenues |  |  |  | 0 |  | 0 |  | 0 |  |
Total revenues |  | 118 |  | 245 |  | 150 |  | 464 |  |
Losses and loss adjustment |  | 77 |  | 46 |  | 99 |  | 40 |  |
Operating |  | 40 |  | 45 |  | 85 |  | 93 |  |
Interest |  | 49 |  | 50 |  | 99 |  | 100 |  |
Expenses of consolidated VIEs |  | 7 |  | 12 |  | 23 |  | 26 |  |
Inter-segment expenses |  |  |  | 0 |  | 0 |  | 0 |  |
Total expenses |  | 173 |  | 153 |  | 306 |  | 259 |  |
Income (loss) before income taxes |  | (55) |  | 92 |  | (156) |  | 205 |  |
Provision (benefit) for income taxes |  | (28) |  | 28 |  | (51) |  | 72 |  |
Net income (loss) |  | (27) |  | 64 |  | (105) |  | 133 |  |
Identifiable assets |  | 12,064 |  | 15,510 |  | 12,064 |  | 15,510 |  | $ 14,836
U S Public Finance Insurance [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment |  | 9 |  | 8 |  | 18 |  | 2 |  |
Operating Segments [Member] | U S Public Finance Insurance [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | [1] | 82 |  | 93 |  | 166 |  | 198 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | 25 |  |  |  | 34 |  | 3 |  |
Net investment losses related to other-than-temporary impairments |  | 0 |  | (6) |  | 0 |  | (6) |  |
Other net realized gains (losses) |  | 0 |  |  |  | 0 |  | (4) |  |
Inter-segment revenues | [2] | 4 |  | 8 |  | 10 |  | 18 |  |
Total revenues |  | 111 |  | 95 |  | 210 |  | 209 |  |
Losses and loss adjustment |  | 9 |  | 8 |  | 18 |  | 2 |  |
Operating |  | 11 |  | 8 |  | 20 |  | 18 |  |
Inter-segment expenses | [2] | 16 |  | 22 |  | 34 |  | 46 |  |
Total expenses |  | 36 |  | 38 |  | 72 |  | 66 |  |
Income (loss) before income taxes |  | 75 |  | 57 |  | 138 |  | 143 |  |
Provision (benefit) for income taxes |  | 25 |  | 20 |  | 47 |  | 49 |  |
Net income (loss) |  | 50 |  | 37 |  | 91 |  | 94 |  |
Identifiable assets |  | 5,477 |  | 5,412 |  | 5,477 |  | 5,412 |  |
Operating Segments [Member] | Corporate Operations [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | [1] | 6 |  | 8 |  | 11 |  | 13 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | (19) |  | 48 |  | (103) |  | 80 |  |
Net investment losses related to other-than-temporary impairments |  | 0 |  | (1) |  | (1) |  | (1) |  |
Net gains (losses) on extinguishment of debt |  | 3 |  | (1) |  | 5 |  | (1) |  |
Other net realized gains (losses) |  | (1) |  | (1) |  | (2) |  | 23 |  |
Inter-segment revenues | [2] | 12 |  | 21 |  | 28 |  | 37 |  |
Total revenues |  | 1 |  | 74 |  | (62) |  | 151 |  |
Operating |  | 14 |  | 19 |  | 36 |  | 38 |  |
Interest |  | 24 |  | 24 |  | 47 |  | 49 |  |
Inter-segment expenses | [2] | 1 |  | 1 |  | 1 |  | 2 |  |
Total expenses |  | 39 |  | 44 |  | 84 |  | 89 |  |
Income (loss) before income taxes |  | (38) |  | 30 |  | (146) |  | 62 |  |
Provision (benefit) for income taxes |  | (18) |  | 7 |  | (42) |  | 25 |  |
Net income (loss) |  | (20) |  | 23 |  | (104) |  | 37 |  |
Identifiable assets |  | 2,412 |  | 2,707 |  | 2,412 |  | 2,707 |  |
Operating Segments [Member] | International And Structured Finance Insurance [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Revenues | [1] | 23 |  | 29 |  | 49 |  | 58 |  |
Net change in fair value of insured derivatives |  | (8) |  | 60 |  | (36) |  | 88 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | 8 |  | (3) |  | 14 |  | (8) |  |
Other net realized gains (losses) |  | 1 |  |  |  | 1 |  |  |  |
Revenues of consolidated VIEs |  | (2) |  | 19 |  | 12 |  | 21 |  |
Inter-segment revenues | [2] | 11 |  | 15 |  | 23 |  | 33 |  |
Total revenues |  | 33 |  | 120 |  | 63 |  | 192 |  |
Losses and loss adjustment |  | 68 |  | 38 |  | 81 |  | 38 |  |
Operating |  | 15 |  | 18 |  | 29 |  | 37 |  |
Interest |  | 25 |  | 26 |  | 52 |  | 51 |  |
Expenses of consolidated VIEs |  | 7 |  | 12 |  | 23 |  | 26 |  |
Inter-segment expenses | [2] | 11 |  | 15 |  | 25 |  | 33 |  |
Total expenses |  | 126 |  | 109 |  | 210 |  | 185 |  |
Income (loss) before income taxes |  | (93) |  | 11 |  | (147) |  | 7 |  |
Provision (benefit) for income taxes |  | (32) |  | 3 |  | (55) |  | 1 |  |
Net income (loss) |  | (61) |  | 8 |  | (92) |  | 6 |  |
Identifiable assets |  | 7,017 |  | 10,393 |  | 7,017 |  | 10,393 |  |
Intersegment Elimination [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Inter-segment revenues | [2] | (27) |  | (44) |  | (61) |  | (88) |  |
Total revenues |  | (27) |  | (44) |  | (61) |  | (88) |  |
Inter-segment expenses | [2] | (28) |  | (38) |  | (60) |  | (81) |  |
Total expenses |  | (28) |  | (38) |  | (60) |  | (81) |  |
Income (loss) before income taxes |  | 1 |  | (6) |  | (1) |  | (7) |  |
Provision (benefit) for income taxes |  | (3) |  | (2) |  | (1) |  | (3) |  |
Net income (loss) |  | 4 |  | (4) |  | 0 |  | (4) |  |
Identifiable assets |  | $ (2,842) | [3] | $ (3,002) | [4] | $ (2,842) | [3] | $ (3,002) | [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 deferred income taxes, reinsurance balances and repurchase agreements.
[4] | Consists of intercompany reinsurance balances, repurchase agreements and deferred income taxes.

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