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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | $ 53 | $ 70 | $ 108 | $ 147 |
Net change in fair value of insured derivatives |  | (1) | (7) | 13 | (12) |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | (26) | 22 | (4) | 13 |
Net investment losses related to other-than-temporary impairments |  | (9) | (1) | (37) | (2) |
Other net realized gains (losses) |  | 1 |  | 2 | (1) |
Revenues of consolidated VIEs |  | 12 | (72) | (2) | (60) |
Inter-segment revenues | [2] | 0 | 0 | 0 | 0 |
Total revenues |  | 30 | 12 | 80 | 85 |
Losses and loss adjustment |  | 140 | 59 | 102 | 131 |
Operating |  | 21 | 23 | 51 | 47 |
Interest |  | 52 | 52 | 104 | 103 |
Expenses of consolidated VIEs |  | 24 | 24 | 49 | 46 |
Inter-segment expenses | [2] | 0 | 0 | 0 | 0 |
Total expenses |  | 237 | 158 | 306 | 327 |
Income (loss) before income taxes |  | (207) | (146) | (226) | (242) |
Identifiable assets |  | 8,647 | 8,730 | 8,647 | 8,730 | $ 8,107
Operating Segments [Member] | U S Public Finance Insurance [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | 38 | 41 | 76 | 94 |
Net change in fair value of insured derivatives |  | 0 | 0 | 0 | 0 |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | 17 | (8) | 57 | (14) |
Net investment losses related to other-than-temporary impairments |  | (9) | (1) | (37) | (2) |
Other net realized gains (losses) |  | 0 |  | 1 | 0 |
Revenues of consolidated VIEs |  | 20 | 0 | 6 | 0 |
Inter-segment revenues | [2] | 8 | 6 | 15 | 13 |
Total revenues |  | 74 | 38 | 118 | 91 |
Losses and loss adjustment |  | 106 | 59 | 56 | 136 |
Operating |  | 2 | 6 | 4 | 9 |
Interest |  | 0 | 0 | 0 | 0 |
Expenses of consolidated VIEs |  | 0 | 0 | 0 | 0 |
Inter-segment expenses | [2] | 12 | 9 | 27 | 24 |
Total expenses |  | 120 | 74 | 87 | 169 |
Income (loss) before income taxes |  | (46) | (36) | 31 | (78) |
Identifiable assets |  | 5,011 | 4,412 | 5,011 | 4,412 |
Operating Segments [Member] | Corporate Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | 8 | 7 | 15 | 14 |
Net change in fair value of insured derivatives |  | 0 | 0 | 0 | 0 |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | (33) | 28 | (51) | 31 |
Net investment losses related to other-than-temporary impairments |  | 0 | 0 | 0 | 0 |
Other net realized gains (losses) |  | 0 |  | (1) | (2) |
Revenues of consolidated VIEs |  | 0 | 0 | 0 | 0 |
Inter-segment revenues | [2] | 14 | 11 | 33 | 24 |
Total revenues |  | (11) | 46 | (4) | 67 |
Losses and loss adjustment |  | 0 | 0 | 0 | 0 |
Operating |  | 16 | 13 | 38 | 26 |
Interest |  | 20 | 20 | 39 | 40 |
Expenses of consolidated VIEs |  | 0 | 0 | 0 | 0 |
Inter-segment expenses | [2] | 5 | 3 | 11 | 9 |
Total expenses |  | 41 | 36 | 88 | 75 |
Income (loss) before income taxes |  | (52) | 10 | (92) | (8) |
Identifiable assets |  | 1,123 | 1,100 | 1,123 | 1,100 |
Operating Segments [Member] | International And Structured Finance Insurance [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | 7 | 22 | 17 | 39 |
Net change in fair value of insured derivatives |  | (1) | (7) | 13 | (12) |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | (10) | 2 | (10) | (4) |
Net investment losses related to other-than-temporary impairments |  | 0 | 0 | 0 | 0 |
Other net realized gains (losses) |  | 1 |  | 2 | 1 |
Revenues of consolidated VIEs |  | (9) | (72) | (9) | (60) |
Inter-segment revenues | [2] | 6 | 6 | 9 | 13 |
Total revenues |  | (6) | (49) | 22 | (23) |
Losses and loss adjustment |  | 34 | 0 | 46 | (5) |
Operating |  | 3 | 4 | 9 | 12 |
Interest |  | 32 | 32 | 65 | 63 |
Expenses of consolidated VIEs |  | 24 | 24 | 49 | 46 |
Inter-segment expenses | [2] | 10 | 12 | 18 | 18 |
Total expenses |  | 103 | 72 | 187 | 134 |
Income (loss) before income taxes |  | (109) | (121) | (165) | (157) |
Identifiable assets |  | 4,678 | 5,248 | 4,678 | 5,248 |
Intersegment Elimination [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | [1] | 0 | 0 | 0 | 0 |
Net change in fair value of insured derivatives |  | 0 | 0 | 0 | 0 |
Net gains (losses) on financial instruments at fair value and foreign exchange |  | 0 | 0 | 0 | 0 |
Net investment losses related to other-than-temporary impairments |  | 0 | 0 | 0 | 0 |
Other net realized gains (losses) |  | 0 |  | 0 | 0 |
Revenues of consolidated VIEs |  | 1 | 0 | 1 | 0 |
Inter-segment revenues | [2] | (28) | (23) | 57 | (50) |
Total revenues |  | (27) | (23) | (56) | (50) |
Losses and loss adjustment |  | 0 | 0 | 0 | 0 |
Operating |  | 0 | 0 | 0 | 0 |
Interest |  | 0 | 0 | 0 | 0 |
Expenses of consolidated VIEs |  | 0 | 0 | 0 | 0 |
Inter-segment expenses | [2] | (27) | (24) | (56) | (51) |
Total expenses |  | (27) | (24) | (56) | (51) |
Income (loss) before income taxes |  | 0 | 1 |  | 1 |
Identifiable assets | [3] | $ (2,165) | $ (2,030) | $ (2,165) | $ (2,030) |
[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 primarily of intercompany reinsurance balances and repurchase agreements.

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