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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |
Impact of VIE Consolidation on Gross Loss and Loss Reserves |  |  | $ 0 |  | $ (72)
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |  |
Beginning gross loss and loss expense reserves | $ (482) | $ (107) |  |  |
Less reinsurance on loss and loss expense reserves | 26 | 23 |  |  |
Beginning balance of net loss and loss expense reserves | (508) | (130) |  |  |
Current Year Claims and Claims Adjustment Expense | 16 | 1 |  |  |
Prior Year Claims and Claims Adjustment Expense | 116 | (122) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 132 | (121) |  |  |
Claim and loss expense payments, net of subrogation and reinsurance | 0 | 0 |  |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | (61) | (194) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid | 61 | 194 |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) | 0 | (1) |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | (508) | (130) | (437) | $ (508) | (446)
Add reinsurance on loss and loss expense reserves | 35 | 27 |  |  |
Ending gross loss and loss expense reserves | (401) | (491) |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 11 | 6 |  |  |
Net Incurred RMBS Subrogation Recoveries | $ 30 | $ (8) |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  |  | $ 1 | $ 0 | $ 0

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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims expected to be paid or incurred by the ceding insurer. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount of foreign currency gain (loss) which decreases (increases) the cost of settling unpaid claims after deduction of reinsurance recoveries. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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