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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  | $ (11) | $ 0 | $ (11) | $ 0
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount |  | (8) | $ 0 | (8) | $ 0
Proceeds from Income Tax Refunds | $ 206 |  |  |  |
Non-insurance carryback [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  | 6 |  |  |
Foreign Tax Authority [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards |  | 11 |  | 11 |
Deferred Tax Assets, Valuation Allowance |  | $ 11 |  | $ 11 |
Interest Income [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Proceeds from Income Tax Refunds | $ 1 |  |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the disposition of a business not qualifying as a discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details
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