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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Unrecognized Tax Benefits | $ 15 | $ 15 | $ 15 | $ 15 | $ 15 | $ 15 | $ 14 | $ 14
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | (6) |  |  |  |  |
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount | 0 | 5 | 0 | 5 |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | 1 | (6) | (6) | (6) |  |  |  |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount | 0 | (8) | (5) | (8) |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | (5) | $ 0 | (5) | 0 |  |  |  |
Non-insurance carryback [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  |  |  | (11) |  |  |  |
Insurance Carryback Income Tax [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount |  |  |  | $ (5) |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 23 |  | 23 |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 4 |  | $ 4 |  |  |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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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=121826272&loc=d3e32687-109319 + Details
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