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Business Dispositions and Discontinued Operations - Carrying Value of Assets and Liabilities to be Transferred in Connection With the Sale (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale | $ 177 | $ 0
Disposal Group, Including Discontinued Operation, Liabilities | 158 | $ 0
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash and investments | 142 |
Other assets | 35 |
Assets held for sale | 177 |
Net reserves transferred to liabilities held for sale | 84 |
Disposal Group, Including Discontinued Operation, Deferred Revenue | 31 |
Other liabilities | 43 |
Disposal Group, Including Discontinued Operation, Liabilities | 158 |
Consideration received | 14 |
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fair Value, Recurring [Member] | Securities available-for-sale and other | Fixed Maturities and Short-Term Investments [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 84 |
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fair Value, Recurring [Member] | Securities available-for-sale and other | Fixed Maturities and Short-Term Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 1 |
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fair Value, Recurring [Member] | Securities available-for-sale and other | Fixed Maturities and Short-Term Investments [Member] | Significant Observable Inputs (Level 2) |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 83 |
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fair Value, Nonrecurring [Member] | Securities available-for-sale and other | Fixed Maturities and Short-Term Investments [Member] | Significant Unobservable Inputs (Level 3) |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | $ 70 |

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