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Business Dispositions - Carrying Value of Assets and Liabilities to be Transferred in Sale (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale | $ 0 | $ 177
Disposal Group, Including Discontinued Operation, Liabilities, Total | 0 | 158
Continental Europe Operations [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents | 150 | 142
Disposal Group, Including Discontinued Operation, Other Assets | 13 | 35
Assets held for sale | 163 | 177
Net change in reserves transferred to liabilities held for sale | 81 | 84
Disposal Group, Including Discontinued Operation, Deferred Revenue | 19 | 31
Disposal Group, Including Discontinued Operation, Other Liabilities | 52 | 43
Disposal Group, Including Discontinued Operation, Liabilities, Total | 152 | 158
Disposal Group, Including Discontinued Operation, Consideration | $ 11 | 14
Continental Europe Operations [Member] | Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other | Disposal Group, Disposed of by Sale, Not Discontinued Operations [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] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other | Disposal Group, Disposed of by Sale, Not Discontinued Operations [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 |  | 1
Continental Europe Operations [Member] | Significant Observable Inputs (Level 2) | Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other | Disposal Group, Disposed of by Sale, Not Discontinued Operations [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 |  | 83
Continental Europe Operations [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Nonrecurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other | Disposal Group, Disposed of by Sale, Not Discontinued Operations [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 |  | $ 70

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