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Business Dispositions - Carrying Value of Assets and Liabilities to be Transferred in Sale (Details) - Continental Europe Operations [Member] - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
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
Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other    
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
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    
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
Significant Observable Inputs (Level 2) | Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other    
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
Significant Unobservable Inputs (Level 3) | Fair Value, Nonrecurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Securities available-for-sale and other    
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