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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