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Business Dispositions - Carrying Value of Assets and Liabilities to be Transferred in Sale (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Assets held for sale $ 167 $ 177
Disposal Group, Including Discontinued Operation, Liabilities, Total 151 158
Continental Europe 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 153 142
Disposal Group, Including Discontinued Operation, Other Assets 14 35
Assets held for sale 167 177
Disposal Group, Including Discontinued Operation, Unpaid losses and loss adjustment expenses 82 84
Disposal Group, Including Discontinued Operation, Deferred Revenue 19 31
Disposal Group, Including Discontinued Operation, Other Liabilities 50 43
Disposal Group, Including Discontinued Operation, Liabilities, Total 151 158
Disposal Group, Including Discontinued Operation, Consideration 12 14
Continental Europe Operations [Member] | Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Available-for-sale Securities [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 79 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] | Available-for-sale Securities [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 2 1
Continental Europe Operations [Member] | Significant
Observable
Inputs
(Level 2) | Fair Value, Recurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Available-for-sale Securities [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 77 83
Continental Europe Operations [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Fixed Maturities and Short-Term Investments [Member] | Available-for-sale Securities [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 $ 67 $ 70