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Investments (Details) - Fixed Maturities Narrative - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment disclosure details      
Fixed maturities, at fair value $ 63,464 $ 62,694  
Securities on loan as part of a tri-party lending agreement 367 304  
Proceeds from sales of fixed maturities classified as available for sale 3,546 1,854 $ 1,417
Gross realized gains on sales of fixed maturities 51 42 79
Gross realized losses on sales of fixed maturities 18 38 $ 20
Insurance subsidiaries' securities on deposit at financial institutions in certain states pursuant to the respective states' insurance regulatory requirements 4,230 4,410  
Fair value of funds deposited with third parties to be used as collateral to secure various liabilities on behalf of insureds, cedants and other creditors 37 35  
Fair value of other investments pledged as collateral securing outstanding letters of credit 1 1  
Subsidiary [Member]      
Investment disclosure details      
Fair value of owned securities pledged into a Lloyd's trust account to support capital requirements for the Company's operations at Lloyd's 115 37  
TRV [Member]      
Investment disclosure details      
Fixed maturities, at fair value 84 82  
Fair value of owned securities pledged into a Lloyd's trust account to support capital requirements for the Company's operations at Lloyd's 33 33  
Obligations of states, municipalities and political subdivisions, pre-refunded [Member]      
Investment disclosure details      
Fixed maturities, at fair value 2,852 3,899  
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member]      
Investment disclosure details      
Fixed maturities, at fair value 2,573 2,410  
Residential mortgage-backed pass-through securities classified as available-for-sale, GNMA, FNMA, FHLMC and Canadian Government [Member]      
Investment disclosure details      
Fixed maturities, at fair value 859 804  
Residential collateralized mortgage obligations [Member]      
Investment disclosure details      
Fixed maturities, at fair value $ 1,710 $ 1,610  
Percent guaranteed by or fully collateralized by securities issued by GNMA, FNMA or FHLMC 52.00% 55.00%  
Non-guaranteed residential collateralized mortgage obligations [Member]      
Investment disclosure details      
Fixed maturities, at fair value $ 828 $ 717  
Commercial mortgage-backed securities [Member]      
Investment disclosure details      
Fixed maturities, at fair value 1,220 1,170  
Commercial mortgage-backed securities, containing guarantees by the U.S. government or a government-sponsored enterprise [Member]      
Investment disclosure details      
Fixed maturities, at fair value 458 475  
Commercial mortgage-backed securities, non-guaranteed securities [Member]      
Investment disclosure details      
Fixed maturities, at fair value $ 759 $ 693