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Investments (Details) - Fixed Maturities Narrative - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment disclosure details      
Fixed maturities, at fair value $ 68,134 $ 63,464  
Securities on loan as part of a tri-party lending agreement 404 367  
Proceeds from sales of fixed maturities classified as available for sale 2,187 3,546 $ 1,854
Gross realized gains on sales of fixed maturities 67 51 42
Gross realized losses on sales of fixed maturities 8 18 $ 38
Insurance subsidiaries' securities on deposit at financial institutions in certain states pursuant to the respective states' insurance regulatory requirements 4,340 4,230  
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 54 37  
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 173 115  
TRV [Member]      
Investment disclosure details      
Fixed maturities, at fair value 91 84  
Fair value of owned securities pledged into a Lloyd's trust account to support capital requirements for the Company's operations at Lloyd's 34 33  
Obligations of states, municipalities and political subdivisions, pre-refunded [Member]      
Investment disclosure details      
Fixed maturities, at fair value 2,056 2,852  
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities [Member]      
Investment disclosure details      
Fixed maturities, at fair value 3,280 2,573  
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 1,520 859  
Residential collateralized mortgage obligations [Member]      
Investment disclosure details      
Fixed maturities, at fair value $ 1,760 $ 1,710  
Percent guaranteed by or fully collateralized by securities issued by GNMA, FNMA or FHLMC 54.00% 52.00%  
Non-guaranteed residential collateralized mortgage obligations [Member]      
Investment disclosure details      
Fixed maturities, at fair value $ 816 $ 828  
Commercial mortgage-backed securities [Member]      
Investment disclosure details      
Fixed maturities, at fair value 1,510 1,220  
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 559 458  
Commercial mortgage-backed securities, non-guaranteed securities [Member]      
Investment disclosure details      
Fixed maturities, at fair value $ 950 $ 759