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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Security
Dec. 31, 2017
USD ($)
Security
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months $ 18,359  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (767)  
Available-for-sale securities, Fair Value, Total 18,359  
Available-for-sale Securities, Gross Unrealized Losses, Total $ (767)  
Total number of available-for-sale securities in an unrealized loss position less than twelve months | Security 2,049  
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | Security 0  
Total number of available-for-sale securities in an unrealized loss position | Security 2,049  
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized Losses Related To Non Credit Portion Of Other Than Temporary Impairments Included In Accumulated Other Comprehensive Income   $ 0
Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months $ 2,863  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (28)  
Available-for-sale securities, Fair Value, Total 2,863  
Available-for-sale Securities, Gross Unrealized Losses, Total (28)  
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 1,208  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (25)  
Available-for-sale securities, Fair Value, Total 1,208  
Available-for-sale Securities, Gross Unrealized Losses, Total (25)  
Corporates    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 10,956  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (608)  
Available-for-sale securities, Fair Value, Total 10,956  
Available-for-sale Securities, Gross Unrealized Losses, Total (608)  
Hybrids    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 796  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (36)  
Available-for-sale securities, Fair Value, Total 796  
Available-for-sale Securities, Gross Unrealized Losses, Total (36)  
Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 1,356  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (53)  
Available-for-sale securities, Fair Value, Total 1,356  
Available-for-sale Securities, Gross Unrealized Losses, Total (53)  
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 898  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (9)  
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer 0  
Available-for-sale securities, Fair Value, Total 898  
Available-for-sale Securities, Gross Unrealized Losses, Total (9)  
U.S. Government    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 139  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (2)  
Available-for-sale securities, Fair Value, 12 months or longer 0  
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer 0  
Available-for-sale securities, Fair Value, Total 139  
Available-for-sale Securities, Gross Unrealized Losses, Total (2)  
Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months 143  
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months (6)  
Available-for-sale securities, Fair Value, 12 months or longer 0  
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer 0  
Available-for-sale securities, Fair Value, Total 143  
Available-for-sale Securities, Gross Unrealized Losses, Total $ (6)  
Predecessor    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   7,940
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (31)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   7,940
Available-for-sale Securities, Gross Unrealized Losses, Total   $ (31)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | Security   1,182
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | Security   0
Total number of available-for-sale securities in an unrealized loss position | Security   1,182
Predecessor | Asset-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   $ 1,944
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (3)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   1,944
Available-for-sale Securities, Gross Unrealized Losses, Total   (3)
Predecessor | Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   478
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (1)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   478
Available-for-sale Securities, Gross Unrealized Losses, Total   (1)
Predecessor | Corporates    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   3,814
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (19)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   3,814
Available-for-sale Securities, Gross Unrealized Losses, Total   (19)
Predecessor | Hybrids    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   266
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (3)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   266
Available-for-sale Securities, Gross Unrealized Losses, Total   (3)
Predecessor | Municipals    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   285
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (1)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   285
Available-for-sale Securities, Gross Unrealized Losses, Total   (1)
Predecessor | Residential mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   939
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (3)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   939
Available-for-sale Securities, Gross Unrealized Losses, Total   (3)
Predecessor | U.S. Government    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   74
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   0
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   74
Available-for-sale Securities, Gross Unrealized Losses, Total   0
Predecessor | Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Fair Value, Less than 12 months   140
Available-for-sale securities, Gross Unrealized Losses, Less than 12 months   (1)
Available-for-sale securities, Fair Value, 12 months or longer   0
Available-for-sale Securities, Gross Unrealized Losses, 12 months or longer   0
Available-for-sale securities, Fair Value, Total   140
Available-for-sale Securities, Gross Unrealized Losses, Total   $ (1)