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Investments - Proceeds From The Sale of Fixed-maturity available for-sale-securities - Available-for-sale Securities - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from available-for-sale investments, sold, matured or repaid:     $ 5,865  
Total fixed maturities        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from available-for-sale investments, sold, matured or repaid: $ 662   4,310  
Gain on sale of investments 1   9  
Loss on Sale of Investments $ 26   $ 91  
Predecessor        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from available-for-sale investments, sold, matured or repaid:       $ 2,022
Predecessor | Total fixed maturities        
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from available-for-sale investments, sold, matured or repaid:   $ 174   606
Gain on sale of investments   9   23
Loss on Sale of Investments   $ 5   $ 18