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Investments - Reconciliation of Other than Temporary Impairment on Fixed Maturity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance at the beginning of the period $ 0   $ 0  
Increases attributable to credit losses on securities:        
OTTI was previously recognized 0   0  
OTTI was not previously recognized 0   0  
Balance at the end of the period $ 0   $ 0  
Predecessor        
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Balance at the beginning of the period   $ 3   $ 3
Increases attributable to credit losses on securities:        
OTTI was previously recognized   0   0
OTTI was not previously recognized   $ 0   $ 0