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Related Party Transactions (Effects of Affiliated Reinsurance on Statements of Operations) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Premiums:    
Net premiums $ 217 $ 220
Universal life and investment-type product policy fees:    
Net universal life and investment-type product policy fees 730 824
Other revenues:    
Other revenues 62 79
Affiliated Entity    
Universal life and investment-type product policy fees:    
Net universal life and investment-type product policy fees 54 61
Affiliated Entity | Assumed    
Premiums:    
Reinsurance assumed 0 4
Universal life and investment-type product policy fees:    
Reinsurance assumed 1 26
Other revenues:    
Reinsurance assumed 1 1
Policyholder benefits and claims:    
Reinsurance assumed 7 20
Affiliated Entity | Ceded    
Premiums:    
Reinsurance ceded 0 (96)
Universal life and investment-type product policy fees:    
Reinsurance ceded 0 (1)
Other revenues:    
Reinsurance ceded 0 12
Policyholder benefits and claims:    
Reinsurance ceded 0 (84)
Affiliated Entity | Reinsurance    
Premiums:    
Net premiums 0 (92)
Universal life and investment-type product policy fees:    
Net universal life and investment-type product policy fees 1 25
Other revenues:    
Other revenues 1 13
Policyholder benefits and claims:    
Net policyholder benefits and claims $ 7 $ (64)