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Related Party Transactions (Effects of Affiliated Reinsurance on Statements of Operations) (Details) - Affiliated Entity - Assumed - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Premiums:    
Reinsurance assumed $ 0 $ 0
Universal life and investment-type product policy fees:    
Reinsurance assumed 2 1
Other revenues:    
Reinsurance assumed 0 1
Policyholder benefits and claims:    
Reinsurance assumed 17 7
Other Expenses [Abstract]    
Assumed Other Expenses $ (5) $ (7)