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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Ceded Credit Risk [Line Items]    
Maximum retention per single insured life on fixed and VUL insurance contracts $ 20  
Percent of mortality risk reinsured on newly issued non-term life insurance contracts 25.00%  
Percent of total individual life in-force amount reinsured 46.00% 38.00%
Reserves associated with modified coinsurance reinsurance arrangements $ 433 $ 530
Liabilities for funds withheld 1,740 1,761
Reinsurance recoverables 17,748 4,907
Swiss Re [Member]    
Ceded Credit Risk [Line Items]    
Reinsurance receivable 1,500 $ 1,800
Trust funded by Swiss Re to support reinsurance receivable 2,400  
Liabilities for funds withheld 177  
Liabilities for reinsurance related embedded derivatives 24  
Athene Holding Ltd. [Member]    
Ceded Credit Risk [Line Items]    
Deferred gain on business sold through reinsurance 8  
Deposit assets 7,500  
Athene Holding Ltd. [Member] | AFS Securities [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 6,500  
Athene Holding Ltd. [Member] | Trading Securities [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 559  
Athene Holding Ltd. [Member] | Commercial Mortgage Loans [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 72  
Athene Holding Ltd. [Member] | Derivative Instruments [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 60  
Athene Holding Ltd. [Member] | Cash [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 265  
Protective [Member]    
Ceded Credit Risk [Line Items]    
Trust funded by Swiss Re to support reinsurance receivable 13,700  
Reinsurance recoverables $ 12,100