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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 38.00% 41.00%  
Reserves associated with modified coinsurance reinsurance arrangements $ 530 $ 571  
Reinsurance receivable 4,900 5,300  
Liabilities for funds withheld 1,761 1,976  
Swiss Re [Member]      
Ceded Credit Risk [Line Items]      
Reinsurance receivable 1,800 2,100  
Trust funded by Swiss Re to support reinsurance receivable 2,500    
Liabilities for funds withheld 269    
Liabilities for reinsurance related embedded derivatives 46    
Amount of amortization, after-tax, of deferred gain on business sold to Swiss Re $ 15 $ 48 $ 48