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Investments (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Net Investment Income [Line Items]          
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments $ 1,115,000,000   $ 1,115,000,000   $ 1,411,000,000
Derivative, notional amount 174,000,000   174,000,000   167,000,000
Derivative fair value 6,000,000   6,000,000    
Derivative fair value         $ 3,000,000
Future capital call commitments for limited partnership investments 605,000,000   605,000,000    
Mortgage loan commitments 16,000,000   16,000,000    
Commitments to purchase or fund privately placed debt securities 282,000,000   282,000,000    
Commitments to sell various privately placed debt securities 87,000,000   87,000,000    
Common Stock          
Net Investment Income [Line Items]          
Net realized investment gains (losses) (2,000,000)   (2,000,000)    
Preferred stock          
Net Investment Income [Line Items]          
Net realized investment gains (losses) $ 2,000,000   $ (23,000,000)    
Senior notes 7.350%, face amount $350, due November 15, 2019 | Senior Notes          
Net Investment Income [Line Items]          
Net realized investment gains (losses)   $ (42,000,000)   $ (42,000,000)  
Senior notes redeemed   $ 350,000,000   $ 350,000,000