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Reinsurance - Narrative (Details)
3 Months Ended 9 Months Ended
Jul. 01, 2018
USD ($)
Jan. 02, 2017
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
policy
$ / shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Ceded Credit Risk [Line Items]              
Reinsurance, Loss on Uncollectible Accounts in Period, Amount     $ 0 $ 0 $ 0 $ 0  
Reinsurance Risk Charge Fee     0   $ 0    
Number of policies reinsured by foreign company not engaged in insurance | policy         0    
Funds withheld for reinsurance receivables, at fair value     708,000,000   $ 708,000,000   $ 756,000,000
Life and Annuity Insurance Product Line              
Ceded Credit Risk [Line Items]              
Ceded     0 $ 0 0 $ 0  
Reinsured risk   70.00%          
Total funds withheld for receivables with third parties              
Ceded Credit Risk [Line Items]              
Funds withheld for reinsurance receivables, at fair value     $ 684,000,000   $ 684,000,000    
FSRC [Member]              
Ceded Credit Risk [Line Items]              
Loss upon Recapture of Reinsurance Treaties $ 5,000,000            
Number of Reinsurance Agreements With Unaffiliated Parties     3   3    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income     $ 1,000,000   $ (1,000,000)    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share | $ / shares     $ 0.00   $ 0.00