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Separation of Brighthouse (Service Agreements and Other) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Discontinued Operation after Disposal, Revenue $ 32   $ 61    
Other Policy-Related Balances 15,908   15,908   $ 15,515
Insurance Commissions and Fees 1,370 $ 1,364 2,762 $ 2,724  
Brighthouse Financial, Inc          
Related Party Transaction [Line Items]          
Discontinued Operation after Disposal, Revenue 78   157    
Revenue from Related Parties   83   164  
Other Policy-Related Balances 1,300   1,300   1,300
Insurance Commissions and Fees 31 $ 31 63 $ 62  
Employee matters agreement, impact of Separation 179   179   186
Related Party Transaction, Due from (to) Related Party $ 111   $ 111   $ 97