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Dispositions - Separation of Brighthouse - Service Agreements and Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Revenue $ 48    
Other Policy-Related Balances 15,515 $ 13,402  
Insurance Commissions and Fees 5,510 $ 5,483 $ 5,570
Brighthouse Financial, Inc [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Due from (to) Related Party (1,400)    
Administrative Services [Member] | Brighthouse Financial, Inc [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 73    
Insurance Commissions and Fees $ 54    
Brighthouse Financial, Inc [Member]      
Related Party Transaction [Line Items]      
Discontinued Operation, Period of Continuing Involvement after Disposal 36 months    
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Revenue $ 140    
Revenue from Related Parties 191    
Employee matters agreement, impact of Separation 186    
Other Policy-Related Balances 1,300    
Related Party Transaction, Due from (to) Related Party 97    
Related Party Transaction, Payment to affiliate $ 50