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Separation Separation - Agreements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2017
Oct. 02, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]          
Income Taxes Receivable   $ 3 $ 3   $ 20
Other Assets   8,149 8,149   $ 7,058
Impact of Separation [Member]          
Related Party Transaction [Line Items]          
Decrease to current income tax recoverable   1,093      
Brighthouse Financial, Inc | Impact of Separation [Member]          
Related Party Transaction [Line Items]          
Income Taxes Receivable   1,400 1,400    
Related Party Transaction, Due from (to) Related Party   1,400 1,400    
Subsequent Event [Member] | Brighthouse Financial, Inc | Impact of Separation [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Payment to affiliate       $ 729  
Impact of Separation [Member]          
Related Party Transaction [Line Items]          
Other Assets   555 555    
Brighthouse Financial, Inc | Impact of Separation [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Due from (to) Related Party   (40) (40)    
Realized Investment Gains (Losses) $ (555)        
Impact of Separation [Member]          
Related Party Transaction [Line Items]          
Discontinued Operation, Tax separation agreement Expense   1,093      
Realized Investment Gains (Losses)   $ (738) $ (738)