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Segment Information (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Segment Reporting [Abstract]    
Number of segments | Segment 6  
Segment Reporting Information [Line Items]    
Total assets $ 898,764 $ 877,933
Percent of total assets from Japan operations 10.00%  
Brighthouse Financial    
Segment Reporting Information [Line Items]    
Total assets $ 222,681 226,792
Brighthouse Financial | Universal Life    
Segment Reporting Information [Line Items]    
Net amount of other expense charge 296  
Write-off of deferred policy acquisition costs 254  
Increase in insurance-related liabilities 42  
Japan    
Segment Reporting Information [Line Items]    
Total assets $ 98,000 $ 90,000
Assets, Total | Geographic Concentration Risk | Japan    
Segment Reporting Information [Line Items]    
Percent of total assets from Japan operations 11.00% 10.00%