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Separation of Brighthouse (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 04, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Reduction of long-term debt         $ 944 $ 0  
Non-investment portfolio gains (losses)   $ (76) $ (1,081)   $ (390) (1,091)  
Brighthouse Financial, Inc              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Common Stock, Shares, Owned by MetLife, INC. 22,996,436 0     0    
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal 19.20%            
Equity Method Investment, Quoted Market Value             $ 1,300
Reduction of long-term debt       $ 944      
Non-investment portfolio gains (losses)     1,016     1,016  
FVO Common Stock | Brighthouse Financial, Inc              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Non-investment portfolio gains (losses)     $ 45   $ (327) $ 45