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Separation of Brighthouse (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 04, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net investment gains (losses)   $ (333) $ 88  
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      
Discontinued Operation, Equity Method Investment Retained after Disposal, Ownership Interest after Disposal 19.20%      
Equity Method Investment, Quoted Market Value   1,200   $ 1,300
Net investment gains (losses)   $ (168)    
Discontinued Operation, Separation Costs     $ 77