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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Equal to or Greater than 12 Months Estimated Fair Value75false 5us-gaap_AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2us-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1000000010USD$falsetruefalse2truefalsefalse2200000022USD$falsetruefalsexbrli:monetaryItemTypemonetaryAmount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.No definition available.false2Equal to or Greater than 12 Months Gross Unrealized LossfalseInvestments (Continuous Gross Unrealized Losses for Fixed Maturity and Equity Securities Available-For-Sale) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.metlife.com/role/InvestmentsContinuousGrossUnrealizedLossesForFixedMaturityAndEquitySecuritiesAvailableForSaleDetails275