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Insurance (Fund Groupings) (Details) (Variable Annuity and Variable Life [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fund Groupings    
Fund Groupings $ 52,465us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue $ 52,126us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
Equity Funds [Member]    
Fund Groupings    
Fund Groupings 24,995us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquityFundsMember		 24,915us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_EquityFundsMember
Balanced Funds [Member]    
Fund Groupings    
Fund Groupings 22,759us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= mlic_BalancedFundsMember		 22,481us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= mlic_BalancedFundsMember
Bond Funds [Member]    
Fund Groupings    
Fund Groupings 4,561us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= mlic_BondFundsMember		 4,551us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= mlic_BondFundsMember
Money Market Funds [Member]    
Fund Groupings    
Fund Groupings $ 150us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_MoneyMarketFundsMember		 $ 179us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentFairValue
/ us-gaap_ProductOrServiceAxis
= mlic_VariableAnnuityAndVariableLifeMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_MoneyMarketFundsMember