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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Agricultural Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment $ 11,033us-gaap_LoansReceivableCommercialAgricultural $ 11,025us-gaap_LoansReceivableCommercialAgricultural
% of Total 100.00%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage 100.00%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
Residential Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment 5,494us-gaap_LoansAndLeasesReceivableConsumerMortgage 1,858us-gaap_LoansAndLeasesReceivableConsumerMortgage
% of Total 100.00%mlic_LoansAndLeasesReceivableConsumerMortgagePercentage 100.00%mlic_LoansAndLeasesReceivableConsumerMortgagePercentage
Less than 65%    
Agricultural Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment 10,462us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeOneMember		 10,165us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeOneMember
% of Total 94.80%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeOneMember		 92.20%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeOneMember
65% to 75%    
Agricultural Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment 469us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeTwoMember		 659us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeTwoMember
% of Total 4.20%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeTwoMember		 6.00%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeTwoMember
76% to 80%    
Agricultural Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment 17us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeThreeMember		 84us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeThreeMember
% of Total 0.20%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeThreeMember		 0.80%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeThreeMember
Greater than 80%    
Agricultural Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment 85us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeFourMember		 117us-gaap_LoansReceivableCommercialAgricultural
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeFourMember
% of Total 0.80%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeFourMember		 1.00%mlic_LoansReceivableCommercialAgriculturalMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= mlic_MortgageLoansByCreditQualityIndicatorRangeFourMember
Performing    
Residential Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment 5,345us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 1,812us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
% of Total 97.30%mlic_LoansAndLeasesReceivableConsumerMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 97.50%mlic_LoansAndLeasesReceivableConsumerMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Nonperforming    
Residential Mortgage Loans - by Credit Quality Indicator:    
Recorded Investment $ 149us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 $ 46us-gaap_LoansAndLeasesReceivableConsumerMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
% of Total 2.70%mlic_LoansAndLeasesReceivableConsumerMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 2.50%mlic_LoansAndLeasesReceivableConsumerMortgagePercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember