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Reinsurance (Effects of Reinsurance on Earnings) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Premiums:      
Direct premiums $ 20,963us-gaap_DirectPremiumsEarned $ 20,290us-gaap_DirectPremiumsEarned $ 19,821us-gaap_DirectPremiumsEarned
Reinsurance assumed 1,673us-gaap_AssumedPremiumsEarned 1,469us-gaap_AssumedPremiumsEarned 1,350us-gaap_AssumedPremiumsEarned
Reinsurance ceded (1,252)us-gaap_CededPremiumsEarned (1,284)us-gaap_CededPremiumsEarned (1,291)us-gaap_CededPremiumsEarned
Net premiums 21,384us-gaap_PremiumsEarnedNet 20,475us-gaap_PremiumsEarnedNet 19,880us-gaap_PremiumsEarnedNet
Universal life and investment-type product policy fees:      
Direct universal life and investment-type product policy fees 3,029mlic_DirectInsuranceCommissionsAndFees 2,913mlic_DirectInsuranceCommissionsAndFees 2,763mlic_DirectInsuranceCommissionsAndFees
Reinsurance assumed 48mlic_AssumedInsuranceCommissionsAndFees 41mlic_AssumedInsuranceCommissionsAndFees 39mlic_AssumedInsuranceCommissionsAndFees
Reinsurance ceded (611)mlic_CededInsuranceCommissionsAndFees (591)mlic_CededInsuranceCommissionsAndFees (563)mlic_CededInsuranceCommissionsAndFees
Net universal life and investment-type product policy fees 2,466us-gaap_InsuranceCommissionsAndFees 2,363us-gaap_InsuranceCommissionsAndFees 2,239us-gaap_InsuranceCommissionsAndFees
Other revenues:      
Direct other revenues 1,040mlic_OtherIncomeDirect 970mlic_OtherIncomeDirect 887mlic_OtherIncomeDirect
Reinsurance assumed 2mlic_CommissionsFeesAndOtherIncomeAssumed (2)mlic_CommissionsFeesAndOtherIncomeAssumed (6)mlic_CommissionsFeesAndOtherIncomeAssumed
Reinsurance ceded 766mlic_OtherIncomeCeded 731mlic_OtherIncomeCeded 849mlic_OtherIncomeCeded
Net other revenues 1,808us-gaap_OtherIncome 1,699us-gaap_OtherIncome 1,730us-gaap_OtherIncome
Policyholder benefits and claims:      
Direct policyholder benefits and claims 23,978us-gaap_PolicyholderBenefitsAndClaimsIncurredGross 23,305us-gaap_PolicyholderBenefitsAndClaimsIncurredGross 22,677us-gaap_PolicyholderBenefitsAndClaimsIncurredGross
Reinsurance assumed 1,416us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed 1,225us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed 1,208us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed
Reinsurance ceded (1,539)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded (1,498)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded (1,616)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Net policyholder benefits and claims 23,855us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 23,032us-gaap_PolicyholderBenefitsAndClaimsIncurredNet 22,269us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Interest credited to policyholder account balances:      
Direct interest credited to policyholder account balances 2,227mlic_DirectInterestCreditedToPolicyholdersAccountBalances 2,322mlic_DirectInterestCreditedToPolicyholdersAccountBalances 2,455mlic_DirectInterestCreditedToPolicyholdersAccountBalances
Reinsurance assumed 35mlic_AssumedInterestCreditedToPolicyholdersAccountBalances 35mlic_AssumedInterestCreditedToPolicyholdersAccountBalances 33mlic_AssumedInterestCreditedToPolicyholdersAccountBalances
Reinsurance ceded (88)mlic_CededInterestCreditedToPolicyholdersAccountBalances (104)mlic_CededInterestCreditedToPolicyholdersAccountBalances (98)mlic_CededInterestCreditedToPolicyholdersAccountBalances
Net interest credited to policyholder account balances 2,174us-gaap_InterestCreditedToPolicyholdersAccountBalances 2,253us-gaap_InterestCreditedToPolicyholdersAccountBalances 2,390us-gaap_InterestCreditedToPolicyholdersAccountBalances
Other expenses:      
Direct other expenses 5,132mlic_DirectOperatingExpenses 5,028mlic_DirectOperatingExpenses 5,328mlic_DirectOperatingExpenses
Reinsurance assumed 399mlic_AssumedOperatingExpenses 427mlic_AssumedOperatingExpenses 479mlic_AssumedOperatingExpenses
Reinsurance ceded 540mlic_CededOperatingExpenses 533mlic_CededOperatingExpenses 587mlic_CededOperatingExpenses
Total other expenses $ 6,071us-gaap_OperatingExpenses $ 5,988us-gaap_OperatingExpenses $ 6,394us-gaap_OperatingExpenses