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Investments (Changes in Fixed Maturity Securities with Noncredit OTTI Losses) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Changes in fixed maturity securities with noncredit OTTI losses in accumulated other comprehensive income (loss)    
Balance at January 1, $ (149)mlic_OtherThanTemporaryImpairmentsOnDebtSecuritiesTransferredToOtherComprehensiveIncomeLoss $ (256)mlic_OtherThanTemporaryImpairmentsOnDebtSecuritiesTransferredToOtherComprehensiveIncomeLoss
Noncredit OTTI losses recognized 10mlic_NoncreditLossesOnDebtSecuritiesIncludedInAccumulatedOtherComprehensiveIncomeLoss 47mlic_NoncreditLossesOnDebtSecuritiesIncludedInAccumulatedOtherComprehensiveIncomeLoss
Securities sold with previous noncredit OTTI loss 41us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 114us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Subsequent changes in estimated fair value 32mlic_ChangeInEstimatedFairValueOfDebtSecuritiesWithNoncreditOttiLossesPreviouslyIncludedInAccumulatedOtherComprehensiveIncomeLoss (54)mlic_ChangeInEstimatedFairValueOfDebtSecuritiesWithNoncreditOttiLossesPreviouslyIncludedInAccumulatedOtherComprehensiveIncomeLoss
Balance at December 31, $ (66)mlic_OtherThanTemporaryImpairmentsOnDebtSecuritiesTransferredToOtherComprehensiveIncomeLoss $ (149)mlic_OtherThanTemporaryImpairmentsOnDebtSecuritiesTransferredToOtherComprehensiveIncomeLoss