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Derivatives (Estimated Fair Value of Derivative Assets and Liabilities after Master Netting Agreements and Cash Collateral) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals $ 7,247mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals $ 4,277mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 2,774mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals 2,349mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
Amounts offset in the consolidated balance sheet, Assets 0us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement 0us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
Amounts offset in the consolidated balance sheet, Liabilities 0us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement 0us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
Estimated fair value of derivative assets presented in the consolidated balance sheets 7,247us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 4,277us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Estimated fair value of derivative liabilities presented in the consolidated balance sheets 2,774us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 2,349us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Net amount of derivative assets after application of master netting agreements and cash 139us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 24us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Net amount of derivative liabilities after application of master netting agreements and cash 16us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral 66us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Over the Counter [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 6,497mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
4,026mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 2,092mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
2,232mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Gross estimated fair value of derivative assets (1,742)us-gaap_DerivativeAssets
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
(1,844)us-gaap_DerivativeAssets
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Gross estimated fair value of derivative liabilities (1,742)us-gaap_DerivativeLiabilities
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
(1,844)us-gaap_DerivativeLiabilities
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Cash collateral on derivative assets (2,470)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
(1,143)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Cash collateral on derivative liabilities (2)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
(3)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Securities collateral on derivative assets (2,161)mlic_DerivativeAssetCollateralObligationToReturnSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
(1,024)mlic_DerivativeAssetCollateralObligationToReturnSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Securities collateral on derivative liabilities (333)mlic_DerivativeLiabilityCollateralRightToReclaimSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
(319)mlic_DerivativeLiabilityCollateralRightToReclaimSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
Exchange Traded [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 10mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 0mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Gross estimated fair value of derivative assets 0us-gaap_DerivativeAssets
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0us-gaap_DerivativeAssets
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Gross estimated fair value of derivative liabilities 0us-gaap_DerivativeLiabilities
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0us-gaap_DerivativeLiabilities
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Cash collateral on derivative assets 0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Cash collateral on derivative liabilities 0us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Securities collateral on derivative assets 0mlic_DerivativeAssetCollateralObligationToReturnSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0mlic_DerivativeAssetCollateralObligationToReturnSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Securities collateral on derivative liabilities 0mlic_DerivativeLiabilityCollateralRightToReclaimSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
0mlic_DerivativeLiabilityCollateralRightToReclaimSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
Cleared [Member]    
Offsetting Assets [Line Items]    
Derivative Asset, Fair Value, Gross Asset Excluding Accruals 740mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
251mlic_DerivativeAssetFairValueGrossAssetExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Derivative Liability, Fair Value, Gross Liability Excluding Accruals 682mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
117mlic_DerivativeLiabilityFairValueGrossLiabilityExcludingAccruals
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Gross estimated fair value of derivative assets (638)us-gaap_DerivativeAssets
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
(114)us-gaap_DerivativeAssets
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Gross estimated fair value of derivative liabilities (638)us-gaap_DerivativeLiabilities
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
(114)us-gaap_DerivativeLiabilities
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Cash collateral on derivative assets (97)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
(128)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Cash collateral on derivative liabilities (40)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
(3)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Securities collateral on derivative assets 0mlic_DerivativeAssetCollateralObligationToReturnSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
0mlic_DerivativeAssetCollateralObligationToReturnSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Securities collateral on derivative liabilities (3)mlic_DerivativeLiabilityCollateralRightToReclaimSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
0mlic_DerivativeLiabilityCollateralRightToReclaimSecuritiesOffset
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeClearedMember
Off-Balance Sheet [Member] | Over the Counter [Member]    
Offsetting Assets [Line Items]    
Cash collateral on derivative assets $ (138)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= mlic_OffBalanceSheetMember
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember
$ 0us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= mlic_OffBalanceSheetMember
/ us-gaap_TransactionTypeAxis
= mlic_OverCounterMember