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INVESTMENTS (NET UNREALIZED INVESTMENTS (DETAILS) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Net unrealized gains (losses) arising during the year $ 11us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax $ (58)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax $ 28us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 7mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome (44)mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome 3mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
Net Unrealized Gains Losses On Investmetns [Member] | Unrealized Investment Gains Losses With Otti Losses [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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2us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Net unrealized gains (losses) arising during the year 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
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Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 3mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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(1)mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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Net Unrealized Gains Losses On Investmetns [Member] | Unrealized Investment Gains Losses All Other [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year 5us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Net unrealized gains (losses) arising during the year 17us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
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Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 7mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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(67)mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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Balance, End of Year 29us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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DAC and VOBA [Member} | Unrealized Investment Gains Losses With Otti Losses [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year (1)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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DAC and VOBA [Member} | Unrealized Investment Gains Losses All Other [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year 12us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Deferred Policy Acquisition Cost Amortization Expense Unrealized Investment Gains Losses 14us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses
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Balance, End of Year (2)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Deferred Income Tax Asset Liability [Member] | Unrealized Investment Gains Losses With Otti Losses [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year 2us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Impact of net unrealized investment gains (losses) on Deferred income taxes 2us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
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Balance, End of Year 0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Deferred Income Tax Asset Liability [Member] | Unrealized Investment Gains Losses All Other [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year (6)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Impact of net unrealized investment gains (losses) on Deferred income taxes 3us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
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Balance, End of Year (9)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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AOCI Gain Losses Related To Net Unrealized Investment Gains Losses [Member] | Unrealized Investment Gains Losses With Otti Losses [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year (3)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Net unrealized gains (losses) arising during the year 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
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Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 3mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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(1)mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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Deferred Policy Acquisition Cost Amortization Expense Unrealized Investment Gains Losses (1)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses
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Impact of net unrealized investment gains (losses) on Deferred income taxes 2us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
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Balance, End of Year (1)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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AOCI Gain Losses Related To Net Unrealized Investment Gains Losses [Member] | Unrealized Investment Gains Losses All Other [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, beginning of year 11us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Net unrealized gains (losses) arising during the year 17us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
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Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax 7mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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(67)mloa_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesAndForWriteDownOfSecuritiesIncludedInNetIncome
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Deferred Policy Acquisition Cost Amortization Expense Unrealized Investment Gains Losses 14us-gaap_DeferredPolicyAcquisitionCostAmortizationExpenseUnrealizedInvestmentGainsLosses
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Impact of net unrealized investment gains (losses) on Deferred income taxes 3us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
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Balance, End of Year 18us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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11us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Fixed Maturities [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, End of Year 28us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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1us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Fixed Maturities [Member] | Unrealized Investment Gains Losses With Otti Losses [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, End of Year (1)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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(4)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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Fixed Maturities [Member] | Unrealized Investment Gains Losses All Other [Member]      
Net Unrealized Investment Gains Losses Recognized In Aoci Roll Forward [Abstract]      
Balance, End of Year $ 29us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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/ mloa_UnrealizedInvestmentGainsLossesWithOttiAndAllOtherAxis
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$ 5us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
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/ mloa_UnrealizedInvestmentGainsLossesWithOttiAndAllOtherAxis
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