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INVESTMENTS (AVAILABLE FOR SALE SECURITIES) (DETAILS) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Fair Value $ 878us-gaap_AvailableForSaleSecurities $ 713us-gaap_AvailableForSaleSecurities  
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]      
Due in one year or less, Amortized Cost 39us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost    
Due in years two through five, Amortized Cost 167us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost    
Due in years six through ten, Amortized Cost 560us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost    
Due after ten years, Amortized Cost 32us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Subtotal 798us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis    
Debt Maturities, Amortized Cost Basis 832us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]      
Due in one year or less, Fair Value 40us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Due in years two through five, Fair Value 179us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Due in years six through ten, Fair Value 582us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
Due after ten years, Fair Value 33us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Subtotal 834us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate    
Available For Sale Securities, Debt Maturities, Fair Value 860mloa_AvailableForSaleSecuritiesDebtMaturitiesFairValue1    
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]      
Proceeds from sales 39us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 1,200us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 13us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross gains on sales 1mloa_AvailableForSaleSecuritiesGrossRealizedGainsCostBasisMethodologyOfSecuritiesSold 84mloa_AvailableForSaleSecuritiesGrossRealizedGainsCostBasisMethodologyOfSecuritiesSold 2mloa_AvailableForSaleSecuritiesGrossRealizedGainsCostBasisMethodologyOfSecuritiesSold
Gross losses on sales 1mloa_AvailableForSaleSecuritiesGrossRealizedLossesCostBasisMethodologyOfSecuritiesSold 9mloa_AvailableForSaleSecuritiesGrossRealizedLossesCostBasisMethodologyOfSecuritiesSold 1mloa_AvailableForSaleSecuritiesGrossRealizedLossesCostBasisMethodologyOfSecuritiesSold
Total other-than-temporary impairment losses (10)us-gaap_ImpairmentOfInvestments (6)us-gaap_ImpairmentOfInvestments (7)us-gaap_ImpairmentOfInvestments
Portion of loss recognized in other comprehensive income (loss) 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest
Credit losses recognized in earnings (loss) (10)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet (6)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet (7)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Fixed Maturities - Credit Loss Impairments      
Balance beginning of period (60)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (72)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld  
Previously recognized impairments on securities that matured, paid, prepaid or sold 19us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold 18us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold  
Recognized impairments on securities impaired to fair value this period 0mloa_IntentToSellOtherThanTemporaryImpairmentLossesInvestments 0mloa_IntentToSellOtherThanTemporaryImpairmentLossesInvestments  
Impairments recognized this period on securities not previously impaired (9)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment (6)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment  
Additional impairments this period on securities previously impaired (1)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses  
Increases due to passage of time on previously recorded credit losses 0mloa_CreditLossImpairmentsIncreasesDueToPassageOfTimeOnPreviouslyRecordedCreditLosses 0mloa_CreditLossImpairmentsIncreasesDueToPassageOfTimeOnPreviouslyRecordedCreditLosses  
Accretion of previously recognized impairments due to increases in expected cash flows 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows 0us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows  
Balances at December 31, (51)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (60)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld (72)us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Protective Life [Member]      
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]      
Proceeds from sales   1,090us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ dei_LegalEntityAxis
= mloa_ProtectiveLifeMember
 
Gross gains on sales   81mloa_AvailableForSaleSecuritiesGrossRealizedGainsCostBasisMethodologyOfSecuritiesSold
/ dei_LegalEntityAxis
= mloa_ProtectiveLifeMember
 
Gross losses on sales   6mloa_AvailableForSaleSecuritiesGrossRealizedLossesCostBasisMethodologyOfSecuritiesSold
/ dei_LegalEntityAxis
= mloa_ProtectiveLifeMember
 
Corporate [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 765us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
608us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Gross Unrealized Gains 38us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
33us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
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= us-gaap_CorporateDebtSecuritiesMember
 
Gross Unrealized Losses 2us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
8us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Fair Value 801us-gaap_AvailableForSaleSecurities
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= us-gaap_CorporateDebtSecuritiesMember
633us-gaap_AvailableForSaleSecurities
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= us-gaap_CorporateDebtSecuritiesMember
 
US Treasury Government And Agency [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 27us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= us-gaap_USTreasuryAndGovernmentMember
34us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= us-gaap_USTreasuryAndGovernmentMember
 
Gross Unrealized Gains   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
Fair Value 27us-gaap_AvailableForSaleSecurities
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= us-gaap_USTreasuryAndGovernmentMember
34us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
 
State and Political Sub-divisions [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 6us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
6us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Gross Unrealized Gains   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Fair Value 6us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
6us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Commercial Mortgage-backed [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 34us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
46us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Gross Unrealized Gains 3us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
1us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
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= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Gross Unrealized Losses 11us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
23us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Fair Value 26us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
24us-gaap_AvailableForSaleSecurities
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= us-gaap_CommercialMortgageBackedSecuritiesMember
 
OTTI in AOCI (3) 1us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
1us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]      
AFS without a single maturity date, amortized cost 34us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
   
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]      
AFS without a single maturity date, Fair Value 26us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
   
Redeemable preferred stock [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 18us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RedeemablePreferredStockMember
18us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= us-gaap_RedeemablePreferredStockMember
 
Gross Unrealized Gains   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RedeemablePreferredStockMember
 
Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RedeemablePreferredStockMember
2us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_RedeemablePreferredStockMember
 
Fair Value 18us-gaap_AvailableForSaleSecurities
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= us-gaap_RedeemablePreferredStockMember
16us-gaap_AvailableForSaleSecurities
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= us-gaap_RedeemablePreferredStockMember
 
Fixed Maturities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 850us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
712us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
 
Gross Unrealized Gains 41us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
34us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
 
Gross Unrealized Losses 13us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
33us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
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= us-gaap_FixedMaturitiesMember
 
Fair Value 878us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
713us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
 
OTTI in AOCI (3) $ 1us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember
$ 1us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedMaturitiesMember