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INVESTMENTS (Derivatives) (DETAILS) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instrument Detail [Abstract]    
Cash And Securities Collateral For Derivative Contract $ 26mloa_CashAndSecuritiesCollateralForDerivativeContract $ 12mloa_CashAndSecuritiesCollateralForDerivativeContract
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 307invest_DerivativeNotionalAmount 158invest_DerivativeNotionalAmount
Derivative Asset, Fair Value, Net 32us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 20us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Derivative Liability, Fair Value, Net 32us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 20us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Gain (losses) reported in net earnings (losses) 0mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1 (7)mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
Equity Contracts Options [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 307invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
158invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
Derivative Asset, Fair Value, Net 32us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
20us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
Derivative Liability, Fair Value, Net 6us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
6us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
Gain (losses) reported in net earnings (losses) 13mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
8mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_StockOptionMember
GMIB Reinsurance Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Net   0us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= mloa_GmibReinsuranceMember
Gain (losses) reported in net earnings (losses)   (7)mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= mloa_GmibReinsuranceMember
Net Investment Income (Loss) [Member]    
Derivatives, Fair Value [Line Items]    
Gain (losses) reported in net earnings (losses) 13mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InvestmentIncomeMember
8mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InvestmentIncomeMember
MSO and IUL indexed features [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Net 26us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= mloa_NonGmxbEmbeddedDerivativeInsuranceProductsMember
14us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= mloa_NonGmxbEmbeddedDerivativeInsuranceProductsMember
Gain (losses) reported in net earnings (losses) $ (13)mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= mloa_NonGmxbEmbeddedDerivativeInsuranceProductsMember
$ (8)mloa_DerivativeInstumentsGainLossRecognizedInIncomeNet1
/ us-gaap_DerivativeInstrumentRiskAxis
= mloa_NonGmxbEmbeddedDerivativeInsuranceProductsMember