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FAIR VALUE DISCLOSURES (DETAILS 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Financial Instruments [Line Items]    
Available-for-sale Securities, Fair Value Disclosure $ 878us-gaap_AvailableForSaleSecurities $ 713us-gaap_AvailableForSaleSecurities
Public Fixed Maturities [Member]    
Fair Value Financial Instruments [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 661us-gaap_AvailableForSaleSecurities
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PublicFixedMaturitiesMember
556us-gaap_AvailableForSaleSecurities
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PublicFixedMaturitiesMember
Percentage Of Available For Sale Fixed Maturity Assets Measured At Fair Value On Recurring Basis 24.00%mloa_PercentageOfAvailableForSaleFixedMaturityAssetsMeasuredAtFairValueOnRecurringBasis
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PublicFixedMaturitiesMember
20.60%mloa_PercentageOfAvailableForSaleFixedMaturityAssetsMeasuredAtFairValueOnRecurringBasis
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PublicFixedMaturitiesMember
Private Fixed Maturities [Member]    
Fair Value Financial Instruments [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 217us-gaap_AvailableForSaleSecurities
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PrivateFixedMaturitiesMember
157us-gaap_AvailableForSaleSecurities
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PrivateFixedMaturitiesMember
Percentage Of Available For Sale Fixed Maturity Assets Measured At Fair Value On Recurring Basis 7.90%mloa_PercentageOfAvailableForSaleFixedMaturityAssetsMeasuredAtFairValueOnRecurringBasis
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PrivateFixedMaturitiesMember
5.80%mloa_PercentageOfAvailableForSaleFixedMaturityAssetsMeasuredAtFairValueOnRecurringBasis
/ mloa_FixedMaturitiesByTypeAxis
= mloa_PrivateFixedMaturitiesMember
Fair Value Inputs Level 1 [Member]    
Fair Value Financial Instruments [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 10us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
8us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Percentage of Assets Measured at Fair Value on Recurring Basis 67.00%mloa_PercentageOfAssetsMeasuredAtFairValueOnRecurringBasisByInputsLevel
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
72.80%mloa_PercentageOfAssetsMeasuredAtFairValueOnRecurringBasisByInputsLevel
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value Inputs Level 2 [Member]    
Fair Value Financial Instruments [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 834us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
672us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Percentage of Assets Measured at Fair Value on Recurring Basis 31.70%mloa_PercentageOfAssetsMeasuredAtFairValueOnRecurringBasisByInputsLevel
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
26.00%mloa_PercentageOfAssetsMeasuredAtFairValueOnRecurringBasisByInputsLevel
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value Inputs Level 3 [Member]    
Fair Value Financial Instruments [Line Items]    
Available-for-sale Securities, Fair Value Disclosure 34us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
33us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Percentage of Assets Measured at Fair Value on Recurring Basis 1.20%mloa_PercentageOfAssetsMeasuredAtFairValueOnRecurringBasisByInputsLevel
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1.20%mloa_PercentageOfAssetsMeasuredAtFairValueOnRecurringBasisByInputsLevel
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Mortgage- and Asset-backed Securities 26us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
24us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value Disclosures Broker Priced   $ 0mloa_FairValueDisclosuresBrokerPriced
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member