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Benefit Plans (Effects of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates) (Details)
 12 Months Ended
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service and interest cost, One-Percentage-Point Increase 6.30%mo_DefinedBenefitPlanEffectofOnePercentagePointIncreaseonServiceandInterestCostComponentsPercentage
Effect on total of service and interest cost, One-Percentage-Point Decrease (5.40%)mo_DefinedBenefitPlanEffectofOnePercentagePointDecreaseonServiceandInterestCostComponentsPercentage
Postretirement Benefit Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Effect on postretirement benefit obligation, One-Percentage-Point Increase 7.20%mo_DefinedBenefitPlanEffectofOnePercentagePointIncreaseonAccumulatedPostretirementBenefitObligationPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Effect on postretirement benefit obligation, One-Percentage-Point Decrease (6.00%)mo_DefinedBenefitPlanEffectofOnePercentagePointDecreaseonAccumulatedPostretirementBenefitObligationPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember