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Benefit Plans (Net Postemployment Costs) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Service cost | $ 1 mo_PostemploymentBenefitsServiceCost | $ 1 mo_PostemploymentBenefitsServiceCost | $ 1 mo_PostemploymentBenefitsServiceCost
Interest cost | 1 mo_PostemploymentBenefitsInterestCost | 1 mo_PostemploymentBenefitsInterestCost | 1 mo_PostemploymentBenefitsInterestCost
Amortization of net loss | 18 mo_PostemploymentBenefitsAmortizationofGainsLosses | 18 mo_PostemploymentBenefitsAmortizationofGainsLosses | 17 mo_PostemploymentBenefitsAmortizationofGainsLosses
Other | 2 mo_PostemploymentBenefitsOtherCost | (17)mo_PostemploymentBenefitsOtherCost | (7)mo_PostemploymentBenefitsOtherCost
Net postemployment costs | $ 22 us-gaap_PostemploymentBenefitsPeriodExpense | $ 3 us-gaap_PostemploymentBenefitsPeriodExpense | $ 12 us-gaap_PostemploymentBenefitsPeriodExpense

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- Definition Postemployment Benefits, Amortization of Gains (Losses) + References No definition available. + Details
Name: | mo_PostemploymentBenefitsAmortizationofGainsLosses
Namespace Prefix: | mo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Postemployment Benefits, Interest Cost + References No definition available. + Details
Name: | mo_PostemploymentBenefitsInterestCost
Namespace Prefix: | mo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Postemployment Benefits, Other Cost + References No definition available. + Details
Name: | mo_PostemploymentBenefitsOtherCost
Namespace Prefix: | mo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Postemployment Benefits, Service Cost + References No definition available. + Details
Name: | mo_PostemploymentBenefitsServiceCost
Namespace Prefix: | mo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period expense related to postemployment benefits. + References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsPeriodExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration