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Contingencies (Other Disputes Under the State Settlement Agreements) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
RJR-Lorillard-ITG Transaction Case [Member] |
Loss Contingencies [Line Items] |
Payments for legal settlements, incorrect increase | $ 146

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- Definition Payments for Legal Settlements, Incorrect Increase + References No definition available. + Details
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Namespace Prefix: | mo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LitigationCaseAxis=mo_RJRLorillardITGTransactionCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |