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Contingencies (E-vapor Product Litigation) (Details) - E-vapor Litigation [Member] | Apr. 27, 2020 case claim | Apr. 22, 2019 case | Apr. 23, 2018 case
--- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |
Number of cases pending | case |  | 2 | 3
Subsequent Event [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of cases pending | case | 202 |  |
Number of cases set for trial | claim | 0 |  |
Pending Individual Lawsuits [Member] | Subsequent Event [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Number of cases pending | claim | 170 |  |

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- Definition Loss Contingency, Number of Cases Set for Trial + References No definition available. + Details
Name: | mo_LossContingencyNumberofCasesSetforTrial
Namespace Prefix: | mo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_LitigationCaseAxis=mo_EvaporLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LitigationStatusAxis=mo_PendingIndividualLawsuitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |