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Contingencies (Lights/Ultra Lights Cases) (Details) - Subsequent Event [Member] | Apr. 26, 2021 case court claim
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Lights [Member] |
Loss Contingencies [Line Items] |
Claims not certified, number | case | 23
Number of cases pending | 2
Lights [Member] | PM USA [Member] |
Loss Contingencies [Line Items] |
Number of state courts | court | 21
Smoking and Health Class Actions and Aggregated Claims Litigation [Member] |
Loss Contingencies [Line Items] |
Number of cases pending | 1

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- Definition Loss Contingency, Claims Not Certified, Number + References No definition available. + Details
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Namespace Prefix: | mo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Loss Contingency, State Courts, Number + References No definition available. + Details
Name: | mo_LossContingencyStateCourtsNumber
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=121557415&loc=d3e14435-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | dei_LegalEntityAxis=mo_PhilipMorrisUSAMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | srt_LitigationCaseAxis=mo_SmokingAndHealthClassActionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |