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Contingencies (Other Disputes Under the State Settlement Agreements) (Details) - USD ($) $ in Millions | 1 Months Ended
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Jan. 31, 2021 | Aug. 31, 2018
PM USA [Member] | Other Disputes Under the State Settlement Agreements [Member] |  |
Loss Contingencies [Line Items] |  |
Amount ordered to be paid from other party | $ 32.0 | $ 9.8

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedFromOtherParty
Namespace Prefix: | us-gaap_
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: | dei_LegalEntityAxis=mo_PhilipMorrisUSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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