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Contingencies (General Information) (Details)	Mar. 31, 2021 state
Commitments and Contingencies Disclosure [Abstract]
Number of states that cap bond or require no bond	47

X

- Definition

Loss Contingency, Number of States That Cap Bond or Require No Bond

+ 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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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration