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Income Taxes (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Valuation Allowance Rollforward [Roll Forward]
Balance at beginning of year	$ 668
Additions to valuation allowance charged to income tax expense	84
Releases of valuation allowance credited to income tax benefit	(12)
Balance at end of period	$ 740

X

- Definition

Valuation Allowance, Deferred Tax Asset, Additions

+ References

No definition available.

+ Details

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Namespace Prefix:	mo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Valuation Allowance, Deferred Tax Asset, Reductions

+ References

No definition available.

+ Details

Name:	mo_ValuationAllowanceDeferredTaxAssetReductions
Namespace Prefix:	mo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance Rollforward [Roll Forward]

+ References

No definition available.

+ Details

Name:	mo_ValuationAllowanceRollforwardRollForward
Namespace Prefix:	mo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant