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Benefit Plans (Narrative) (Details) - Pension [Member] $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Additional employer contributions | $ 10
Minimum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated additional employer contributions | 10
Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated additional employer contributions | $ 30

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- Definition Defined Benefit Plan, Additional Contributions by Employer + References No definition available. + Details
Name: | mo_DefinedBenefitPlanAdditionalContributionsbyEmployer
Namespace Prefix: | mo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |