Cover Page Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 15, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K/A
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Annual Report	true
Document Transition Report	false
Entity File Number	1-08940
Entity Registrant Name	ALTRIA GROUP, INC.
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	13-3260245
Entity Address, Address Line One	6601 West Broad Street,
Entity Address, City or Town	Richmond,
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	23230
City Area Code	804
Local Phone Number	274-2200
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 73
Entity Common Stock, Shares Outstanding		1,858,689,654
Amendment Description	This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment”) of Altria Group, Inc. (“Altria”) amends Altria’s Annual Report on Form 10-K for the year ended December 31, 2020, which Altria filed with the Securities and Exchange Commission (“SEC”) on February 26, 2021 (the “Original Form 10-K”). Altria is filing this Amendment to amend Item 15 to include the consolidated financial statements of its foreign equity investee, Anheuser-Busch InBev SA/NV (“ABI”) as of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018 (the “ABI Financial Statements”) in accordance with Rule 3-09 of SEC Regulation S-X. The ABI Financial Statements, which were prepared by ABI, were audited in accordance with the standards of the Public Company Accounting Oversight Board (United States).
Amendment Flag	true
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000764180
ICFR Auditor Attestation Flag	true
Common Stock, 1.000% Notes Due 2023 [Member]
Entity Information [Line Items]
Title of 12(b) Security	1.000% Notes due 2023
Trading Symbol	MO23A
Security Exchange Name	NYSE
Common Stock, 0.33 1/3 Par Value [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.33  1/3 par value
Trading Symbol	MO
Security Exchange Name	NYSE
Common Stock, 3.125% Notes Due 2031 [Member]
Entity Information [Line Items]
Title of 12(b) Security	3.125% Notes due 2031
Trading Symbol	MO31
Security Exchange Name	NYSE
Common Stock, 2.200% Notes Due 2027 [Member]
Entity Information [Line Items]
Title of 12(b) Security	2.200% Notes due 2027
Trading Symbol	MO27
Security Exchange Name	NYSE
Common Stock, 1.700% Notes Due 2025 [Member]
Entity Information [Line Items]
Title of 12(b) Security	1.700% Notes due 2025
Trading Symbol	MO25
Security Exchange Name	NYSE