| Document and Entity Information | Feb. 12, 2021 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000764180 |
| Document Type | 8-K |
| Document Period End Date | Feb. 12, 2021 |
| Entity Registrant Name | ALTRIA GROUP, INC. |
| Entity Incorporation State Country Code | VA |
| Entity File Number | 1-08940 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock 0.3313 Par Value [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $0.33 1/3 par value |
| Trading Symbol | MO |
| Security Exchange Name | NYSE |
| Common Stock 1.000 Notes Due 2023 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.000% Notes due 2023 |
| Trading Symbol | MO23A |
| Security Exchange Name | NYSE |
| Common Stock 1.700 Notes Due 2025 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.700% Notes due 2025 |
| Trading Symbol | MO25 |
| Security Exchange Name | NYSE |
| Common Stock 2.200 Notes Due 2027 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.200% Notes due 2027 |
| Trading Symbol | MO27 |
| Security Exchange Name | NYSE |
| Common Stock 3.125 Notes Due 2031 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.125% Notes due 2031 |
| Trading Symbol | MO31 |
| Security Exchange Name | NYSE |
