Earnings per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net earnings attributable to Altria	$ 1,424	$ 1,552
Less: Distributed and undistributed earnings attributable to share-based awards	(3)	(2)
Earnings for basic EPS	1,421	1,550
Earnings for diluted EPS	$ 1,421	$ 1,550
Weighted-average shares for basic EPS (in shares)	1,857	1,858
Weighted-average shares for diluted EPS (in shares)	1,857	1,858