Quarterly Financial Data (Unaudited) (EPS attributable to Altria Group, Inc.) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Net revenues	$ 6,304	$ 7,123	$ 6,367	$ 6,359	$ 6,007	$ 6,856	$ 6,619	$ 5,628	$ 26,153	$ 25,110	$ 25,364
Gross profit	3,146	3,717	3,287	2,873	3,084	3,497	3,319	2,811	13,023	12,711	12,254
Net earnings (losses)	1,922	(956)	1,938	1,550	(1,814)	(2,602)	1,997	1,121	4,454	(1,298)	6,967
Net earnings (losses) attributable to Altria	$ 1,924	$ (952)	$ 1,943	$ 1,552	$ (1,809)	$ (2,600)	$ 1,996	$ 1,120	$ 4,467	$ (1,293)	$ 6,963
Basic and diluted earnings (losses) per share attributable to Altria	$ 1.03	$ (0.51)	$ 1.04	$ 0.83
Basic earnings (losses) per share attributable to Altria (in usd per share)					$ (0.97)	$ (1.39)	$ 1.07	$ 0.60	$ 2.40	$ (0.70)	$ 3.69
Diluted earnings (losses) per share attributable to Altria (in usd per share)					$ (1.00)	$ (1.39)	$ 1.07	$ 0.60	$ 2.40	$ (0.70)	$ 3.68