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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Net revenues	$ 6,007	$ 6,856	$ 6,619	$ 5,628	$ 6,114	$ 6,837	$ 6,305	$ 6,108	$ 25,110	$ 25,364	$ 25,576
Gross profit	3,084	3,497	3,319	2,811	2,922	3,255	3,141	2,936	12,711	12,254	11,963
Net earnings (losses)	(1,814)	(2,602)	1,997	1,121	1,251	1,944	1,877	1,895	(1,298)	6,967	10,227
Net earnings (losses) attributable to Altria	$ (1,809)	$ (2,600)	$ 1,996	$ 1,120	$ 1,250	$ 1,943	$ 1,876	$ 1,894	$ (1,293)	$ 6,963	$ 10,222
Basic earnings (losses) per share attributable to Altria (in usd per share)	$ (0.97)	$ (1.39)	$ 1.07	$ 0.60	$ 0.67	$ 1.03	$ 0.99	$ 1.00	$ (0.70)	$ 3.69	$ 5.31
Diluted earnings (losses) per share attributable to Altria (in usd per share)	$ (1.00)	$ (1.39)	$ 1.07	$ 0.60	$ 0.66	$ 1.03	$ 0.99	$ 1.00	$ (0.70)	$ 3.68	$ 5.31