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Quarterly Financial Data (Unaudited) (Schedule of Pre-tax Charges or (Gains) Included in Net Earnings Attributable to Altria Group, Inc.) (Details) - USD ($) $ 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
Investments [Line Items]
Impairment of JUUL equity securities	$ 4,100	$ 4,500	$ 0	$ 0					$ 8,600	$ 0	$ 0
NPM Adjustment Items					$ 0	$ 0	$ (77)	$ (68)
Tobacco and health litigation items, including accrued interest	29	3	28	17	12	21	70	28
Asset impairment, exit, implementation and acquisition-related costs	116	11	45	159	532	(3)	6	3
(Gain) loss on ABI/SABMiller business combination					0	0	0	33	$ 0	$ 33	$ (445)
Pre-tax charges (gains) included in net earnings	3,716	5,049	102	715	613	53	(73)	(121)
ABI [Member]
Investments [Line Items]
Investment special items	(364)	(14)	(90)	114	$ 69	$ 35	$ (72)	$ (117)
Cronos [Member]
Investments [Line Items]
Investment special items	$ (165)	$ 549	$ 119	$ 425

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