Segment Reporting (Segment Data Schedule) (Details) - USD ($) $ 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
Segment Reporting Information [Line Items]
Net revenues	$ 6,304	$ 7,123	$ 6,367	$ 6,359	$ 6,007	$ 6,856	$ 6,619	$ 5,628	$ 26,153	$ 25,110	$ 25,364
Operating income									10,873	10,326	9,115
Amortization of intangibles									(72)	(44)	(38)
Corporate asset impairment and exit costs									4	(188)	(386)
Interest and other debt expense, net									(1,209)	(1,280)	(665)
Net periodic benefit income, excluding service cost									77	37	34
(Income) losses from equity investments									(111)	1,725	890
Impairment of JUUL equity securities	$ 0	$ (2,600)	$ 0	$ 0	$ (4,100)	$ (4,500)	$ 0	$ 0	(2,600)	(8,600)	0
Loss on Cronos-related financial instruments									(140)	(1,442)	0
Loss on ABI/SABMiller business combination									0	0	(33)
Earnings before income taxes									6,890	766	9,341
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
General corporate expenses									(227)	(199)	(315)
Corporate asset impairment and exit costs									1	(1)	0
Smokeable Products [Member]
Segment Reporting Information [Line Items]
Net revenues									23,089	21,996	22,297
Smokeable Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income									9,985	9,009	8,408
Oral Tobacco Products [Member]
Segment Reporting Information [Line Items]
Net revenues									2,533	2,367	2,262
Oral Tobacco Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income									1,718	1,580	1,431
Wine [Member]
Segment Reporting Information [Line Items]
Net revenues									614	689	691
Wine [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income									(360)	(3)	50
All Other [Member]
Segment Reporting Information [Line Items]
Net revenues									(83)	58	114
All Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income									$ (172)	$ (16)	$ (421)