Asset Impairment, Exit and Implementation Costs (Pre-tax Asset Impairment, Exit and Implementation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	$ 1	$ (2)	$ 74	$ 2
Plus amounts included in net periodic benefit income, excluding service cost, Asset Impairment and Exit Costs			12	0
Total, Asset Impairment and Exit Costs	1	(2)	86	2
Implementation Costs			25	4
Plus amounts included in net period benefit income, excluding service cost, Implementation Costs			0	0
Total, Implementation Costs	(4)	1	(25)	(4)
Restructuring Charges			99	6
Plus amounts included in net periodic benefit income, excluding service cost, Total			12	0
Total restructuring	5	(3)	111	6
Operating Segments [Member] | Smokeable Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	0	(5)	50	(4)
Implementation Costs	4	(1)	29	1
Restructuring Charges	4	(6)	79	(3)
Operating Segments [Member] | Smokeless Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	1	3	9	6
Implementation Costs	0	0	3	3
Restructuring Charges	1	3	12	9
Operating Segments [Member] | All Other [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs			14	0
Implementation Costs			(7)	0
Restructuring Charges			7	0
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	0	$ 0	1	0
Implementation Costs			0	0
Restructuring Charges			1	$ 0
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Total, Implementation Costs	1		1
Marketing Administration And Research Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total, Implementation Costs	$ (3)		$ (26)