Asset Impairment, Exit and Implementation Costs (Pre-tax Asset Impairment, Exit and Implementation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	$ 33	$ 2	$ 73	$ 4
Plus amounts included in net periodic benefit income, excluding service cost, Asset Impairment and Exit Costs			12	0
Total, Asset Impairment and Exit Costs	33	2	85	4
Implementation Costs			21	5
Plus amounts included in net period benefit income, excluding service cost, Implementation Costs			0	0
Total, Implementation Costs	12	4	21	5
Restructuring Charges			94	9
Plus amounts included in net periodic benefit income, excluding service cost, Total			12	0
Total restructuring	45	6	106	9
Operating Segments [Member] | Smokeable Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	14	1	50	1
Implementation Costs	17	1	25	2
Restructuring Charges	31	2	75	3
Operating Segments [Member] | Smokeless Products [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	0	1	8	3
Implementation Costs	2	3	3	3
Restructuring Charges	2	4	11	6
Operating Segments [Member] | All Other [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment and exit costs	19	0	14	0
Implementation Costs	(7)	0	(7)	0
Restructuring Charges	12	0	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	2		$ 2
Marketing Administration And Research Costs [Member]
Restructuring Cost and Reserve [Line Items]
Total, Implementation Costs	$ 14			$ 23