Segment Reporting (Pre-tax Asset Impairment, Exit and Implementation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Asset Impairment and Exit Costs	$ (2)	$ 8	$ 2	$ 24
Implementation Costs	(1)	7	4	47
Total	(3)	15	6	71
Operating Segments [Member] | Smokeable Products [Member]
Segment Reporting Information [Line Items]
Asset Impairment and Exit Costs	(5)	0	(4)	2
Implementation Costs	(1)	5	1	17
Total	(6)	5	(3)	19
Operating Segments [Member] | Smokeless Products [Member]
Segment Reporting Information [Line Items]
Asset Impairment and Exit Costs	3	8	6	22
Implementation Costs	0	2	3	30
Total	$ 3	$ 10	$ 9	$ 52