Segment Reporting (Pre-tax Asset Impairment, Exit and Implementation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Asset Impairment and Exit Costs	$ 2	$ 12	$ 4	$ 16
Implementation Costs	4	17	5	40
Total	6	29	9	56
Operating Segments [Member] | Smokeable Products [Member]
Segment Reporting Information [Line Items]
Asset Impairment and Exit Costs	1	1	1	2
Implementation Costs	1	7	2	12
Total	2	8	3	14
Operating Segments [Member] | Smokeless Products [Member]
Segment Reporting Information [Line Items]
Asset Impairment and Exit Costs	1	11	3	14
Implementation Costs	3	10	3	28
Total	$ 4	$ 21	$ 6	$ 42