Segment Reporting (Schedule of Pre-tax Tobacco and Health Litigation Items) (Details) - Non-Participating Manufacturer Arbitration Panel Decision [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement	$ (68)	$ (1)
PM USA [Member] | Interest And Other Debt Expense, Net [Member]
Segment Reporting Information [Line Items]
Interest and other debt expense, net	0	7
NPM Adjustment to Cost Of Sales [Member] | PM USA [Member] | Smokeable Products [Member] | Cost of Sales [Member]
Segment Reporting Information [Line Items]
Gain (Loss) Related to Litigation Settlement	$ (68)	$ (8)