Segment Reporting (Schedule of NPM Adjustment Items) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
NPM Adjustment Items [Line Items]
NPM Adjustment Items	$ 0	$ 0	$ (77)	$ (68)
Non-Participating Manufacturer Arbitration Panel Decision [Member]
NPM Adjustment Items [Line Items]
NPM Adjustment Items					$ (145)	$ 4
Operating Income (Loss) [Member] | Smokeable Products [Member] | PM USA [Member] | NPM Adjustment to Cost Of Sales [Member] | Non-Participating Manufacturer Arbitration Panel Decision [Member]
NPM Adjustment Items [Line Items]
NPM Adjustment Items					(145)	(5)
Interest And Other Debt Expense, Net [Member] | PM USA [Member] | Non-Participating Manufacturer Arbitration Panel Decision [Member]
NPM Adjustment Items [Line Items]
Interest and other debt expense, net					$ 0	$ 9