Contingencies (Health Care Cost Recovery - Federal Government's Lawsuit Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2011	Aug. 31, 2006	Jun. 30, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Loss contingency, amount of district court deposit				$ 21.0	$ 190.0	$ 57.0
Federal Governments Lawsuit [Member]
Loss Contingencies [Line Items]
Federal trade commission, disclosure period		10 years
Federal Governments Lawsuit [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Loss contingency, amount of district court deposit	$ 3.1
Loss contingency installment period, years	5 years
Implementation of Corrective Communications [Member] | Federal Governments Lawsuit [Member]
Loss Contingencies [Line Items]
Provision related to litigation recorded			$ 31.0
Implementation of Corrective Communications [Member] | Federal Governments Lawsuit [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Provision related to litigation recorded			$ 31.0