Contingencies (Smoking and Health Litigation - Non-Engle Progeny Litigation Narrative) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Apr. 30, 2018	Oct. 31, 2017	Dec. 31, 2015
Loss Contingencies [Line Items]
Provision related to litigation recorded	$ 12,000,000	$ 21,000,000	$ 70,000,000	$ 28,000,000	$ 62,000,000	$ 0	$ 17,000,000	$ 1,000,000
Non-Engle Progeny Smoking and Health Case, Gentile [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded	$ 225,000									$ 7,100,000
Non-Engle Progeny Smoking and Health Case, Gentile [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded										$ 5,300,000
Compensatory damages award, allocation percentage										75.00%
Appeal bond posted									$ 8,000,000
Non-Engle Progeny Smoking and Health Case, Bullock [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded											$ 900,000
Non-Engle Progeny Smoking and Health Case, Bullock [Member] | Philip Morris USA [Member]
Loss Contingencies [Line Items]
Provision related to litigation recorded					$ 1,000,000