Contingencies (Non-Engle Progeny Litigation) (Details) - USD ($)	May 31, 2020	Feb. 29, 2020	Sep. 30, 2019	Aug. 31, 2019	Oct. 31, 2017
Non-Engle Progeny Smoking And Health Case, Principe [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded		$ 11,000,000
Punitive damages awarded		$ 0
Non-Engle Progeny Smoking and Health Case, Greene [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded	$ 30,000,000		$ 10,000,000
Non-Engle Progeny Smoking and Health Case, Laramie [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded				$ 11,000,000
Punitive damages awarded				$ 10,000,000
Non-Engle Progeny Smoking and Health Case, Gentile [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded					$ 7,100,000
Non-Engle Progeny Smoking and Health Case, Gentile [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded					$ 5,300,000
Compensatory damages award, allocation percentage					75.00%