Contingencies (Engle Class Action And Engle Progeny Trial Results) (Details)		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 22, 2018 USD ($) case plantiff	Feb. 29, 2008 USD ($)	Jul. 31, 2006 USD ($) plantiff	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2015 USD ($) case	Jul. 31, 2000 USD ($)
Loss Contingencies [Line Items]
Payments made related to litigation | $				$ 21,000,000	$ 0	$ 118,000,000	$ 18,000,000
Engle Progeny Cases [Member]
Loss Contingencies [Line Items]
Punitive damages awarded | $									$ 145,000,000,000
Engle Progeny Cases [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Punitive damages awarded | $									$ 74,000,000,000
Period for decertified class members could file individual actions			1 year
Engle Progeny Cases, Federal [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Payments made related to litigation | $								$ 43,000,000
Number of claims resolved								415
FLORIDA [Member] | Engle Progeny Cases, State [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded | $			$ 6,900,000
Number individual plaintiffs reinstated | plantiff			2
Payments made related to litigation | $		$ 3,000,000
Subsequent Event [Member] | Engle Progeny Cases [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Number of verdicts returned	124
Number of unfavorable verdicts	68
Number of claims with unfavorable verdicts pending/reversed	8
Number of favorable verdicts	44
Subsequent Event [Member] | Engle Progeny Cases, State [Member]
Loss Contingencies [Line Items]
Number of plaintiffs | plantiff	3,000
Number of cases pending	2,200
Subsequent Event [Member] | Engle Progeny Cases, State [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Number of favorable verdicts	37
Subsequent Event [Member] | Engle Progeny Cases, Federal [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Number of cases pending	7
Subsequent Event [Member] | Engle Progeny Cases, D. Cohen, Collar, Chacon and Starbuck [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Number of verdicts reversed	4
Subsequent Event [Member] | Engle Progeny Cases, Reider and Banks [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value | $	$ 0
Subsequent Event [Member] | Engle Progeny Cases, Weingart and Hancock [Member] | PM USA [Member]
Loss Contingencies [Line Items]
Damages awarded, value | $	$ 0