Contingencies (Tobacco-Related Litigation) (Details)							1 Months Ended		3 Months Ended	9 Months Ended
	Mar. 01, 2019 USD ($) litigation_case	Mar. 01, 2019 CAD ($) litigation_case	May 27, 2015 USD ($) plaintiff manufacturer	May 27, 2015 CAD ($) plaintiff manufacturer	Jun. 20, 2012 cigarette	Jul. 10, 2009 cigarette	Oct. 30, 2015 USD ($)	Oct. 30, 2015 CAD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 litigation_case
Loss Contingencies [Line Items]
Number of cases decided in favor of PM											509
Number of cases decided in favor of plaintiff											13
Cases Remaining On Appeal [Member]
Loss Contingencies [Line Items]
Cases on appeal											3
Case Decided In Favor Of Plaintiff [Member]
Loss Contingencies [Line Items]
Number of cases that reached final resolution in favor of PM											10
Canada [Member] | Adams [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Minimum number of cigarettes smoked | cigarette						25,000
Canada [Member] | Suzanne Jacklin [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Minimum number of cigarettes smoked | cigarette					25,000
Canada [Member] | Smoking And Health Class Actions [Member] | Conseil Quebecois Sur Le Tabac Et La Sante and Jean-Yves Blais [Member]
Loss Contingencies [Line Items]
Number of additional manufacturers found liable | manufacturer			2	2
Court-estimated number of members in class | plaintiff			99,957	99,957
Canada [Member] | Smoking And Health Class Actions [Member] | Conseil Quebecois Sur Le Tabac Et La Sante and Jean-Yves Blais [Member] | Judicial Ruling [Member] | Imperial Tobacco Ltd., Rothmans, Benson And Hedges Inc., And JTI Macdonald Corp. [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded			$ 11,800,000,000	$ 15,500,000,000
Punitive damages awarded			68,440	90,000
Damages, reduced amount	$ 10,300,000,000	$ 13,500,000,000
Canada [Member] | Smoking And Health Class Actions [Member] | Conseil Quebecois Sur Le Tabac Et La Sante and Jean-Yves Blais [Member] | Judicial Ruling [Member] | RBH [Member]
Loss Contingencies [Line Items]
Compensatory damages awarded	$ 2,050,000,000.00	$ 2,700,000,000	$ 2,400,000,000	$ 3,100,000,000
Damages allocated to subsidiary (percent)	20.00%	20.00%	20.00%	20.00%
Punitive damages awarded			$ 22,810	$ 30,000
Canada [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member] | Judicial Ruling [Member] | Imperial Tobacco Ltd., Rothmans, Benson And Hedges Inc., And JTI Macdonald Corp. [Member]
Loss Contingencies [Line Items]
Amount to be deposited into trust	$ 836,000,000	$ 1,100,000,000
Payment period	60 days	60 days
Canada [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member] | Appellate Ruling [Member] | RBH [Member]
Loss Contingencies [Line Items]
Motion for security ordered by appeals court, paid by defendant							$ 171,900,000	$ 226,000,000
Amount of security ordered, funded by defendant	$ 194,000,000	$ 257,000,000
Amount of litigation charge | $									$ 194,000,000	$ 194,000,000
Amount of litigation charge net of tax | $									$ 142,000,000
Number of cases decided in favor of plaintiff	2	2
Canada [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases [Member] | Appellate Ruling [Member] | Imperial Tobacco Ltd. [Member]
Loss Contingencies [Line Items]
Motion for security ordered by appeals court							$ 576,000,000	$ 758,000,000
Canada [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau [Member]
Loss Contingencies [Line Items]
Number of additional manufacturers found liable | manufacturer			2	2
Court-estimated number of members in class | plaintiff			918,000	918,000
Canada [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau [Member] | Judicial Ruling [Member] | Imperial Tobacco Ltd., Rothmans, Benson And Hedges Inc., And JTI Macdonald Corp. [Member]
Loss Contingencies [Line Items]
Punitive damages awarded			$ 99,600,000	$ 131,000,000
Canada [Member] | Smoking And Health Class Actions [Member] | Cecilia Letourneau [Member] | Judicial Ruling [Member] | RBH [Member]
Loss Contingencies [Line Items]
Punitive damages awarded			$ 35,000,000	$ 46,000,000
Punitive damages, value	$ 43,400,000	$ 57,000,000