Contingencies: (Tobacco-Related Litigation) (Details)							1 Months Ended		3 Months Ended
	Mar. 01, 2019 CAD ($)	Mar. 01, 2019 USD ($)	May 27, 2015 CAD ($) plaintiff manufacturer	May 27, 2015 USD ($) plaintiff manufacturer	Jun. 20, 2012 cigarette	Jul. 10, 2009 cigarette	Oct. 30, 2015 CAD ($)	Oct. 30, 2015 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2022 litigationCase
Loss Contingencies [Line Items]
Number of cases decided in favor of PM										528
Number of cases decided in favor of plaintiff										14
Cases Remaining On Appeal
Loss Contingencies [Line Items]
Number of cases on appeal										4
Case Decided In Favor Of Plaintiff
Loss Contingencies [Line Items]
Number of cases that reached final resolution in favor of PM										10
Canada | Conseil Quebecois Sur Le Tabac Et La Sante and Jean-Yves Blais | Smoking and Health Class Actions
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 | Conseil Quebecois Sur Le Tabac Et La Sante and Jean-Yves Blais | Judicial Ruling | Imperial Tobacco Ltd., Rothmans, Benson And Hedges Inc., And JTI Macdonald Corp. | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Compensatory damages awarded			$ 15,500,000,000	$ 11,500,000,000
Punitive damages awarded			90,000	67,000
Damages awarded, reduced amount	$ 13,500,000,000	$ 10,100,000,000
Canada | Conseil Quebecois Sur Le Tabac Et La Sante and Jean-Yves Blais | Judicial Ruling | RBH | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Compensatory damages awarded	$ 2,700,000,000	$ 2,000,000,000	$ 3,100,000,000	$ 2,300,000,000
Damages allocated to subsidiary (percent)	20.00%	20.00%	20.00%	20.00%
Punitive damages awarded			$ 30,000	$ 22,000
Canada | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases | Judicial Ruling | Imperial Tobacco Ltd., Rothmans, Benson And Hedges Inc., And JTI Macdonald Corp. | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Damages awarded that are to be deposited into trust	$ 1,100,000,000	$ 819,000,000
Payment period for amount to be deposited into trust	60 days	60 days
Canada | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases | Appellate Ruling | RBH | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Amount of security ordered to be furnished and paid							$ 226,000,000	$ 168,000,000
Amount of security ordered, funded by defendant	$ 257,000,000	$ 194,000,000
Amount of litigation charge | $									$ 194,000,000
Amount of litigation charge net of tax | $									$ 142,000,000
Canada | Cecilia Letourneau & Conseil Quebecois Sur La Tabac Et La Sante and Jean-Yves Blais Cases | Appellate Ruling | Imperial Tobacco Ltd. | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Motion for security ordered by appeals court							$ 758,000,000	$ 564,000,000
Canada | Cecilia Letourneau | Smoking and Health Class Actions
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 | Cecilia Letourneau | Judicial Ruling | Imperial Tobacco Ltd., Rothmans, Benson And Hedges Inc., And JTI Macdonald Corp. | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Punitive damages awarded			$ 131,000,000	$ 98,000,000
Canada | Cecilia Letourneau | Judicial Ruling | RBH | Smoking and Health Class Actions
Loss Contingencies [Line Items]
Punitive damages awarded			$ 46,000,000	$ 34,300,000
Punitive damages awarded including interest	$ 57,000,000	$ 42,000,000
Canada | Adams | Pending Litigation
Loss Contingencies [Line Items]
Plaintiff requirement, minimum number of cigarettes smoked | cigarette						25,000
Canada | Suzanne Jacklin | Pending Litigation
Loss Contingencies [Line Items]
Plaintiff requirement, minimum number of cigarettes smoked | cigarette					25,000