Contingencies: (Number of Tobacco Related Cases Pertaining to Combustible Products Pending Against Us and/or Our Subsidiaries or Indemnitees) (Details) - Combustible Products - litigationCase	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Individual Smoking and Health Cases
Loss Contingencies [Line Items]
Cases brought against Company	40	40	43
Smoking and Health Class Actions
Loss Contingencies [Line Items]
Cases brought against Company	9	9	9
Health Care Cost Recovery Actions
Loss Contingencies [Line Items]
Cases brought against Company	17	17	17
Label-Related Class Actions
Loss Contingencies [Line Items]
Cases brought against Company	0	0	0
Individual Label-Related Cases
Loss Contingencies [Line Items]
Cases brought against Company	6	3	5
Public Civil Actions
Loss Contingencies [Line Items]
Cases brought against Company	1	1	2