Contingencies (Number of Tobacco Related Cases Pertaining to Combustible Products Pending Against Us and/or Our Subsidiaries or Indemnitees) (Details) - Combustible Products [Member] - litigation_case	Oct. 23, 2020	Oct. 22, 2019	Oct. 23, 2018
Individual Smoking And Health Cases [Member]
Loss Contingencies [Line Items]
Cases brought against PM		49	63
Smoking And Health Class Actions [Member]
Loss Contingencies [Line Items]
Cases brought against PM		10	10
Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Cases brought against PM		17	16
Label Related Class Action [Member]
Loss Contingencies [Line Items]
Cases brought against PM		0	1
Individual Label Related Cases [Member]
Loss Contingencies [Line Items]
Cases brought against PM		5	1
Public Civil Actions [Member]
Loss Contingencies [Line Items]
Cases brought against PM		2	2
Subsequent Event [Member] | Individual Smoking And Health Cases [Member]
Loss Contingencies [Line Items]
Cases brought against PM	43
Subsequent Event [Member] | Smoking And Health Class Actions [Member]
Loss Contingencies [Line Items]
Cases brought against PM	9
Subsequent Event [Member] | Health Care Cost Recovery Actions [Member]
Loss Contingencies [Line Items]
Cases brought against PM	17
Subsequent Event [Member] | Label Related Class Action [Member]
Loss Contingencies [Line Items]
Cases brought against PM	0
Subsequent Event [Member] | Individual Label Related Cases [Member]
Loss Contingencies [Line Items]
Cases brought against PM	5
Subsequent Event [Member] | Public Civil Actions [Member]
Loss Contingencies [Line Items]
Cases brought against PM	2