Contingencies (Public Civil Actions) (Details) - Combustible Products [Member] - Public Civil Actions [Member] - litigation_case	Jul. 23, 2019	Jul. 24, 2018	Jul. 25, 2017
Loss Contingencies [Line Items]
Cases brought against PM		2	2
Subsequent Event [Member]
Loss Contingencies [Line Items]
Cases brought against PM	2
Subsequent Event [Member] | Argentina [Member]
Loss Contingencies [Line Items]
Cases brought against PM	1
Subsequent Event [Member] | Venezuela [Member]
Loss Contingencies [Line Items]
Cases brought against PM	1