Contingencies (Public Civil Actions) (Details) - Public Civil Actions [Member] - litigation_case	Oct. 23, 2017	Oct. 21, 2016	Oct. 27, 2015
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