Contingencies (Public Civil Actions) (Narrative) (Details) - Public Civil Actions [Member] - litigation_case	Feb. 09, 2018	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Cases brought against PM		2	3
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