Contingencies Public Civil Actions (Details) (Public Civil Actions [Member])	Aug. 01, 2012 Litigation_Cases	Aug. 01, 2011 Litigation_Cases	Aug. 01, 2010 Litigation_Cases
Loss Contingencies [Line Items]
Cases brought against PM	3	4	9
ARGENTINA [Member]
Loss Contingencies [Line Items]
Cases brought against PM	1
BRAZIL [Member]
Loss Contingencies [Line Items]
Cases brought against PM	1
VENEZUELA [Member]
Loss Contingencies [Line Items]
Cases brought against PM	1