Contingencies Health Care Cost Recovery Litigation (Details) (Health Care Cost Recovery 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	14	11	10
CANADA [Member]
Loss Contingencies [Line Items]
Cases brought against PM	8
Nigeria [Member]
Loss Contingencies [Line Items]
Cases brought against PM	5
Spain [Member]
Loss Contingencies [Line Items]
Cases brought against PM	1