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Contingencies (Lights Cases) (Narrative) (Details) - Individual Lights Cases [Member] - litigation_case
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]      
Cases brought against PM 3 3 2
Chile [Member]      
Loss Contingencies [Line Items]      
Cases brought against PM 2    
Italy [Member]      
Loss Contingencies [Line Items]      
Cases brought against PM 1