Commitments and Contingent Liabilities (Summary of Alleged Injuries in Lawsuit) (Details)
9 Months Ended
Sep. 30, 2016
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PFOA Matters - Kidney Cancer [Member]  
Loss Contingencies [Line Items]  
Number of plaintiffs 200
PFOA Matters - Testicular Cancer [Member]  
Loss Contingencies [Line Items]  
Number of plaintiffs 70
PFOA Matters - Ulcerative Colitis [Member]  
Loss Contingencies [Line Items]  
Number of plaintiffs 300
PFOA Matters - Preeclampsia [Member]  
Loss Contingencies [Line Items]  
Number of plaintiffs 200
PFOA Matters - Thyroid Disease [Member]  
Loss Contingencies [Line Items]  
Number of plaintiffs 1,400
PFOA Matters - High Cholestrol [Member]  
Loss Contingencies [Line Items]  
Number of plaintiffs 1,300