Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2005 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2004 resident	Jan. 31, 2012 USD ($)
PFOA Matters [Member]
Loss Contingencies [Line Items]
Accrual balance		$ 14
PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Binding settlement agreement, class size | resident			80,000
Loss contingency, potential additional loss		$ 235
Escrow deposit				$ 1
PFOA Matters: Additional Actions [Member]
Loss Contingencies [Line Items]
Lawsuits alleging personal injury - Filed		3,500
Lawsuits alleging personal injury, number of new claims filed		50
Lawsuits alleging personal injury, number of claims dismissed		40
Lawsuits alleging wrongful death		37
PFOA MDL plaintiffs		6
Payment for Plaintiffs Attorney Fees [Member] | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Settlement payments	$ 23
Payment to fund community health project [Member] | PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Settlement payments	$ 70