Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended		3 Months Ended	1 Months Ended
	Mar. 31, 2014 PFOA Matters [Member]	Dec. 31, 2004 PFOA Matters: Drinking Water Actions [Member] resident	Jan. 31, 2012 PFOA Matters: Drinking Water Actions [Member]	Mar. 31, 2014 PFOA Matters: Additional Actions - Ohio MDL [Member]	Mar. 30, 2014 PFOA Matters: Additional Actions - West Virginia [Member]	Jul. 31, 2005 Payment for Plaintiffs Attorney Fees [Member] PFOA Matters: Drinking Water Actions [Member]	Jul. 31, 2005 Payment to fund community health project [Member] PFOA Matters: Drinking Water Actions [Member]	Mar. 31, 2014 Funding for medical monitoring program [Member] PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Accrual balance	$ 15
Binding settlement agreement, class size		80,000
Settlement payments						23	70
Loss contingency, potential additional loss								235
Escrow deposit			$ 1
Lawsuits alleging personal injury				104
New lawsuits filed alleging personal injury				21
Lawsuits alleging wrongful death				6
Lawsuits alleging personal injury that have not been served					900