Commitments and Contingent Liabilities (Litigation) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Jul. 31, 2005	Dec. 31, 2004 resident	Mar. 31, 2012	Jan. 31, 2012
PFOA Matters [Member]
Loss Contingencies [Line Items]
Loss contingency accrual, at carrying value			$ 16
PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Binding settlement agreement, class size		80,000
Plaintiffs attorney fees	23
Community health project	70
Health studies cost, estimated			33
Escrow deposit				1
Loss contingency, potential additional loss			$ 235