Commitments and Contingent Liabilities (Loss Contingencies) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2011	Dec. 31, 2005	Dec. 31, 2004	Jan. 31, 2012	Dec. 31, 2011
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
Settlement Payment	$ 8.3