Commitments and Contingent Liabilities (Details) (Asbestos Related Product Liability [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Asbestos Related Product Liability [Member]
Number of claims filed
Pending claims, beginning of period	$ 78,500		$ 83,700
New claims filed	500		2,200
Claims settled/dismissed	(3,000)		(7,400)
Pending claims, end of period	76,000		78,500
Payments	$ 3	[1]	$ 23	[1]

[1] Represents amount spent by us and our insurers on asbestos litigation defense and claim resolution