Environmental (Schedule of Environmental Expenditures) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Environmental Remediation Obligations [Abstract]
Capital expenditures	$ 30		$ 19		$ 22
Other expenditures	41	[1]	47	[1]	56	[1]
Total	71		66		78
Expenditures for Superfund	$ 2		$ 2		$ 1

[1] Includes expenditures for US Superfund sites of $2 million, $2 million and $1 million for the years ended December 31, 2011, 2010 and 2009, respectively.