Noncurrent Other Liabilities (Schedule of Changes in Asset Retirement Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Other Liabilities, Noncurrent [Abstract]
Balance at beginning of year	$ 77		$ 67		$ 49
Additions	0	[1]	0	[1]	14	[1]
Accretion	3		3		2
Payments	(10)		(15)		(14)
Revisions to cash flow estimates	(5)	[2]	23	[2]	15	[2]
Exchange rate changes	(1)		(1)		1
Balance at end of year	$ 64		$ 77		$ 67

[1] Primarily relates to sites and impaired long-lived assets (Note 17) which management no longer considers to have an indeterminate life.

[2] Primarily relates to revisions to the estimated cost of future plant closures.