Restructuring and Long-Lived Asset Impairment Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Balance, Total
Balance as of December 31	$ 34
Charges, Total	2
Cash Payments, Total	(5)
Balance as of March 31	31
Severance [Member]
Balance, Total
Balance as of December 31	4
Charges, Total	1
Cash Payments, Total	(3)
Balance as of March 31	2
Lease Obligations [Member]
Balance, Total
Balance as of December 31	21
Charges, Total
Cash Payments, Total	(1)
Balance as of March 31	20
Other exit costs [Member]
Balance, Total
Balance as of December 31	9
Charges, Total	1
Cash Payments, Total	(1)
Balance as of March 31	$ 9