Restructuring and Long-Lived Asset Impairment Charges (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Balance, Total
Balance as of December 31	$ 34
Charges, Total	5
Cash Payments	(12)
Asset impairment	(1)
Balance as of September 30	26
Severance [Member]
Balance, Total
Balance as of December 31	4
Charges, Total	3
Cash Payments	(4)
Asset impairment	0
Balance as of September 30	3
Lease Obligations [Member]
Balance, Total
Balance as of December 31	21
Charges, Total	(1)
Cash Payments	(4)
Asset impairment	0
Balance as of September 30	16
Asset impairments [Member]
Balance, Total
Balance as of December 31	0
Charges, Total	1
Cash Payments	0
Asset impairment	(1)
Balance as of September 30	0
Other exit costs [Member]
Balance, Total
Balance as of December 31	9
Charges, Total	2
Cash Payments	(4)
Asset impairment	0
Balance as of September 30	$ 7