Restructuring and Long-Lived Asset Impairment Charges (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve [Roll Forward]
Balance as of January 1	$ 34	$ 49	$ 40
Charges, Total	18	75	110
Cash Payments	(24)	(35)	(37)
Asset impairment	(8)	(55)	(64)
Balance as of December 31	20	34	49
Severance [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1	4	11	4
Charges, Total	6	7	22
Cash Payments	(5)	(14)	(15)
Asset impairment	0	0	0
Balance as of December 31	5	4	11
Lease Obligations [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1	21	29	34
Charges, Total	0	4	11
Cash Payments	(6)	(12)	(16)
Asset impairment	0	0	0
Balance as of December 31	15	21	29
Asset impairments [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1	0	0	0
Charges, Total	8	55	64
Cash Payments	0	0	0
Asset impairment	(8)	(55)	(64)
Balance as of December 31	0	0	0
Other exit costs [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1	9	9	2
Charges, Total	4	9	13
Cash Payments	(13)	(9)	(6)
Asset impairment	0	0	0
Balance as of December 31	$ 0	$ 9	$ 9