Supplementary Stockholders' Equity Information Accumulated Other Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	Total	Net Foreign Currency Translation Adjustment	Unrealized Holding Gain (Loss) on Investment and Interest Rate Swap	Other
Beginning Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2008	$ (51)	$ 97	$ (97)	$ (51)
Change In Accumulated Other Comprehensive Income [Roll Forward]
Change	46	36	5	5
Ending Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2009	(5)	133	(92)	(46)
Change In Accumulated Other Comprehensive Income [Roll Forward]
Change	(93)	(78)	(16)	1
Ending Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2010	(98)	55	(108)	(45)
Change In Accumulated Other Comprehensive Income [Roll Forward]
Change	18	(16)	18	16
Ending Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2011	$ (80)	$ 39	$ (90)	$ (29)