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 Interest Rate Swaps	Other
Beginning Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2009	$ (5)	$ 133	$ (92)	$ (46)
Change In Accumulated Other Comprehensive Income
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
Change	18	(16)	18	16
Ending Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2011	(80)	39	(90)	(29)
Change In Accumulated Other Comprehensive Income
Change	106	17	90	(1)
Ending Balance, Accumulated Other Comprehensive Income (Loss) at Dec. 31, 2012	$ 26	$ 56	$ 0	$ (30)