Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Discontinued Operations Details [Abstract]
Revenues from discontinued operations	$ 123	$ 128
Earnings (loss) from discontinued operations before income taxes	(36)	(28)
Income tax benefit (provision) for discontinued operations	16	(3)
Net loss from discontinued operations, net of tax	(20)	(31)
Noncurrent assets, discontinued operations [Abstract]
Assets of discontinued operations	252		260
Net property and equipment, discontinued operations	102		103
Goodwill, discontinued operations	$ 47		$ 49