Discontinued Operations (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Revenues from discontinued operations	$ 677,000,000	$ 1,695,000,000	$ 1,873,000,000
Earnings (loss) from discontinued operations, net of tax [Abstract]
Earnings (loss) from discontinued operations	79,000,000	(12,000,000)	128,000,000
Income tax provision, discontinued operations	(26,000,000)	0	(62,000,000)
Earnings (loss) from discontinued operations, net of tax	53,000,000	(12,000,000)	66,000,000
Gain on disposal, net of tax [Abstract]
Gain on disposal	1,557,000,000	159,000,000	0
Income tax provision on disposal	0	(6,000,000)	0
Gain on disposal, net of tax	1,557,000,000	153,000,000	0
Net earnings from discontinued operations attributable to noncontrolling interest, net of tax	5,000,000	0	0
Net earnings (loss) from discontinued operations, net of tax	1,605,000,000	141,000,000	66,000,000
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Current assets, discontinued operations	0	351,000,000
Goodwill, discontinued operations	0	1,866,000,000
Intangible assets, discontinued operations	0	366,000,000
Net property and equipment, discontinued operations	0	763,000,000
Other assets, discontinued operations	39,000,000	129,000,000
Total assets, discontinued operations	39,000,000	3,475,000,000
Current liabilities, discontinued operations	26,000,000	254,000,000
Noncurrent liabilities, discontinued operations	118,000,000	477,000,000
Total liabilities, discontinued operations	$ 144,000,000	$ 731,000,000