Dispositions (Income Statement Data) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]
Disposals of discontinued operations	$ (1)	$ 0	$ (1)	$ (5)
Income tax expense (credit)	0	1	3	(11)
Disposals of discontinued operations, net of tax	(1)	(1)	(4)	6
Discontinued operations, net of tax	$ (1)	$ (1)	$ (4)	$ 6
Discontinued operations, net of tax per share
- Basic (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.01
- Diluted (in dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ 0.01