Dispositions (Income Statement Data) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]
Disposals of discontinued operations	$ 0	$ (6)	$ 0	$ (5)
Income tax expense (credit)	2	(1)	3	(12)
Disposals of discontinued operations, net of tax	(2)	(5)	(3)	7
Discontinued operations, net of tax	$ (2)	$ (5)	$ (3)	$ 7
Discontinued operations, net of tax per share
- Basic (in dollars per share)	$ (0.01)	$ 0.00	$ (0.01)	$ 0.01
- Diluted (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)	$ 0.02