Dispositions (Income Statement Data) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Discontinued Operations and Disposal Groups [Abstract]
Income (loss) from discontinued operations, net of tax		$ 1		$ (1)
Disposals of discontinued operations	0	0	(5)	0
Income tax expense (credit)	1	0	(11)	0
Disposals of discontinued operations, net of tax	(1)	0	6	0
Discontinued operations, net of tax	$ (1)	$ 1	$ 6	$ (1)
Discontinued operations, net of tax
- Basic (in dollars per share)	$ 0.00	$ 0.00	$ 0.01	$ 0.00
- Diluted (in dollars per share)	$ 0.00	$ 0.01	$ 0.01	$ 0.00