Acquisitions and Divestitures (Key components of income from discontinued operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of income from discontinued operations
Revenue		$ 40		$ 124
Expenses		37		100
Operating income		3		24
Provision for taxes on income		1		9
Income from discontinued operations, net of tax	$ 0	$ 2	$ 0	$ 15