Acquisitions and Divestitures (Key components of income from discontinued operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of income from discontinued operations
Revenue		$ 44		$ 84
Expenses		34		63
Operating income		10		21
Provision for taxes on income		4		9
Income from discontinued operations, net of tax	$ 0	$ 6	$ 0	$ 12