Other Operating Expenses, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Income and Expenses [Abstract]
Merger and acquisition costs	$ 19	$ 12	$ 51	$ 29
Special charges, net	1	3	13	10
(Gain) loss on sale of assets, net	(1)	1	5	3
Other operating expenses, net	$ 19	$ 16	$ 69	$ 42