Goodwill and Other Intangible Assets - Amortization Expense Related to Amortizable Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Charged to cost of sales	$ 0	$ 2	$ 1	$ 4
Charged to amortization of intangibles	4	10	9	23
Total amortization	$ 4	$ 12	$ 10	$ 27