Goodwill and Other Intangible Assets - Amortization Expense Related to Amortizable Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Charged to cost of sales	$ 0	$ 1	$ 1	$ 5
Charged to amortization of intangibles	4	10	13	33
Total amortization	$ 4	$ 11	$ 14	$ 38