Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ (78)	$ 35	$ (63)	$ 108
Unremitted earnings of foreign subsidiaries	$ 1,300		$ 1,300