Income Taxes - Schedule for Income Before Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Domestic	$ 2,802	$ 4,918	$ 3,197
Foreign	3,392	(8)	(443)
Income before provision for income taxes	$ 6,194	$ 4,910	$ 2,754