Income Taxes - Schedule for Income Before Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic	$ 6,368	$ 2,802	$ 4,918
Foreign	6,150	3,392	(8)
Income before provision for income taxes	$ 12,518	$ 6,194	$ 4,910