Income Taxes - Schedule of Income Tax Provision (Benefit) Reported in Stockholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Effects Allocated Directly to Equity [Abstract]
Income tax provision (benefit) recorded in AOCI (1)	$ 19	$ 374	$ (978)
Income tax provision (benefit) recorded in additional paid in capital	(7)	16	(10)
Foreign currency translation gains	23	6	5
Total income tax provision (benefit) recorded in stockholders’ equity	$ 35	$ 396	$ (983)