Income Taxes - Unrecognized Tax Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits increases	$ 73
Unrecognized tax benefits that would impact effective tax rate	372
Interest and penalties, net of tax benefits, in uncertain tax positions	2
Unrecognized tax benefits, interest and penalties accrued	61	$ 55
Unrecognized tax balance	440	$ 367	$ 304	$ 314
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Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	140
Unrecognized tax balance	$ 151