Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 5	$ 3
Effective income tax rate	(500.00%)	(5.00%)
Uncertain income tax liabilities	$ 246
Maximum
Income Tax Contingency [Line Items]
Decrease in liability for unrecognized tax benefits reasonably possible	$ 123