Income Taxes (Details 4) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Income Tax Examination [Line Items]
Estimated period of time when the company expects the unrecognized tax benefit balance to decrease	12 months
Minimum
Income Tax Examination [Line Items]
Period of limitation for examination	3 years
Decrease in unrecognized tax benefits that is reasonably possible in the next 12 months	$ 4
Maximum
Income Tax Examination [Line Items]
Period of limitation for examination	5 years
Decrease in unrecognized tax benefits that is reasonably possible in the next 12 months	$ 5