Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2016 USD ($)
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	$ 22
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	74
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	$ 135