Income Taxes (Details 5) $ in Millions	Dec. 31, 2017 USD ($)
U.S. state taxing jurisdictions
Net operating loss (NOL) carryforwards
NOL carryforwards	$ 153
Gross deferred income tax asset associated with NOL carryforwards	12
NOL carryforwards, Valuation allowance	1
U.S. state taxing jurisdictions | Expiration Date 2018
Net operating loss (NOL) carryforwards
NOL carryforwards	6
U.S. state taxing jurisdictions | Expiration Date 2019
Net operating loss (NOL) carryforwards
NOL carryforwards	4
U.S. state taxing jurisdictions | Expiration Date 2020
Net operating loss (NOL) carryforwards
NOL carryforwards	1
U.S. state taxing jurisdictions | Expiration Date 2021
Net operating loss (NOL) carryforwards
NOL carryforwards	5
U.S. state taxing jurisdictions | Expiration Date 2022-2037
Net operating loss (NOL) carryforwards
NOL carryforwards	137
Non-U.S. taxing jurisdictions
Net operating loss (NOL) carryforwards
NOL carryforwards	124
NOL carryforwards, Valuation allowance	10
Non-U.S. taxing jurisdictions | Expiration Date 2018
Net operating loss (NOL) carryforwards
NOL carryforwards	0
Non-U.S. taxing jurisdictions | Expiration Date 2019
Net operating loss (NOL) carryforwards
NOL carryforwards	0
Non-U.S. taxing jurisdictions | Expiration Date 2020
Net operating loss (NOL) carryforwards
NOL carryforwards	0
Non-U.S. taxing jurisdictions | Expiration Date 2021
Net operating loss (NOL) carryforwards
NOL carryforwards	26
Non-U.S. taxing jurisdictions | Expiration Date 2022-2037
Net operating loss (NOL) carryforwards
NOL carryforwards	45
Non-U.S. taxing jurisdictions | Unlimited
Net operating loss (NOL) carryforwards
NOL carryforwards	$ 53