Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended		96 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2025
Income Tax Contingency [Line Items]
Effective income tax rate	21.20%	24.20%
Minimum | Scenario, Forecast
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 1
Maximum | Scenario, Forecast
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 3