Employee Benefit Plans U.S and International Subsidiary Savings Plans (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| U.S. savings plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Expense for the U.S. and International subsidiary savings plan | $ 22 | $ 21 | $ 19 |
| International subsidiary savings plans | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Expense for the U.S. and International subsidiary savings plan | $ 17 | $ 17 | $ 16 |