Inventories (Additional Information) (Details) - USD ($) $ in Millions |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Inventory Disclosure [Line Items] | ||
| First-in, first-out method of inventory valuation, amount of increase in inventory value | $ 102 | $ 106 |
| UNITED STATES | ||
| Inventory Disclosure [Line Items] | ||
| U.S. inventories as a percentage of total inventories | 35.00% | 38.00% |