Goodwill and Other Intangible Assets - Amortization Expense Related to Amortizable Intangible Assets (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Goodwill and Intangible Assets Disclosure [Abstract] | ||
| Charged to cost of sales | $ 1 | $ 1 |
| Charged to amortization of intangibles | 2 | 2 |
| Total amortization | $ 3 | $ 3 |