Segment and Geographic Area Information - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Revenues from External Customers and Long-Lived Assets | ||
| Total long-lived assets | $ 2,962 | $ 2,883 |
| United States and Puerto Rico | ||
| Revenues from External Customers and Long-Lived Assets | ||
| Total long-lived assets | 2,026 | 1,993 |
| Europe | ||
| Revenues from External Customers and Long-Lived Assets | ||
| Total long-lived assets | 646 | 599 |
| All other | ||
| Revenues from External Customers and Long-Lived Assets | ||
| Total long-lived assets | $ 290 | $ 291 |