Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 13,806 | $ 13,812 |
| Americas [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 13,551 | 13,560 |
| Europe [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 172 | 168 |
| Asia-Pacific [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 83 | $ 84 |