Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 13,748 | $ 13,677 |
| Americas [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 13,498 | 13,424 |
| Europe [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 163 | 163 |
| Asia-Pacific [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 87 | $ 90 |