Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 15,232 | $ 15,277 |
| Americas [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 13,784 | 13,830 |
| Europe [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 1,360 | 1,360 |
| Asia-Pacific [Member] | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 88 | $ 87 |