Segment Information - Schedule of Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|---|---|---|---|
| Segment Reporting Information [Line Items] | |||
| Long-lived assets | $ 13,704 | $ 13,428 | $ 13,505 |
| Americas [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Long-lived assets | 13,422 | 13,151 | 13,204 |
| Europe [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Long-lived assets | 186 | 194 | 214 |
| Asia-Pacific [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Long-lived assets | $ 96 | $ 83 | $ 87 |