Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Segment Reporting Information [Line Items] | |||
| Revenue | $ 27,810 | $ 35,475 | $ 48,580 |
| Operating Segments | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 27,810 | 35,475 | 48,580 |
| Operating Segments | North America | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 6,665 | 9,811 | 16,151 |
| Operating Segments | Latin America | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 4,230 | 6,014 | 7,699 |
| Operating Segments | Europe/CIS/Africa | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 7,351 | 9,284 | 12,515 |
| Operating Segments | Middle East & Asia | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 9,286 | 9,898 | 11,875 |
| Eliminations & other | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | $ 278 | $ 468 | $ 340 |