| **Goodwill and Intangible Assets Schedule of Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Millions** | 3 Months Ended | 6 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | $ 6,070 |   |
| Goodwill impairment                                                                                                     | $ (1,841)      | $ 0            | (1,841) | $ 0 |
| Goodwill at June 30, 2016                                                                                               | 4,233          |           | 4,233 |   |
| North America                                                                                                           |           |           |   |   |
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | 3,097 |   |
| Goodwill impairment                                                                                                     |           |           | (1,530) |   |
| Goodwill, Translation Adjustments                                                                                       |           |           | 2 |   |
| Goodwill at June 30, 2016                                                                                               | 1,569          |           | 1,569 |   |
| Latin America                                                                                                           |           |           |   |   |
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | 584 |   |
| Goodwill impairment                                                                                                     |           |           | 0 |   |
| Goodwill, Translation Adjustments                                                                                       |           |           | 3 |   |
| Goodwill at June 30, 2016                                                                                               | 587            |           | 587 |   |
| Europe/Africa/Russia Caspian                                                                                            |           |           |   |   |
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | 1,068 |   |
| Goodwill impairment                                                                                                     |           |           | 0 |   |
| Goodwill, Translation Adjustments                                                                                       |           |           | (1) |   |
| Goodwill at June 30, 2016                                                                                               | 1,067          |           | 1,067 |   |
| Middle East/Asia Pacific                                                                                                |           |           |   |   |
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | 819 |   |
| Goodwill impairment                                                                                                     |           |           | 0 |   |
| Goodwill, Translation Adjustments                                                                                       |           |           | 0 |   |
| Goodwill at June 30, 2016                                                                                               | 819            |           | 819 |   |
| Industrial Services                                                                                                     |           |           |   |   |
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | 502 |   |
| Goodwill impairment                                                                                                     |           |           | (311) |   |
| Goodwill, Translation Adjustments                                                                                       |           |           | 0 |   |
| Goodwill at June 30, 2016                                                                                               | 191            |           | 191 |   |
| Total                                                                                                                   |           |           |   |   |
| **Goodwill [Line Items]**                                                                                               |           |           |   |   |
| Goodwill at December 31, 2015                                                                                           |           |           | 6,070 |   |
| Goodwill impairment                                                                                                     |           |           | (1,841) |   |
| Goodwill, Translation Adjustments                                                                                       |           |           | 4 |   |
| Goodwill at June 30, 2016                                                                                               | $ 4,233        |           | $ 4,233 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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