| **Segment Information - Schedule of Revenue and Net PP&E by Geographic Location (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 | $ 2,410        | $ 2,353         | $ 2,408 | $ 2,670 | $ 3,394 | $ 3,786 | $ 3,968 | $ 4,594 | $ 9,841 | $ 15,742 | $ 24,551 |
| Net Property, Plant and Equipment                                                                                       | 4,271          |            |   |   | 6,693 |   |   |   | 4,271 | 6,693 | 9,063 |
| U.S.                                                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 |           |            |   |   |   |   |   |   | 2,875 | 5,800 | 11,499 |
| Net Property, Plant and Equipment                                                                                       | 1,792          |            |   |   | 2,989 |   |   |   | 1,792 | 2,989 | 4,417 |
| Canada and other                                                                                                        |           |            |   |   |   |   |   |   |   |   |   |
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 |           |            |   |   |   |   |   |   | 598 | 839 | 1,336 |
| Net Property, Plant and Equipment                                                                                       | 148            |            |   |   | 260 |   |   |   | 148 | 260 | 482 |
| North America                                                                                                           |           |            |   |   |   |   |   |   |   |   |   |
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 |           |            |   |   |   |   |   |   | 3,473 | 6,639 | 12,835 |
| Net Property, Plant and Equipment                                                                                       | 1,940          |            |   |   | 3,249 |   |   |   | 1,940 | 3,249 | 4,899 |
| Latin America                                                                                                           |           |            |   |   |   |   |   |   |   |   |   |
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 |           |            |   |   |   |   |   |   | 1,006 | 1,847 | 2,300 |
| Net Property, Plant and Equipment                                                                                       | 466            |            |   |   | 716 |   |   |   | 466 | 716 | 890 |
| Europe/ Africa/ Russia Caspian                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 |           |            |   |   |   |   |   |   | 2,457 | 3,555 | 4,705 |
| Net Property, Plant and Equipment                                                                                       | 984            |            |   |   | 1,400 |   |   |   | 984 | 1,400 | 1,805 |
| Middle East/ Asia Pacific                                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| **Revenue from geographic segments**                                                                                    |           |            |   |   |   |   |   |   |   |   |   |
| Revenue                                                                                                                 |           |            |   |   |   |   |   |   | 2,905 | 3,701 | 4,711 |
| Net Property, Plant and Equipment                                                                                       | $ 881          |            |   |   | $ 1,328 |   |   |   | $ 881 | $ 1,328 | $ 1,469 |

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| - Definition
Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
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