| **Merger, Acquisitions and Divestitures - Sales Transactions (Details) - USD ($) $ in Millions** | 12 Months Ended |
|--------------------------------------------------------------------------------------------------|-----------------|
||
| **Business Acquisition [Line Items]**                                                            |            |   |   |
| Proceeds from Divestitures                                                                       | $ 151           | $ 321 | $ 327 |
| Asset Retirement Obligations Associated with Assets Sold                                         | 38              | 101 |   |
| Gain on Divestitures                                                                             | 0               | 73 | 36 |
| US Onshore Assets Sold                                                                           |            |   |   |
| **Business Acquisition [Line Items]**                                                            |            |   |   |
| Proceeds from Divestitures                                                                       | 151             | 135 | 150 |
| Net Book Value of Assets Sold                                                                    | (156)           | (150) | (117) |
| Goodwill Allocated to Assets Sold                                                                | (4)             | (7) | (8) |
| Asset Retirement Obligations Associated with Assets Sold                                         | 8               | 48 | 8 |
| Other Closing Adjustments                                                                        | 1               | 10 | 3 |
| Gain on Divestitures                                                                             | 0               | $ 36 | $ 36 |
| China                                                                                            |            |   |   |
| **Business Acquisition [Line Items]**                                                            |            |   |   |
| Proceeds from Divestitures                                                                       | 186             |   |   |
| Net Book Value of Assets Sold                                                                    | (149)           |   |   |
| Other Closing Adjustments                                                                        | 2               |   |   |
| Gain on Divestitures                                                                             | $ (35)          |   |   |

| X                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For the disposal group, obligations not otherwise itemized.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Write-off of the carrying amount (book value) associated with assets sold in the period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.
+ References
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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.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of divestiture 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.
+ References
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