| **Asset Impairments Impaired Long-Lived Assets Held and Used- text (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      | $ 5            | $ 92            | $ 533 | $ 500 |
| Other (Onshore US)                                                                                     |           |            |   |   |
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      |           |            | 481 |   |
| Gulf of Mexico and Eastern Mediterranean                                                               |           |            |   |   |
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      |           |            | $ 47 |   |
| United States                                                                                          |           |            |   |   |
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      |           |            |   | 250 |
| South Raton (Deepwater Gulf of Mexico)                                                                 |           |            |   |   |
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      |           |            |   | 74 |
| Other Deepwater Gulf of Mexico                                                                         |           |            |   |   |
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      |           |            |   | 51 |
| Reclassification Of Non-Strategic Properties As Held For Sale                                          |           |            |   |   |
| **Impaired Long-Lived Assets Held and Used [Line Items]**                                              |           |            |   |   |
| Asset Impairments                                                                                      |           |            |   | $ 31 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ Details**Name:**us-gaap_ImpairedLongLivedAssetsHeldAndUsedLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585
+ Details**Name:**us-gaap_ImpairmentOfOilAndGasProperties**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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