| **Revenue from Contracts with Customers - Narrative (Details) $ in Millions** | 12 Months Ended |
|-------------------------------------------------------------------------------|-----------------|
||
| **Disaggregation of Revenue [Line Items]**                                    |            |   |   |
| Revenue (less than $1 million)                                                | $ 4,986         | $ 4,256 | $ 3,491 |
| Operating expenses (less than $1 million)                                     | $ 4,635         | $ 6,058 | $ 4,867 |
| West Africa                                                                   |            |   |   |
| **Disaggregation of Revenue [Line Items]**                                    |            |   |   |
| Contractual sales price (in usd per MMBtu) | $ / MMBTU                        | 0.25            |   |   |
| ASU 2014-09                                                                   |            |   |   |
| **Disaggregation of Revenue [Line Items]**                                    |            |   |   |
| Revenue (less than $1 million)                                                | $ 1             |   |   |
| Operating expenses (less than $1 million)                                     | $ 1             |   |   |

| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual Obligation, Long-term Contract, Sales Price Per Unit
+ References
No definition available.
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| 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.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.
+ References
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| X                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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