| **Marcellus Share Firm Transportation Contracts - Income Statement Disclosures (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Long-term Purchase Commitment [Line Items]**                                                                     |           |           |   |   |
| Purchased Oil and Gas                                                                                              | $ 76           | $ 0            | $ 204 | $ 0 |
| Revenues                                                                                                           | 1,273          | 960            | 3,789 | 3,055 |
| Operating Segments | United States                                                                                 |           |           |   |   |
| **Long-term Purchase Commitment [Line Items]**                                                                     |           |           |   |   |
| Sales of Purchased Oil and Gas                                                                                     |           | 0              |   | 0 |
| Purchased Oil and Gas                                                                                              | 32             | 0              | 98 | 0 |
| Revenues                                                                                                           | 945            | 696            | 2,818 | 2,246 |
| Cost of Purchased of Gas | Operating Segments | United States                                                      |           |           |   |   |
| **Long-term Purchase Commitment [Line Items]**                                                                     |           |           |   |   |
| Purchased Oil and Gas                                                                                              | 24             | 0              | 77 | 0 |
| Firm Transportation Expense | Operating Segments | United States                                                   |           |           |   |   |
| **Long-term Purchase Commitment [Line Items]**                                                                     |           |           |   |   |
| Purchased Oil and Gas                                                                                              | 7              | 0              | 18 | 0 |
| Unutilized Firm Transportation Expense | Operating Segments | United States                                        |           |           |   |   |
| **Long-term Purchase Commitment [Line Items]**                                                                     |           |           |   |   |
| Purchased Oil and Gas                                                                                              | 1              | 0              | 3 | 0 |
| Sales of Purchased Gas, Net | Operating Segments | United States                                                   |           |           |   |   |
| **Long-term Purchase Commitment [Line Items]**                                                                     |           |           |   |   |
| Revenues                                                                                                           | $ (6)          | $ 0            | $ (17) | $ 0 |

| X                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Revenue From Sales Of Purchased Oil And Gas
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Costs of generating revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.
+ 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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
+ References
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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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