| **Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions** | 12 Months Ended |        |
|----------------------------------------------------------------------------------|-----------------|--------|
||
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Total capitalized interest                                                       | $ (73)          | $ (49) | $ (84) |   |
| Goodwill                                                                         | 110             | 1,310  |   | $ 1,400 |
| Goodwill Impairment                                                              | 1,281           | 0      | $ 0 |   |
| Intangible assets, net                                                           | 310             | $ 0    |   |   |
| Amortization expense                                                             | 30              |   |   |   |
| Stranded tax assets                                                              | $ 6             |   |   |   |
| Minimum                                                                          |            |   |   |   |
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Useful lives of gathering facilitates and processing plants (in years)           | 3 years         |   |   |   |
| Intangible asset, useful life                                                    | 7 years         |   |   |   |
| Maximum                                                                          |            |   |   |   |
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Useful lives of gathering facilitates and processing plants (in years)           | 30 years        |   |   |   |
| Intangible asset, useful life                                                    | 13 years        |   |   |   |
| Pro Forma | ASU 2016-02 | Minimum                                                |            |   |   |   |
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Operating lease liability                                                        | $ 200           |   |   |   |
| Operating lease, right of use asset                                              | 200             |   |   |   |
| Pro Forma | ASU 2016-02 | Maximum                                                |            |   |   |   |
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Operating lease liability                                                        | 350             |   |   |   |
| Operating lease, right of use asset                                              | 350             |   |   |   |
| Texas                                                                            |            |   |   |   |
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Goodwill                                                                         |            |   |   | $ 1,300 |
| Midstream                                                                        |            |   |   |   |
| **Property, Plant and Equipment [Line Items]**                                   |            |   |   |   |
| Goodwill                                                                         | $ 110           |   |   |   |

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| - Definition
Tax Cuts And Jobs Act Of 2017, Stranded Tax Assets
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| - Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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| - Definition
Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.
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| - Definition
Amount of interest capitalized during the period.
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| - Definition
Present value of lessee's discounted obligation for lease payments from operating lease.
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| - Definition
Amount of lessee's right to use underlying asset under operating lease.
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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
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