| **Equity Method Investments (Details) - USD ($) $ in Millions**                                                    | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Equity Method Investments                                                                                          | $ 400          | $ 305           | $ 400 | $ 453 |
| **Equity Method Investment, Financial Statement, Reported Amounts [Abstract]**                                     |           |            |   |   |
| Retained earnings related to undistributed earnings of equity method investees                                     |           | 90              |   |   |
| **AMPCO Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]**            |           |            |   |   |
| Difference between the carrying value of an equity method investment and the underlying net assets of the investee |           | 12              |   |   |
| **Balance Sheet Information**                                                                                      |           |            |   |   |
| Current Assets                                                                                                     | 313            | 390             | 313 |   |
| Noncurrent Assets                                                                                                  | 1,390          | 588             | 1,390 |   |
| Current Liabilities                                                                                                | 149            | 171             | 149 |   |
| Noncurrent Liabilities                                                                                             | 256            | 90              | 256 |   |
| **Statements of Operations Information**                                                                           |           |            |   |   |
| Operating Revenues                                                                                                 |           | 790             | 667 | 645 |
| Operating Expenses                                                                                                 |           | 303             | 355 | 393 |
| Operating Income                                                                                                   |           | 487             | 312 | 252 |
| Other (Income) Net                                                                                                 |           | (15)            | (7) | (9) |
| Income Before Income Taxes                                                                                         |           | 502             | 319 | 261 |
| Income Tax Provision                                                                                               |           | 136             | 60 | 46 |
| Net Income                                                                                                         |           | $ 366           | 259 | $ 215 |
| Advantage Pipeline                                                                                                 |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Ownership interest in equity method investments                                                                    |           | 50.00%          |   |   |
| Equity Method Investments                                                                                          | 0              | $ 70            | 0 |   |
| CONE Investments                                                                                                   |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Ownership interest in equity method investments                                                                    |           | 50.00%          |   |   |
| Distributions from equity method investments                                                                       | 70             |            |   |   |
| Equity Method Investments                                                                                          | 172            | $ 0             | 172 |   |
| CONE Midstream                                                                                                     |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Ownership interest in equity method investments                                                                    |           | 34.00%          |   |   |
| Atlantic Methanol Production Company                                                                               |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Ownership interest in equity method investments                                                                    |           | 45.00%          |   |   |
| Alba Plant                                                                                                         |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Ownership interest in equity method investments                                                                    |           | 28.00%          |   |   |
| Equity Method Investments                                                                                          | 82             | $ 80            | 82 |   |
| AMPCO                                                                                                              |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Equity Method Investments                                                                                          | 120            | 129             | 120 |   |
| Other                                                                                                              |           |            |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                             |           |            |   |   |
| Equity Method Investments                                                                                          | $ 26           | $ 26            | $ 26 |   |

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| - Definition
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| - Definition
This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. Such summarized financial information may, at a minimum, include the net amount of other nonoperating income and expense.
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| - Definition
This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. Such summarized financial information may, at a minimum, include the income tax expense for the year.
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| - Definition
Amount of consolidated retained earnings that represent undistributed earnings of 50% or less owned by persons accounted for by the equity method.
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| - Definition
Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.
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| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
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| - Definition
The amount of the cost of sales reported by an equity method investment of the entity.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of current assets reported by an equity method investment of the entity.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of current liabilities reported by an equity method investment of the entity.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of gross profit (loss) reported by an equity method investment of the entity.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) reported by an equity method investment of the entity.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of noncurrent assets reported by an equity method investment of the entity.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of noncurrent liabilities reported by an equity method investment of the entity.
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| - Definition
The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.
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| - Definition
Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.
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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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