| **Basis of Presentation - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions** | 3 Months Ended | 9 Months Ended |          |         |        |        |
|--------------------------------------------------------------------------------------------------------|----------------|----------------|----------|---------|--------|--------|
||
| **Finite-Lived Intangible Assets [Line Items]**                                                        |           |           |     |    |   |   |   |   |
| Goodwill                                                                                               | $ 1,401        |           | $ 1,401  |    |   |   | $ 1,310 | $ 1,291 |
| Intangible assets, gross                                                                               | 318            |           | 318      |    |   |   |   |   |
| Amortization expense                                                                                   | $ 8            |           | $ 22     |    |   |   |   |   |
| Share purchase plan, authorized amount                                                                 |           |           |     |    |   | $ 750  |   |   |
| Shares repurchased and retired during period (in shares) | shares                                      | 3.4            |           | 7.4      |    |   |   |   |   |
| Repurchase price (in usd per share) | $ / shares                                                       | $ 30.07        |           | $ 31.34  |    |   |   |   |   |
| Revenues                                                                                               | $ 1,273        | $ 960          | $ 3,789  | $ 3,055 |   |   |   |   |
| Expenses                                                                                               | 775            | $ 958          | 2,240    | $ 5,318 |   |   |   |   |
| Stranded tax assets                                                                                    | 7              |           | $ 7      |    |   |   |   |   |
| Minimum                                                                                                |           |           |     |    |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                                        |           |           |     |    |   |   |   |   |
| Intangible asset, useful life                                                                          |           |           | 7 years  |    |   |   |   |   |
| Maximum                                                                                                |           |           |     |    |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                                        |           |           |     |    |   |   |   |   |
| Intangible asset, useful life                                                                          |           |           | 13 years |    |   |   |   |   |
| ASC 606                                                                                                |           |           |     |    |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                                        |           |           |     |    |   |   |   |   |
| Revenues                                                                                               | (2)            |           | $ 5      |    |   |   |   |   |
| Expenses                                                                                               | (2)            |           | $ 5      |    |   |   |   |   |
| West Africa                                                                                            |           |           |     |    |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                                        |           |           |     |    |   |   |   |   |
| Contractual sales price (in usd per MMBtu) | $ / MMBTU                                                 |           |           | 0.25     |    |   |   |   |   |
| Retained Earnings | ASC 606                                                                            |           |           |     |    |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                                        |           |           |     |    |   |   |   |   |
| Cumulative increase (decrease) effect of adoption                                                      | $ (2)          |           | $ (2)    |    | $ 5    |   |   |   |

| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual Obligation, Long-term Contract, Sales Price Per Unit
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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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| - Definition
Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.
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| - Definition
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
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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| - 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 before accumulated amortization of intangible assets, excluding goodwill.
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No definition available.
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| - 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.
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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).
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| - Definition
Amount of stock repurchase plan authorized.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
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| - Definition
Total cost of shares repurchased divided by the total number of shares repurchased.
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