| **Consolidated Statements of Equity - USD ($) $ in Millions**            | Total    | Common Stock | Additional Paid in Capital | Accumulated Other Comprehensive Loss | Treasury Stock at Cost | Retained Earnings | Non- controlling Interests |
|--------------------------------------------------------------------------|----------|--------------|----------------------------|--------------------------------------|------------------------|-------------------|----------------------------|
| Balance at Beginning of Period at Dec. 31, 2016                          | $ 9,600  | $ 5          | $ 6,450                    | $ (31)                               | $ (692)                | $ 3,556           | $ 312                      |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**           |     |         |                       |                                 |                   |              |                       |
| Net Income                                                               | (1,566)  |         |                       |                                 |                   | (1,612)           | 46                         |
| Clayton Williams Energy Acquisition                                      | 1,851    |         | 1,876                      |                                 | (25)                   |              |                       |
| Stock-based Compensation                                                 | 80       |         | 80                         |                                 |                   |              |                       |
| Dividends                                                                | (141)    |         |                       |                                 |                   | (141)             |                       |
| Issuance of Noble Midstream Partners Common Units, Net of Offering Costs | 138      |         |                       |                                 |                   |              | 138                        |
| Distributions to Noncontrolling Interest Owners                          | (19)     |         |                       |                                 |                   |              | (19)                       |
| Other                                                                    | 0        |         | 9                          | 2                                    | (11)                   |              |                       |
| Balance at End of Period at Sep. 30, 2017                                | 9,943    | 5            | 8,415                      | (29)                                 | (728)                  | 1,803             | 477                        |
| Balance at Beginning of Period at Dec. 31, 2017                          | 10,619   | 5            | 8,438                      | (30)                                 | (725)                  | 2,248             | 683                        |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**           |     |         |                       |                                 |                   |              |                       |
| Net Income                                                               | 816      |         |                       |                                 |                   | 758               | 58                         |
| Stock-based Compensation                                                 | 63       |         | 63                         |                                 |                   |              |                       |
| Dividends                                                                | (156)    |         |                       |                                 |                   | (156)             |                       |
| Purchase and Retirement of Common Stock                                  | (233)    |         | (233)                      |                                 |                   |              |                       |
| Clayton Williams Energy Acquisition                                      | (25)     |         | (25)                       |                                 |                   |              |                       |
| Contributions from Noncontrolling Interest Owners                        | 348      |         |                       |                                 |                   |              | 348                        |
| Distributions to Noncontrolling Interest Owners                          | (35)     |         |                       |                                 |                   |              | (35)                       |
| Other                                                                    | (3)      |         |                       | 3                                    | (6)                    |              |                       |
| Balance at End of Period at Sep. 30, 2018                                | $ 11,394 | $ 5          | $ 8,249                    | $ (27)                               | $ (731)                | $ 2,850           | $ 1,048                    |

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Adjustments To Additional Paid In Capital, Acquisitions
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Noncontrolling Interest, Increase From Contribution
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
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| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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| - Definition
Value of stock issued pursuant to acquisitions during the period.
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| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
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| - Definition
Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
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This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
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