| **Noble Midstream Partners LP (Details) - USD ($) $ / shares in Units, $ in Millions**                                    |            | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------|------------|-----------------|
||
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Proceeds from Issuance or Sale of Equity                                                                                  |       | $ 0             | $ 1,112 | $ 0 |
| IPO | Noble Midstream Revolving Credit Facility, due September 20, 2021                                                   |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Offering costs                                                                                                            | $ 24       |            |   |   |
| IPO | Noble Midstream Revolving Credit Facility, due September 20, 2021 | Common Units                                    |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Sale (units)                                                                                                              | 14,375,000 |            |   |   |
| Issued ($ per share)                                                                                                      | $ 22.50    |            |   |   |
| Issued, net ($ per share)                                                                                                 | $ 21.21    |            |   |   |
| Over-Allotment Option | Noble Midstream Revolving Credit Facility, due September 20, 2021 | Common Units                  |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Sale (units)                                                                                                              | 1,875,000  |            |   |   |
| Noble Energy | Noble Midstream Revolving Credit Facility, due September 20, 2021 | Common Units                           |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Sale (units)                                                                                                              | 1,527,584  |            |   |   |
| Noble Energy | Noble Midstream Revolving Credit Facility, due September 20, 2021 | Subordinated Units                     |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Sale (units)                                                                                                              | 15,902,584 |            |   |   |
| Affiliated Entity | Noble Energy | Noble Midstream Revolving Credit Facility, due September 20, 2021 | Common Units       |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Ownership                                                                                                                 | 4.80%      |            |   |   |
| Affiliated Entity | Noble Energy | Noble Midstream Revolving Credit Facility, due September 20, 2021 | Subordinated Units |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Ownership                                                                                                                 | 50.00%     |            |   |   |
| Noble Midstream Partners LP | Noble Midstream Revolving Credit Facility, due September 20, 2021                           |       |            |   |   |
| **Related Party Transaction [Line Items]**                                                                                |       |            |   |   |
| Proceeds from Issuance or Sale of Equity                                                                                  | $ 299      | $ 299           | $ 0 | $ 0 |

| X                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Shares Issued, Price Per Share, Net
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cumulative amount of offering costs allocated to the limited partners.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.
+ References
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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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| X                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Per share or per unit amount of equity securities issued.
+ References
No definition available.
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| X                                                                                                                                           |
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| X                                                                                                                                    |
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| X                                                                                                                                          |
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