| **Basis of Presentation - Balance Sheet Information (Details) - USD ($) $ in Millions** | Mar. 31, 2019 | Dec. 31, 2018 |
|-----------------------------------------------------------------------------------------|---------------|---------------|
| **Accounts Receivable, Net**                                                            |          |          |
| Commodity Sales                                                                         | $ 384         | $ 383         |
| Joint Interest Billings                                                                 | 124           | 137           |
| Other                                                                                   | 80            | 111           |
| Allowance for Doubtful Accounts                                                         | (15)          | (15)          |
| Total                                                                                   | 573           | 616           |
| **Other Current Assets**                                                                |          |          |
| Commodity Derivative Assets                                                             | 9             | 180           |
| Inventories, Materials and Supplies                                                     | 70            | 55            |
| Assets Held for Sale                                                                    | 0             | 133           |
| Prepaid Expenses and Other Current Assets                                               | 63            | 50            |
| Total                                                                                   | 142           | 418           |
| **Other Noncurrent Assets**                                                             |          |          |
| Equity Method Investments                                                               | 559           | 286           |
| Operating Lease Right of Use Assets                                                     | 273           | 0             |
| Customer-Related Intangible Assets, Net                                                 | 302           | 310           |
| Goodwill                                                                                | 110           | 110           |
| Other Assets, Noncurrent                                                                | 132           | 135           |
| Total                                                                                   | 1,376         | 841           |
| **Other Current Liabilities**                                                           |          |          |
| Production and Ad Valorem Taxes                                                         | 106           | 103           |
| Asset Retirement Obligations                                                            | 118           | 118           |
| Interest Payable                                                                        | 85            | 66            |
| Other Liabilities, Current                                                              | 350           | 232           |
| Total                                                                                   | 659           | 519           |
| **Other Noncurrent Liabilities**                                                        |          |          |
| Deferred Compensation Liabilities                                                       | 149           | 147           |
| Asset Retirement Obligations                                                            | 749           | 762           |
| Operating Lease Liabilities                                                             | 194           | 0             |
| Firm Transportation Exit Cost Accrual                                                   | 156           | 67            |
| Production and Ad Valorem Taxes                                                         | 88            | 83            |
| Other Liabilities, Noncurrent                                                           | 102           | 106           |
| Total                                                                                   | 1,438         | 1,165         |
| Accumulated amortization                                                                | 38            | $ 30          |
| EPIC Y-Grade, LP | Noble Midstream                                                      |          |          |
| **Other Noncurrent Assets**                                                             |          |          |
| Equity Method Investments                                                               | 227           |          |
| Delaware Crossing JV | Noble Midstream                                                  |          |          |
| **Other Noncurrent Assets**                                                             |          |          |
| Equity Method Investments                                                               | $ 38          |          |

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Firm Transportation Liability, Noncurrent
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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.
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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.
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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.
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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.
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The amount of identifiable intangible assets recognized as of the acquisition date.
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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.
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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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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.
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Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells.  For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.
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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.
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Amount of lessee's right to use underlying asset under operating lease.
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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
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Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.
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