| **Clayton Williams Energy Acquisition - Tables (Details) - USD ($) $ / shares in Units, $ in Millions** |         | 3 Months Ended | 6 Months Ended |          |
|---------------------------------------------------------------------------------------------------------|---------|----------------|----------------|----------|
||
| **Business Acquisition [Line Items]**                                                                   |    |           |           |     |   |   |   |
| Plus: Cash Consideration Paid to Clayton Williams Energy Stockholders                                   |    |           |           |     | $ 616 | $ 0 |   |
| Total Purchase Price                                                                                    |    |           | $ 301          |     |   |   |   |
| Goodwill                                                                                                |    | $ 1,289        |           |     | 1,289 |   | $ 0 |
| Clayton Williams Energy                                                                                 |    |           |           |     |   |   |   |
| **Business Acquisition [Line Items]**                                                                   |    |           |           |     |   |   |   |
| Fair Value of Common Stock Issued                                                                       | $ 1,876 |           |           |     |   |   |   |
| Plus: Cash Consideration Paid to Clayton Williams Energy Stockholders                                   | 637     |           |           |     |   |   |   |
| Total Purchase Price                                                                                    | 2,513   |           |           |     |   |   |   |
| Accounts Payable                                                                                        | 68      |           |           |     |   |   |   |
| Other Current Liabilities                                                                               | 38      |           |           |     |   |   |   |
| Long-Term Deferred Tax Liability                                                                        | 522     |           |           |     |   |   |   |
| Long-Term Debt                                                                                          | 595     |           |           |     |   |   |   |
| Asset Retirement Obligations                                                                            | 59      |           |           |     |   |   |   |
| Total Purchase Price Plus Liabilities Assumed                                                           | 3,795   |           |           |     |   |   |   |
| Cash and Cash Equivalents                                                                               | 21      |           |           |     |   |   |   |
| Other Current Assets                                                                                    | 37      |           |           |     |   |   |   |
| Proved Reserves                                                                                         | 724     |           |           |     |   |   |   |
| Undeveloped Leasehold Cost                                                                              | 1,581   |           |           |     |   |   |   |
| Gathering and Processing Assets                                                                         | 49      |           |           |     |   |   |   |
| Asset Retirement Costs                                                                                  | 59      |           |           |     |   |   |   |
| Other Property Plant and Equipment                                                                      | 18      |           |           |     |   |   |   |
| Other Noncurrent Assets                                                                                 | 17      |           |           |     |   |   |   |
| Goodwill                                                                                                | 1,289   | 1,300          |           |     | 1,300 |   |   |
| Total Asset Value                                                                                       | $ 3,795 |           |           |     |   |   |   |
| Revenues                                                                                                |    | 1,070          |           | $ 888    | 2,141 | 1,641 |   |
| Net Loss and Comprehensive Loss Attributable to Noble Energy                                            |    | $ (1,354)      |           | $ (316)  | $ (1,324) | $ (649) |   |
| Net Loss Attributable to Noble Energy per Common Share - Basic and Diluted ($ per share)                |    | $ (2.77)       |           | $ (0.65) | $ (2.71) | $ (1.34) |   |

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.
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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.
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Amount of assets acquired at the acquisition date.
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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.
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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.
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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.
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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.
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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.
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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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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
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