| **Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 3 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Cash Flows From Operating Activities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                |   |  |   |
| Net Loss                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                | $ (287) | [1] | $ (22) |
| **Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                |   |  |   |
| Depreciation, Depletion and Amortization                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                | 617 |  | 454 |
| Asset Impairments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | [2]            | 0 |  | 27 |
| Dry Hole Cost                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                | 93 |  | 20 |
| Gain on Extinguishment of Debt                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | [3]            | (80) |  | 0 |
| Loss on Asset Due to Terminated Contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | [4]            | 42 |  | 0 |
| Deferred Income Tax Benefit                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                | (186) |  | (30) |
| Loss from Equity Method Investees, Net of Dividends                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                | (3) |  | (18) |
| Gain on Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                | (44) |  | (150) |
| Net Cash Received in Settlement of Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                | 178 |  | 210 |
| Stock Based Compensation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                | 20 |  | 21 |
| Other Adjustments for Noncash Items Included in Income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                | 37 |  | 11 |
| **Changes in Operating Assets and Liabilities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |                |   |  |   |
| (Increase) Decrease in Accounts Receivable                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                | (38) |  | 107 |
| Decrease in Accounts Payable                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                | (24) |  | (71) |
| (Decrease) Increase in Current Income Taxes Payable                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                | (16) |  | 3 |
| Other Current Assets and Liabilities, Net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                | (64) |  | (51) |
| Other Operating Assets and Liabilities, Net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                | 6 |  | 30 |
| Net Cash Provided by Operating Activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                | 251 |  | 541 |
| **Cash Flows From Investing Activities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                |   |  |   |
| Additions to Property, Plant and Equipment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                | (496) |  | (1,111) |
| Additions to Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |                | (6) |  | (44) |
| Proceeds from Divestitures and Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                | 238 |  | 119 |
| Net Cash Used in Investing Activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |                | (264) |  | (1,036) |
| **Cash Flows From Financing Activities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                |   |  |   |
| Dividends Paid, Common Stock                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                | (41) |  | (64) |
| Proceeds from Issuance of Shares of Common Stock to Public, Net of Offering Costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |                | 0 |  | 1,112 |
| Proceeds from Term Loan Facility                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |                | 1,400 |  | 0 |
| Repayment of Senior Notes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                | (1,383) |  | 0 |
| Repayment of Capital Lease Obligation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |                | (13) |  | (19) |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |                | (25) |  | (8) |
| Net Cash (Used in) Provided by Financing Activities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |                | (62) |  | 1,021 |
| (Decrease) Increase in Cash and Cash Equivalents                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |                | (75) |  | 526 |
| Cash and Cash Equivalents at Beginning of Period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |                | 1,028 |  | 1,183 |
| Cash and Cash Equivalents at End of Period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                | $ 953 |  | $ 1,709 |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [1]No pro forma adjustments were made for the period as the acquisition is included in the Company's historical results.[2]Impairments during 2015 were related to facility costs at South Raton (Deepwater Gulf of Mexico) and increases in expected field abandonment cost for the Noa and Pinnacles fields (Eastern Mediterranean).[3]Amount relates to the tendering of senior notes assumed in the Rosetta Merger. See Note 6. Debt.[4]Amount relates to the termination of a rig contract offshore Falkland Islands as a result of a supplier's non-performance. See Note 8. Capitalized Exploratory Well Costs and Undeveloped Leasehold |

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| - Definition
The cash received (paid) on derivative instruments not designated or qualifying as hedging instruments as a result of settlement of derivative instruments during the period.
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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. 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. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. 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. Includes effect from exchange rate changes.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.
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| - Definition
Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.
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| - Definition
Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.
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| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
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| - Definition
The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.
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| - Definition
This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.
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| - Definition
The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.
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| - Definition
The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.
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| - Definition
The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.
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Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.
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Amount of increase (decrease) in operating liabilities classified as other.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
+ References
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.
+ 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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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
+ References
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