| **Basis of Presentation (Details 2) (USD $)In Millions, unless otherwise specified**                                                                                                                                              | 3 Months Ended | 6 Months Ended |        |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Production Expense**                                                                                                                                                                                                            |           |                |   |  |   |  |   |  |   |  |
| Lease Operating Expense                                                                                                                                                                                                           | $ 154          |                | $ 140  |  | $ 299 |  | $ 257 |  |   |  |
| Production and Ad Valorem Taxes                                                                                                                                                                                                   | 53             |                | 43     |  | 102 |  | 86 |  |   |  |
| Transportation and Gathering Expense                                                                                                                                                                                              | 41             |                | 27     |  | 80 |  | 55 |  |   |  |
| Total                                                                                                                                                                                                                             | 248            |                | 210    |  | 481 |  | 398 |  |   |  |
| **Other Non-Operating (Income) Expense, Net**                                                                                                                                                                                     |           |                |   |  |   |  |   |  |   |  |
| Deferred Compensation Expense                                                                                                                                                                                                     | 8              | [1]            | 3      | [1] | 12 | [1] | 14 | [1] |   |  |
| Other Expense, Net                                                                                                                                                                                                                | 0              |                | 0      |  | 1 |  | (2) |  |   |  |
| Total                                                                                                                                                                                                                             | 8              |                | 3      |  | 13 |  | 12 |  |   |  |
| **Accounts Receivable, Net**                                                                                                                                                                                                      |           |                |   |  |   |  |   |  |   |  |
| Proceeds Receivable from China Asset Sale                                                                                                                                                                                         | 150            | [2]            |   |  | 150 | [2] |   |  | 0 | [2] |
| Commodity Sales                                                                                                                                                                                                                   | 464            |                |   |  | 464 |  |   |  | 495 |  |
| Joint Interest Billings                                                                                                                                                                                                           | 310            |                |   |  | 310 |  |   |  | 382 |  |
| Other                                                                                                                                                                                                                             | 91             |                |   |  | 91 |  |   |  | 81 |  |
| Allowance for Doubtful Accounts                                                                                                                                                                                                   | (11)           |                |   |  | (11) |  |   |  | (11) |  |
| Total                                                                                                                                                                                                                             | 1,004          |                |   |  | 1,004 |  |   |  | 947 |  |
| **Other Current Assets**                                                                                                                                                                                                          |           |                |   |  |   |  |   |  |   |  |
| Inventories, Materials and Supplies                                                                                                                                                                                               | 94             |                |   |  | 94 |  |   |  | 96 |  |
| Inventories, Crude Oil                                                                                                                                                                                                            | 23             |                |   |  | 23 |  |   |  | 25 |  |
| Deferred Income Taxes, Net                                                                                                                                                                                                        | 63             |                |   |  | 63 |  |   |  | 62 |  |
| Assets Held-for-Sale                                                                                                                                                                                                              | 74             |                |   |  | 74 |  |   |  | 292 |  |
| Prepaid Expenses and Other Current Assets                                                                                                                                                                                         | 58             |                |   |  | 58 |  |   |  | 72 |  |
| Total                                                                                                                                                                                                                             | 312            |                |   |  | 312 |  |   |  | 547 |  |
| **Other Noncurrent Assets**                                                                                                                                                                                                       |           |                |   |  |   |  |   |  |   |  |
| Equity Method Investments                                                                                                                                                                                                         | 484            |                |   |  | 484 |  |   |  | 437 |  |
| Mutual Fund Investments                                                                                                                                                                                                           | 121            |                |   |  | 121 |  |   |  | 114 |  |
| Commodity Derivative Assets                                                                                                                                                                                                       | 2              |                |   |  | 2 |  |   |  | 16 |  |
| Other Assets                                                                                                                                                                                                                      | 97             |                |   |  | 97 |  |   |  | 112 |  |
| Total                                                                                                                                                                                                                             | 704            |                |   |  | 704 |  |   |  | 679 |  |
| **Other Current Liabilities**                                                                                                                                                                                                     |           |                |   |  |   |  |   |  |   |  |
| Production and Ad Valorem Taxes                                                                                                                                                                                                   | 111            |                |   |  | 111 |  |   |  | 103 |  |
| Commodity Derivative Liabilities                                                                                                                                                                                                  | 199            |                |   |  | 199 |  |   |  | 65 |  |
| Income Taxes Payable                                                                                                                                                                                                              | 77             |                |   |  | 77 |  |   |  | 156 |  |
| Asset Retirement Obligations                                                                                                                                                                                                      | 141            |                |   |  | 141 |  |   |  | 39 |  |
| Interest Payable                                                                                                                                                                                                                  | 61             |                |   |  | 61 |  |   |  | 63 |  |
| Current Portion of Long Term Debt                                                                                                                                                                                                 | 0              | [3]            |   |  | 0 | [3] |   |  | 200 | [3] |
| Current Portion of Capital Lease                                                                                                                                                                                                  | 59             | [3]            |   |  | 59 | [3] |   |  | 58 | [3] |
| Liabilities Associated with Assets Held for Sale                                                                                                                                                                                  | 14             |                |   |  | 14 |  |   |  | 111 |  |
| Other                                                                                                                                                                                                                             | 204            |                |   |  | 204 |  |   |  | 193 |  |
| Total                                                                                                                                                                                                                             | 866            |                |   |  | 866 |  |   |  | 988 |  |
| **Other Noncurrent Liabilities**                                                                                                                                                                                                  |           |                |   |  |   |  |   |  |   |  |
| Deferred Compensation Liabilities                                                                                                                                                                                                 | 276            |                |   |  | 276 |  |   |  | 253 |  |
| Asset Retirement Obligations                                                                                                                                                                                                      | 563            |                |   |  | 563 |  |   |  | 547 |  |
| Accrued Benefit Costs                                                                                                                                                                                                             | 108            |                |   |  | 108 |  |   |  | 155 |  |
| Commodity Derivative Liabilities                                                                                                                                                                                                  | 89             |                |   |  | 89 |  |   |  | 10 |  |
| Other                                                                                                                                                                                                                             | 107            |                |   |  | 107 |  |   |  | 144 |  |
| Total                                                                                                                                                                                                                             | $ 1,143        |                |   |  | $ 1,143 |  |   |  | $ 1,109 |  |
|                                                                                                                                                                                                                                   |
| [1]Amounts represent increases in the fair value of shares of our common stock held in a rabbi trust.[2]The sale was completed on June 30, 2014; bank transfer of the proceeds was completed on July 2, 2014.[3]See Note 6. Debt. |

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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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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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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.
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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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or 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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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or 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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
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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| - Definition
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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| - Definition
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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| - Definition
Amount of lease operating expense related to property used in oil and gas production.
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| - Definition
The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).
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| - Definition
Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities.
+ References
No definition available.
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| - Definition
Sum of the carrying values as of the balance sheet date of the portions of all long-term notes and loans payable due within one year or the operating cycle if longer.
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| - Definition
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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| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. 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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| - Definition
Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).
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| - Definition
Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
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| - Definition
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).
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| - Definition
The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.
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| - Definition
Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy.
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| - Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
+ References
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| - Definition
A tax assessed on oil and gas production.
+ References
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| - Definition
Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447
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| - Definition
Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(17)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862
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