| **Fair Value Measurements and Disclosures of Assets and Liabilities Measured on a Nonrecurring Basis (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Financial Assets**                                                                                                                     |           |            |   |   |
| Mutual Fund Investments                                                                                                                  | $ 90           | $ 71            | $ 90 |   |
| Commodity Derivative Instruments                                                                                                         | 592            | 0               | 592 |   |
| **Financial Liabilities**                                                                                                                |           |            |   |   |
| Commodity Derivative Instruments                                                                                                         | 0              | (116)           | 0 |   |
| Stock Based Compensation Liability Measured at Fair Value                                                                                | (98)           | (88)            | (98) |   |
| Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability                                                        |           | (9)             |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                  |           |            |   |   |
| Impaired Oil and Gas Properties                                                                                                          | 5              | 92              | 533 | $ 500 |
| Oil and Gas Property, Net Book Value                                                                                                     |           | 92              | 1,285 |   |
| Impaired Materials and Supplies Inventory                                                                                                |           | 14              | 20 |   |
| Material and Supply Inventory, Net Book Value                                                                                            |           | $ 105           | 81 |   |
| Impaired Oil and Gas Properties, Net Book Value                                                                                          |           |            |   | 600 |
| Discount Rate for Impairment Model                                                                                                       |           | 10.00%          |   |   |
| Quoted Prices in Active Markets (Level 1)                                                                                                |           |            |   |   |
| **Financial Assets**                                                                                                                     |           |            |   |   |
| Mutual Fund Investments                                                                                                                  | 90             | $ 71            | 90 |   |
| Commodity Derivative Instruments                                                                                                         | 0              | 0               | 0 |   |
| **Financial Liabilities**                                                                                                                |           |            |   |   |
| Commodity Derivative Instruments                                                                                                         | 0              | 0               | 0 |   |
| Stock Based Compensation Liability Measured at Fair Value                                                                                | (98)           | (88)            | (98) |   |
| Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability                                                        |           | (9)             |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                  |           |            |   |   |
| Impaired Oil and Gas Properties                                                                                                          |           | 0               | 0 | 0 |
| Impaired Materials and Supplies Inventory                                                                                                |           | 0               | 0 |   |
| Significant Other Observable Inputs (Level 2)                                                                                            |           |            |   |   |
| **Financial Assets**                                                                                                                     |           |            |   |   |
| Mutual Fund Investments                                                                                                                  | 0              | 0               | 0 |   |
| Commodity Derivative Instruments                                                                                                         | 600            | 5               | 600 |   |
| **Financial Liabilities**                                                                                                                |           |            |   |   |
| Commodity Derivative Instruments                                                                                                         | (8)            | (121)           | (8) |   |
| Stock Based Compensation Liability Measured at Fair Value                                                                                | 0              | 0               | 0 |   |
| Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability                                                        |           | 0               |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                  |           |            |   |   |
| Impaired Oil and Gas Properties                                                                                                          |           | 0               | 0 | 0 |
| Impaired Materials and Supplies Inventory                                                                                                |           | 0               | 0 |   |
| Significant Unobservable Inputs (Level 3)                                                                                                |           |            |   |   |
| **Financial Assets**                                                                                                                     |           |            |   |   |
| Mutual Fund Investments                                                                                                                  | 0              | 0               | 0 |   |
| Commodity Derivative Instruments                                                                                                         |                | 0               |  |   |
| **Financial Liabilities**                                                                                                                |           |            |   |   |
| Commodity Derivative Instruments                                                                                                         | 0              | 0               | 0 |   |
| Stock Based Compensation Liability Measured at Fair Value                                                                                | 0              | 0               | 0 |   |
| Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability                                                        |           | 0               |   |   |
| **Asset Impairment Charges [Abstract]**                                                                                                  |           |            |   |   |
| Impaired Oil and Gas Properties                                                                                                          |           | 0               | 752 | $ 100 |
| Impaired Materials and Supplies Inventory                                                                                                |           | 91              | 61 |   |
| Adjustment                                                                                                                               |           |            |   |   |
| **Financial Assets**                                                                                                                     |           |            |   |   |
| Mutual Fund Investments                                                                                                                  | 0              | 0               | 0 |   |
| Commodity Derivative Instruments                                                                                                         | (8)            | (5)             | (8) |   |
| **Financial Liabilities**                                                                                                                |           |            |   |   |
| Commodity Derivative Instruments                                                                                                         | 8              | 5               | 8 |   |
| Stock Based Compensation Liability Measured at Fair Value                                                                                | $ 0            | 0               | $ 0 |   |
| Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability                                                        |           | $ 0             |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents a certain statement of financial position liability caption which represents a commodity derivative liability, measured at fair value on a recurring basis.
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No definition available.
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This element represents a certain statement of financial position liability caption which represents a deferred compensation liability, measured at fair value on a recurring basis.
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| - Definition
Fair Value Liabilities Measured on a Recurring Basis Stock Compensation Liability
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No definition available.
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| - Definition
Impairment Of Materials And Supply Inventory
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No definition available.
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| X                                                                                                                                                                                                                                                                        |
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Material and Supply Inventory, Net Book Value
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No definition available.
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| X                                                                                                                                                                                                                                                      |
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| - Definition
Oil and Gas Property, Net Book Value
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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. Includes assets not subject to a master netting arrangement and not elected to be offset.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Risk-free interest rate assumption used in valuing an instrument.
+ References
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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.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.
+ References
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| - Definition
Oil and gas properties, net of depletion, carried under the full cost method.
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