| **Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions**              | 3 Months Ended | 6 Months Ended |        |
|----------------------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Derivatives, Fair Value [Line Items]**                                                           |           |           |   |   |   |
| Derivative Asset, Fair Value                                                                       | $ 556          |           | $ 556  |   | $ 890 |
| Derivative Liability, Fair Value                                                                   | 0              |           | 0      |   | 0 |
| (Gain) Loss on Commodity Derivative Instruments                                                    | 87             | $ 236          | (63)   | $ 311 |   |
| Cash Received (Paid) In Settlement Of Derivative Instruments Not Designated As Hedging Instruments | 187            | (49)           | 397    | (83) |   |
| Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments                                | 274            | 187            | 334    | 228 |   |
| (Gain) Loss on Commodity Derivative Instruments                                                    | 87             | 236            | (63)   | 311 |   |
| Current Liabilities                                                                                |           |           |   |   |   |
| **Derivatives, Fair Value [Line Items]**                                                           |           |           |   |   |   |
| Derivative Asset, Fair Value                                                                       | 456            |           | 456    |   | 710 |
| Derivative Liability, Fair Value                                                                   | 0              |           | 0      |   | 0 |
| Noncurrent Liabilities                                                                             |           |           |   |   |   |
| **Derivatives, Fair Value [Line Items]**                                                           |           |           |   |   |   |
| Derivative Asset, Fair Value                                                                       | 100            |           | 100    |   | 180 |
| Derivative Liability, Fair Value                                                                   | 0              |           | 0      |   | $ 0 |
| Crude Oil [Member]                                                                                 |           |           |   |   |   |
| **Derivatives, Fair Value [Line Items]**                                                           |           |           |   |   |   |
| (Gain) Loss on Commodity Derivative Instruments                                                    | (157)          | 46             | (342)  | 73 |   |
| Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments                                | 242            | 192            | 297    | 219 |   |
| (Gain) Loss on Commodity Derivative Instruments                                                    | 85             | 238            | (45)   | 292 |   |
| Natural Gas [Member]                                                                               |           |           |   |   |   |
| **Derivatives, Fair Value [Line Items]**                                                           |           |           |   |   |   |
| (Gain) Loss on Commodity Derivative Instruments                                                    | (30)           | 3              | (55)   | 10 |   |
| Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments                                | 32             | (5)            | 37     | 9 |   |
| (Gain) Loss on Commodity Derivative Instruments                                                    | $ 2            | $ (2)          | $ (18) | $ 19 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, before 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.
+ References
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| X                                                                                                                                                     |
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| X                                                                                                                                                       |
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| X                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
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