| **Summary of Significant Accounting Policies (Details) (USD $)In Millions, unless otherwise specified** | 1 Months Ended                                            | 12 Months Ended                         |
|---------------------------------------------------------------------------------------------------------|-----------------------------------------------------------|-----------------------------------------|
||
| **Property, Plant and Equipment [Line Items]**                                                          |                                                      |                                    |   |   |
| Total capitalized interest                                                                              |                                                      | $ (116)us-gaap_InterestCostsCapitalized | $ (121)us-gaap_InterestCostsCapitalized | $ (151)us-gaap_InterestCostsCapitalized |
| **Goodwill and Intangible Asset Impairment [Abstract]**                                                 |                                                      |                                    |   |   |
| Goodwill Impairment Indicated at Year End                                                               |                                                      | $ 0us-gaap_GoodwillImpairmentLoss       |   |   |
| **Common Stock Split [Abstract]**                                                                       |                                                      |                                    |   |   |
| Two-for-One Stock Split                                                                                 | 2us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 |                                    |   |   |
| Minimum                                                                                                 |                                                      |                                    |   |   |
| **Property, Plant and Equipment [Line Items]**                                                          |                                                      |                                    |   |   |
| Useful lives of gathering facilitates and processing plants (in years)                                  |                                                      | 3 years                                 |   |   |
| Useful lives of other property (in years)                                                               |                                                      | 3 years                                 |   |   |
| Maximum                                                                                                 |                                                      |                                    |   |   |
| **Property, Plant and Equipment [Line Items]**                                                          |                                                      |                                    |   |   |
| Useful lives of gathering facilitates and processing plants (in years)                                  |                                                      | 30 years                                |   |   |
| Useful lives of other property (in years)                                                               |                                                      | 30 years                                |   |   |

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| - Definition
The useful life of long lived, physical assets used in the normal conduct of business, such as automobiles, trucks, airplanes, office furniture, computer equipment and other fixed assets such as building and leasehold improvements.
+ References
No definition available.
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| - Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
Reference 1: 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=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267
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| - Definition
Amount of interest capitalized during the period.
+ References
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| - Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
+ References
No definition available.
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| - Definition
Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.
+ References
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