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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 numerator denominator | Dec. 31, 2011 numerator denominator
Inventory by category |  |
Inventory | $ 1,079 | $ 978
Linefill and base gas | 577 | 564
Long-term inventory | 146 | 135
Total | 1,802 | 1,677
Inventory-related disclosures |  |
Numerator for ratio of Mcf of natural gas to crude Btu | 6 | 6
Denominator for ratio of Mcf of natural gas to crude Btu | 1 | 1
Crude oil |  |
Inventory by category |  |
Inventory | 821 | 483
Linefill and base gas | 526 | 514
Long-term inventory | 138 | 127
Inventory, Volumes (in barrels or cubic feet) | 8,464,000 | 5,361,000
Linefill and base gas, Volumes (in barrels or cubic feet) | 9,410,000 | 9,366,000
Long-term inventory, Volumes (in barrels or cubic feet) | 1,848,000 | 1,714,000
Inventory, Price/Unit of measure (in dollars per unit) | 97.00 | 90.10
Linefill and base gas, Price/Unit of measure (in dollars per unit) | 55.90 | 54.88
Long-term inventory, Price/Unit of measure (in dollars per unit) | 74.68 | 74.10
NGL |  |
Inventory by category |  |
Inventory | 216 | 438
Linefill and base gas | 2 | 2
Long-term inventory | 8 | 8
Inventory, Volumes (in barrels or cubic feet) | 3,829,000 | 6,885,000
Linefill and base gas, Volumes (in barrels or cubic feet) | 31,000 | 31,000
Long-term inventory, Volumes (in barrels or cubic feet) | 150,000 | 150,000
Inventory, Price/Unit of measure (in dollars per unit) | 56.41 | 63.62
Linefill and base gas, Price/Unit of measure (in dollars per unit) | 64.52 | 64.52
Long-term inventory, Price/Unit of measure (in dollars per unit) | 53.33 | 53.33
Natural gas |  |
Inventory by category |  |
Inventory | 33 | 51
Linefill and base gas | 49 | 48
Inventory, Volumes (in barrels or cubic feet) | 14,453,000,000 | 16,170,000,000
Linefill and base gas, Volumes (in barrels or cubic feet) | 14,105,000,000 | 14,105,000,000
Inventory, Price/Unit of measure (in dollars per unit) | 2.28 | 3.15
Linefill and base gas, Price/Unit of measure (in dollars per unit) | 3.47 | 3.40
Inventory-related disclosures |  |
Number used to divide into natural gas volumes to convert to barrels | 6 |
Other |  |
Inventory by category |  |
Inventory | $ 9 | $ 6

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- Definition Represents the number to be divided into the amount in cubic feet of natural gas volumes in order to convert the volumes to barrels. + References No definition available. + Details
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- Details
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- Definition This element represents the aggregate of current and non-current inventory. + References No definition available. + Details
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- Details
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- Definition The volume of current inventory as of the balance sheet date. + References No definition available. + Details
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- Definition The volume of linefill and base gas inventory as of the balance sheet date. + References No definition available. + Details
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- Definition The volume of noncurrent inventory as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted-average price per unit of current inventory. + References No definition available. + Details
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- Definition The weighted-average price per unit of linefill and base gas inventory. + References No definition available. + Details
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- Definition The weighted-average price per unit of noncurrent inventory. + References No definition available. + Details
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- Definition Crude oil, refined products, and LPG linefill and base gas in pipelines and natural gas storage facilities that are owned by the entity. The linefill and base gas are intended for long-term use. + References No definition available. + Details
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- Definition Represents the numerator for the minimum ratio of Mcf of natural gas to crude Btu. + References No definition available. + Details
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- Definition Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 + Details
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- Definition Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 4, 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph d -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(d)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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