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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Inventory by category |  |
Inventory | $ 1,031 | $ 1,209
Linefill and base gas | 704 | 707
Long-term inventory | 244 | 274
Total | 1,979 | 2,190
Inventory-related disclosures |  |
Ratio of Mcf of natural gas to crude Btu | 6 | 6
Crude oil |  |
Inventory by category |  |
Inventory | 780 | 737
Linefill and base gas | 582 | 583
Long-term inventory | 155 | 149
Inventory, Volumes (in barrels or in Mcf) | 9,173,000 | 9,492,000
Linefill and base gas, Volumes (in barrels or in Mcf) | 9,946,000 | 9,919,000
Long-term inventory, Volumes (in barrels or Mcf) | 2,035,000 | 1,962,000
Inventory, Price/Unit of measure (in dollars per unit) | 85.03 | 77.64
Linefill and base gas, Price/Unit of measure (in dollars per unit) | 58.52 | 58.78
Long-term inventory, Price/Unit of measure (in dollars per unit) | 76.17 | 75.94
NGL |  |
Inventory by category |  |
Inventory | 132 | 388
Linefill and base gas | 68 | 70
Long-term inventory | 89 | 125
Inventory, Volumes (in barrels or in Mcf) | 2,974,000 | 9,472,000
Linefill and base gas, Volumes (in barrels or in Mcf) | 1,400,000 | 1,400,000
Long-term inventory, Volumes (in barrels or Mcf) | 2,221,000 | 3,238,000
Inventory, Price/Unit of measure (in dollars per unit) | 44.38 | 40.96
Linefill and base gas, Price/Unit of measure (in dollars per unit) | 48.57 | 50.00
Long-term inventory, Price/Unit of measure (in dollars per unit) | 40.07 | 38.60
Natural gas |  |
Inventory by category |  |
Inventory | 88 | 60
Linefill and base gas | 54 | 54
Inventory, Volumes (in barrels or in Mcf) | 26,452,000 | 20,374,000
Linefill and base gas, Volumes (in barrels or in Mcf) | 15,755,000 | 15,755,000
Inventory, Price/Unit of measure (in dollars per unit) | 3.33 | 2.94
Linefill and base gas, Price/Unit of measure (in dollars per unit) | 3.43 | 3.43
Inventory-related disclosures |  |
Number used to divide into natural gas volumes to convert to barrels | 6 | 6
Other |  |
Inventory by category |  |
Inventory | $ 31 | $ 24

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- Definition The weighted-average price per unit of current inventory. + References No definition available. + Details
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- Definition Crude oil, refined products, and NGL linefill in pipelines and base gas 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 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 -Section A -Paragraph 4, 5 -Chapter 3 -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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph d -Article 5 + Details
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