2.2.0.25falsefalse1110 - Disclosure - Inventoriestruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) / shares USD ($) $FROM_Jan01_2010_TO_Dec31_2010http://www.sec.gov/CIK0000773910duration2010-01-01T00:00:002010-12-31T00:00:00usdPerShrDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0MMboeStandardhttp://www.anadarko.com/20101231MMboeapc0USDUSD$5false0us-gaap_InventoryDisclosureTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse004.  Inventories        The major classes of inventories, included in other current assets as of December 31, are as follows:<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 18px"><td style="width: 539px; text-align:left;border-color:#000000;min-width:539px;">millions</td><td colspan="2" style="width: 61px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:61px;">2010</td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td colspan="2" style="width: 60px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:60px;">2009</td></tr><tr style="height: 18px"><td style="width: 539px; text-align:left;border-color:#000000;min-width:539px;">Crude oil</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:10px;">$</td><td style="width: 51px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:51px;">126</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;text-align:center;border-color:#000000;min-width:10px;">$</td><td style="width: 50px; border-top-style:solid;border-top-width:1px;text-align:right;border-color:#000000;min-width:50px;">97</td></tr><tr style="height: 18px"><td style="width: 539px; text-align:left;border-color:#000000;min-width:539px;">Natural gas</td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;">64</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 10px; text-align:center;border-color:#000000;min-width:10px;"> </td><td style="width: 50px; text-align:right;border-color:#000000;min-width:50px;">94</td></tr><tr style="height: 18px"><td style="width: 539px; text-align:left;border-color:#000000;min-width:539px;">NGLs</td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"> </td><td style="width: 51px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:51px;">61</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 10px; border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;"> </td><td style="width: 50px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:50px;">45</td></tr><tr style="height: 18px"><td style="width: 539px; text-align:left;border-color:#000000;min-width:539px;">Total</td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;">$</td><td style="width: 51px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:51px;">251</td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 10px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:center;border-color:#000000;min-width:10px;">$</td><td style="width: 50px; border-top-style:solid;border-top-width:1px;border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:50px;">236</td></tr></table></div>4.  Inventories        The major classes of inventories, included in other current assets as of December 31,falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis element represents the complete disclosure related to inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 falsefalseInventories11InventoriesUnKnownUnKnownUnKnownUnKnownfalsetrue