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Reorganization under Chapter 11 of the United States Bankruptcy Code - Additional Information (Detail) (USD $) In Billions, unless otherwise specified | Mar. 23, 2012 | Sep. 25, 2008
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Emergence From Chapter Eleven [Line Items] |  |
Assets sold of WMB in exchange for payment |  | $ 1.88
Amount of cash and other assets distributed by trust under plan | $ 6.5 |

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- Definition Amount of reorganization value related to estimated net realizable value of asset dispositions. Reorganization value is the amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 05 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6458260&loc=d3e54813-112758 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6585303&loc=d3e56239-112766 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 90-7 -Paragraph 37, 38, 68 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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- Definition Amount of cash and other assets distributed by trust under plan. + References No definition available. + Details
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