2.2.0.25falsefalse0203 - Disclosure - Other Accrualstruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Jan-01-2011_Mar-31-2011http://www.sec.gov/CIK0001324518duration2011-01-01T00:00:002011-03-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0wpz_OtherAccrualsDisclosuresAbstractwpzfalsenadurationOther Accruals Disclosures.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringOther Accruals Disclosures.falsefalseOther Accruals [Abstract]3false0wpz_OtherAccrualsDisclosuresTextBlockwpzfalsenadurationOther Accruals Disclosures.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00  <div style="font-family: 'Times New Roman',Times,serif"> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>Note 3. Other Accruals</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     <i>Other income — net </i>within <i>segment costs and expenses </i>in 2011 includes $10 million related to the reversal of project feasibility costs from expense to capital at Gas Pipeline, associated with an expansion project, upon determining that the related project was probable of development. These costs will be included in the capital costs of the project, which we belive are probable of recovery through the project rates. </div> </div>  <!-- Begin Block Tagged NotefalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringOther Accruals Disclosures.No authoritative reference available.falsefalseOther Accruals12Other AccrualsUnKnownUnKnownUnKnownUnKnownfalsetrue