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    <link:label id="lab_us-gaap_CommercialPaperMember_B90FC253E99860A5F85C9184D33F5F7E_terseLabel_en-US" xlink:label="lab_us-gaap_CommercialPaperMember_B90FC253E99860A5F85C9184D33F5F7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial Paper [Member]</link:label>
    <link:label id="lab_us-gaap_CommercialPaperMember_B90FC253E99860A5F85C9184D33F5F7E_label_en-US" xlink:label="lab_us-gaap_CommercialPaperMember_B90FC253E99860A5F85C9184D33F5F7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Paper [Member]</link:label>
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    <link:loc xlink:href="wpz-20180331.xsd#wpz_LettersOfCreditUnderCertainBilateralBankAgreementsMember" xlink:label="loc_wpz_LettersOfCreditUnderCertainBilateralBankAgreementsMember_689536CF4573741674AF9184D33FC7D5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_E552B535A6A0529EB0639184D33F535D_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_E552B535A6A0529EB0639184D33F535D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_E552B535A6A0529EB0639184D33F535D" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_EAC4C048552230D7F00B9184D33FF02C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LineOfCredit_684D1B468AABA6B9B28F9184D33FA2E0_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_684D1B468AABA6B9B28F9184D33FA2E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentDomain_290CD371BA8A9277DAE6040E4EF6998F" xlink:to="lab_us-gaap_SegmentDomain_290CD371BA8A9277DAE6040E4EF6998F" xlink:type="arc" />
    <link:label id="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059_verboseLabel_en-US" xlink:label="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Northeast G&amp;P [Member]</link:label>
    <link:label id="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059_label_en-US" xlink:label="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Northeast G And P [Member]</link:label>
    <link:label id="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059_documentation_en-US" xlink:label="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_NortheastGAndPMember" xlink:label="loc_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059" xlink:to="lab_wpz_NortheastGAndPMember_AFEB1F0BA1F419983861040E4EF6D059" xlink:type="arc" />
    <link:label id="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150_verboseLabel_en-US" xlink:label="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Atlantic-Gulf [Member]</link:label>
    <link:label id="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150_label_en-US" xlink:label="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Atlantic Gulf [Member]</link:label>
    <link:label id="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150_documentation_en-US" xlink:label="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_AtlanticGulfMember" xlink:label="loc_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150" xlink:to="lab_wpz_AtlanticGulfMember_804A80FDBFCBFF4935C7040E4EF6B150" xlink:type="arc" />
    <link:label id="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C_terseLabel_en-US" xlink:label="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">West [Member]</link:label>
    <link:label id="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C_label_en-US" xlink:label="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">West [Member]</link:label>
    <link:label id="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C_documentation_en-US" xlink:label="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_WestMember" xlink:label="loc_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C" xlink:to="lab_wpz_WestMember_281952393FFE2F29959F040E4EF6EB2C" xlink:type="arc" />
    <link:label id="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC_verboseLabel_en-US" xlink:label="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">NGL &amp; Petchem Services [Member]</link:label>
    <link:label id="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC_label_en-US" xlink:label="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">NGL And Petchem Services [Member]</link:label>
    <link:label id="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC_documentation_en-US" xlink:label="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">NGL and Petchem Services segment</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_NglAndPetchemServicesMember" xlink:label="loc_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC" xlink:to="lab_wpz_NglAndPetchemServicesMember_1C662A0808E9A3D0096B040E4EF742EC" xlink:type="arc" />
    <link:label id="lab_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396_terseLabel_en-US" xlink:label="lab_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
    <link:label id="lab_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396_label_en-US" xlink:label="lab_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate and Other [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="loc_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396" xlink:to="lab_us-gaap_CorporateAndOtherMember_50B9B231A4CB97AEF6F6040E4EF7B396" xlink:type="arc" />
    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_6952C928A41EF1A7D7F4040E4EF7A8AF_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_6952C928A41EF1A7D7F4040E4EF7A8AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:label id="lab_us-gaap_SegmentReportingInformationLineItems_6952C928A41EF1A7D7F4040E4EF7A8AF_label_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_6952C928A41EF1A7D7F4040E4EF7A8AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment Reporting Information [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_6952C928A41EF1A7D7F4040E4EF7A8AF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevenuesAbstract_07C6945A1B7150C7DE2B040E4EF7EEAD_terseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_07C6945A1B7150C7DE2B040E4EF7EEAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment revenues [Line Items]</link:label>
    <link:label id="lab_us-gaap_RevenuesAbstract_07C6945A1B7150C7DE2B040E4EF7EEAD_label_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_07C6945A1B7150C7DE2B040E4EF7EEAD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenues [Abstract]</link:label>
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    <link:label id="lab_us-gaap_SalesRevenueServicesNet_935EFBAE10ADD01ABF52040E4EF77E3C_verboseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueServicesNet_935EFBAE10ADD01ABF52040E4EF77E3C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Service revenues</link:label>
    <link:label id="lab_us-gaap_SalesRevenueServicesNet_935EFBAE10ADD01ABF52040E4EF77E3C_label_en-US" xlink:label="lab_us-gaap_SalesRevenueServicesNet_935EFBAE10ADD01ABF52040E4EF77E3C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales Revenue, Services, Net</link:label>
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    <link:label id="lab_wpz_Salesrevenueservicescommodityconsideration_50C25D0738CCCCEA6C70040E4EFC4DCD_label_en-US" xlink:label="lab_wpz_Salesrevenueservicescommodityconsideration_50C25D0738CCCCEA6C70040E4EFC4DCD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sales revenue services commodity consideration</link:label>
    <link:label id="lab_wpz_Salesrevenueservicescommodityconsideration_50C25D0738CCCCEA6C70040E4EFC4DCD_documentation_en-US" xlink:label="lab_wpz_Salesrevenueservicescommodityconsideration_50C25D0738CCCCEA6C70040E4EFC4DCD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sales revenue services commodity consideration</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_Salesrevenueservicescommodityconsideration" xlink:label="loc_wpz_Salesrevenueservicescommodityconsideration_50C25D0738CCCCEA6C70040E4EFC4DCD" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SalesRevenueGoodsNet_C541C3DFB7CA082A49CA040E4EFC56A4_verboseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueGoodsNet_C541C3DFB7CA082A49CA040E4EFC56A4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Product sales</link:label>
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    <link:label id="lab_us-gaap_Revenues_2637CFA956AA816A9577040E4EFC2EA5_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_2637CFA956AA816A9577040E4EFC2EA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total revenues</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_2637CFA956AA816A9577040E4EFC2EA5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_2637CFA956AA816A9577040E4EFC2EA5" xlink:to="lab_us-gaap_Revenues_2637CFA956AA816A9577040E4EFC2EA5" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementAbstract_D04FA70D8D267981574E07E5156ECFBA_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_D04FA70D8D267981574E07E5156ECFBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_D04FA70D8D267981574E07E5156ECFBA" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RevenuesAbstract_1FE92F17653B408C27BD07E5156EF72A_verboseLabel_en-US" xlink:label="lab_us-gaap_RevenuesAbstract_1FE92F17653B408C27BD07E5156EF72A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Revenues:</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_1FE92F17653B408C27BD07E5156EF72A" xlink:type="locator" />
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    <link:loc xlink:href="wpz-20180331.xsd#wpz_Salesrevenueservicescommodityconsideration" xlink:label="loc_wpz_Salesrevenueservicescommodityconsideration_5FB440BD81CDB7434E8B07E5156F39F9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_69FA0AED41D95EF49D2E0236FBC6ADE2_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_69FA0AED41D95EF49D2E0236FBC6ADE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
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    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_D264CD43070BA58656D70236FBC69906_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_D264CD43070BA58656D70236FBC69906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesAbstract_B06588E7EEDFC0E413500236FBC6B539_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract_B06588E7EEDFC0E413500236FBC6B539" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_6691DEFBA7EBADE0536A0236FBC6A8BB_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_6691DEFBA7EBADE0536A0236FBC6A8BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AccountsPayableCurrentAbstract_2C5DFE0CCFCC42D3C12C0236FBC63D4E_verboseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrentAbstract_2C5DFE0CCFCC42D3C12C0236FBC63D4E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable:</link:label>
    <link:label id="lab_us-gaap_AccountsPayableCurrentAbstract_2C5DFE0CCFCC42D3C12C0236FBC63D4E_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrentAbstract_2C5DFE0CCFCC42D3C12C0236FBC63D4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Current [Abstract]</link:label>
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    <link:label id="lab_us-gaap_AccountsPayableTradeCurrent_FDF35C928C200F1CBC710236FBC62B80_label_en-US" xlink:label="lab_us-gaap_AccountsPayableTradeCurrent_FDF35C928C200F1CBC710236FBC62B80" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Trade, Current</link:label>
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    <link:label id="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_3D40A86D3F28AAD0F07B0236FBC6F616_label_en-US" xlink:label="lab_us-gaap_AccountsPayableRelatedPartiesCurrent_3D40A86D3F28AAD0F07B0236FBC6F616" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Related Parties, Current</link:label>
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    <link:label id="lab_us-gaap_InterestPayableCurrent_A779AA76606CE47BEDF00236FBC6E4F0_label_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_A779AA76606CE47BEDF00236FBC6E4F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Payable, Current</link:label>
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    <link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_34912D2DD139A8FD7A870236FBC62A3C_verboseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_34912D2DD139A8FD7A870236FBC62A3C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other accrued liabilities</link:label>
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    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt and Capital Lease Obligations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7" xlink:to="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_A80567BEC20EC14579760236FBC7E8C7" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationsNoncurrent_8632648FDF754E1527260236FBC7CC05_verboseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsNoncurrent_8632648FDF754E1527260236FBC7CC05" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationsNoncurrent_8632648FDF754E1527260236FBC7CC05_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationsNoncurrent_8632648FDF754E1527260236FBC7CC05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligations, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_00B4EC6FFC459CD4D85A0236FBC746C4_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesNoncurrent_00B4EC6FFC459CD4D85A0236FBC746C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Tax Liabilities, Net, Noncurrent</link:label>
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    <link:label id="lab_us-gaap_OtherLiabilitiesAndDeferredRevenueNoncurrent_A22953277385FBB69F740236FBC7C059_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesAndDeferredRevenueNoncurrent_A22953277385FBB69F740236FBC7C059" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities and Deferred Revenue, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLiabilitiesAndDeferredRevenueNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesAndDeferredRevenueNoncurrent_A22953277385FBB69F740236FBC7C059" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CommitmentsAndContingencies_B8D149423FA796AF34090236FBC7958A_verboseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_B8D149423FA796AF34090236FBC7958A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Contingent liabilities (Note 9)</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingencies_B8D149423FA796AF34090236FBC7958A_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingencies_B8D149423FA796AF34090236FBC7958A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies</link:label>
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    <link:label id="lab_us-gaap_PartnersCapitalAbstract_1B2D633143645AF76CEE0236FBC7B13A_verboseLabel_en-US" xlink:label="lab_us-gaap_PartnersCapitalAbstract_1B2D633143645AF76CEE0236FBC7B13A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Partners&#8217; equity:</link:label>
    <link:label id="lab_us-gaap_PartnersCapitalAbstract_1B2D633143645AF76CEE0236FBC7B13A_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAbstract_1B2D633143645AF76CEE0236FBC7B13A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PartnersCapitalAbstract" xlink:label="loc_us-gaap_PartnersCapitalAbstract_1B2D633143645AF76CEE0236FBC7B13A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LimitedPartnersCapitalAccount_75686BA335AE0107139A0236FBC7BFD3_verboseLabel_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccount_75686BA335AE0107139A0236FBC7BFD3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common units (957,529,465 and 956,952,542 units outstanding at March 31, 2018 and December 31, 2017, respectively)</link:label>
    <link:label id="lab_us-gaap_LimitedPartnersCapitalAccount_75686BA335AE0107139A0236FBC7BFD3_label_en-US" xlink:label="lab_us-gaap_LimitedPartnersCapitalAccount_75686BA335AE0107139A0236FBC7BFD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Limited Partners' Capital Account</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LimitedPartnersCapitalAccount" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_75686BA335AE0107139A0236FBC7BFD3" xlink:type="locator" />
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    <link:label id="lab_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7_verboseLabel_en-US" xlink:label="lab_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Class B units (18,124,096 and 17,853,088 units outstanding at March 31, 2018 and December 31, 2017, respectively)</link:label>
    <link:label id="lab_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7_label_en-US" xlink:label="lab_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class B Limited Partner Capital Account</link:label>
    <link:label id="lab_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7_documentation_en-US" xlink:label="lab_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Class B Limited Partner Capital Account</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_ClassBLimitedPartnerCapitalAccount" xlink:label="loc_wpz_ClassBLimitedPartnerCapitalAccount_E7AD4ED8A63D83AC8BBE0236FBC75AC7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GeneralPartnersCapitalAccount_FBB148CA8DD66B11103A0236FBC7FA25_verboseLabel_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccount_FBB148CA8DD66B11103A0236FBC7FA25" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">General partner</link:label>
    <link:label id="lab_us-gaap_GeneralPartnersCapitalAccount_FBB148CA8DD66B11103A0236FBC7FA25_label_en-US" xlink:label="lab_us-gaap_GeneralPartnersCapitalAccount_FBB148CA8DD66B11103A0236FBC7FA25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">General Partners' Capital Account</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GeneralPartnersCapitalAccount" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount_FBB148CA8DD66B11103A0236FBC7FA25" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D812108C4C83978BF5730236FBC7765D_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D812108C4C83978BF5730236FBC7765D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accumulated other comprehensive income (loss)</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D812108C4C83978BF5730236FBC7765D_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D812108C4C83978BF5730236FBC7765D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_D812108C4C83978BF5730236FBC7765D" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PartnersCapital_B004B3E55EBDB98E2FEC0236FBC72E66_totalLabel_en-US" xlink:label="lab_us-gaap_PartnersCapital_B004B3E55EBDB98E2FEC0236FBC72E66" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total partners&#8217; equity</link:label>
    <link:label id="lab_us-gaap_PartnersCapital_B004B3E55EBDB98E2FEC0236FBC72E66_label_en-US" xlink:label="lab_us-gaap_PartnersCapital_B004B3E55EBDB98E2FEC0236FBC72E66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PartnersCapital" xlink:label="loc_us-gaap_PartnersCapital_B004B3E55EBDB98E2FEC0236FBC72E66" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_4707D4CCA0E911F6C5DA0236FBC7B1D6_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_4707D4CCA0E911F6C5DA0236FBC7B1D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PartnersCapitalAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_4707D4CCA0E911F6C5DA0236FBC7B1D6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_26775AE24664849427E90236FBC79F34_label_en-US" xlink:label="lab_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_26775AE24664849427E90236FBC79F34" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Partners' Capital, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_26775AE24664849427E90236FBC79F34" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_B28A67D39E0A5392285E0236FBC876B7_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_B28A67D39E0A5392285E0236FBC876B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity</link:label>
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    <link:label id="lab_wpz_ContributionToGulfstreamForRepaymentOfDebt1_7873E0D4ED63A5E3D5CDE3CA22E071BC_negatedTerseLabel_en-US" xlink:label="lab_wpz_ContributionToGulfstreamForRepaymentOfDebt1_7873E0D4ED63A5E3D5CDE3CA22E071BC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Contribution to Gulfstream for repayment of debt</link:label>
    <link:label id="lab_wpz_ContributionToGulfstreamForRepaymentOfDebt1_7873E0D4ED63A5E3D5CDE3CA22E071BC_label_en-US" xlink:label="lab_wpz_ContributionToGulfstreamForRepaymentOfDebt1_7873E0D4ED63A5E3D5CDE3CA22E071BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contribution To Gulfstream For Repayment Of Debt1</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_CD594045979FE191CA48E3CA22E1A43D_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_CD594045979FE191CA48E3CA22E1A43D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other &#8211; net</link:label>
    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_CD594045979FE191CA48E3CA22E1A43D_label_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_CD594045979FE191CA48E3CA22E1A43D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from (Payments for) Other Financing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_34495D9A289FBF800970E3CA22E1475D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_34495D9A289FBF800970E3CA22E1475D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A7B2911CB1555895DA78E3CA22E1A719_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_A7B2911CB1555895DA78E3CA22E1A719" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">INVESTING ACTIVITIES:</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7D42DB0BAAF459821158E3CA22E13148_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7D42DB0BAAF459821158E3CA22E13148" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures (1)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7D42DB0BAAF459821158E3CA22E13148" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsForProceedsFromProductiveAssets_E45C62B109A6EA510A02E3CA22E1F14B_label_en-US" xlink:label="lab_us-gaap_PaymentsForProceedsFromProductiveAssets_E45C62B109A6EA510A02E3CA22E1F14B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for (Proceeds from) Productive Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForProceedsFromProductiveAssets" xlink:label="loc_us-gaap_PaymentsForProceedsFromProductiveAssets_E45C62B109A6EA510A02E3CA22E1F14B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromContributionInAidOfConstruction_C43E093CA80B0FFCFD1CE3CA22E138C2_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromContributionInAidOfConstruction_C43E093CA80B0FFCFD1CE3CA22E138C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contributions in aid of construction</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromContributionInAidOfConstruction" xlink:label="loc_us-gaap_ProceedsFromContributionInAidOfConstruction_C43E093CA80B0FFCFD1CE3CA22E138C2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_7E35D2D3D1AF60354B10E3CA22E1E64E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_7E35D2D3D1AF60354B10E3CA22E1E64E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of businesses, net of cash divested</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_228AB233E7849C51B623E3CA22E6D722_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_228AB233E7849C51B623E3CA22E6D722" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from dispositions of equity-method investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_228AB233E7849C51B623E3CA22E6D722" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_590A7649205EEC9A12A4E3CA22E65268" xlink:type="locator" />
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    <link:label id="lab_wpz_OtherMember_A53E6BD2337821F41AAF0385796DD7E8_label_en-US" xlink:label="lab_wpz_OtherMember_A53E6BD2337821F41AAF0385796DD7E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
    <link:label id="lab_wpz_OtherMember_A53E6BD2337821F41AAF0385796DD7E8_documentation_en-US" xlink:label="lab_wpz_OtherMember_A53E6BD2337821F41AAF0385796DD7E8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
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    <link:label id="lab_us-gaap_BusinessInterruptionLossAxis_14584CB96FAE784FEB340385796D90B4_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessInterruptionLossAxis_14584CB96FAE784FEB340385796D90B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Interruption Loss [Axis]</link:label>
    <link:label id="lab_us-gaap_BusinessInterruptionLossAxis_14584CB96FAE784FEB340385796D90B4_label_en-US" xlink:label="lab_us-gaap_BusinessInterruptionLossAxis_14584CB96FAE784FEB340385796D90B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Interruption Loss [Axis]</link:label>
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    <link:label id="lab_us-gaap_BusinessInterruptionLossDomain_D3389849E21521F2C48B0385796D5746_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessInterruptionLossDomain_D3389849E21521F2C48B0385796D5746" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Interruption Loss [Domain]</link:label>
    <link:label id="lab_us-gaap_BusinessInterruptionLossDomain_D3389849E21521F2C48B0385796D5746_label_en-US" xlink:label="lab_us-gaap_BusinessInterruptionLossDomain_D3389849E21521F2C48B0385796D5746" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Interruption Loss [Domain]</link:label>
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    <link:label id="lab_wpz_GeismarIncidentMember_287E2440E4A68AEF91380385796D5823_terseLabel_en-US" xlink:label="lab_wpz_GeismarIncidentMember_287E2440E4A68AEF91380385796D5823" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Geismar Incident [Member]</link:label>
    <link:label id="lab_wpz_GeismarIncidentMember_287E2440E4A68AEF91380385796D5823_label_en-US" xlink:label="lab_wpz_GeismarIncidentMember_287E2440E4A68AEF91380385796D5823" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Geismar Incident [Member]</link:label>
    <link:label id="lab_wpz_GeismarIncidentMember_287E2440E4A68AEF91380385796D5823_documentation_en-US" xlink:label="lab_wpz_GeismarIncidentMember_287E2440E4A68AEF91380385796D5823" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
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    <link:label id="lab_us-gaap_AmortizationOfRegulatoryAsset_EFBBC09EE4FF4AE9D8950385796DA5BD_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfRegulatoryAsset_EFBBC09EE4FF4AE9D8950385796DA5BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of regulatory assets associated with asset retirement obligations</link:label>
    <link:label id="lab_us-gaap_AmortizationOfRegulatoryAsset_EFBBC09EE4FF4AE9D8950385796DA5BD_label_en-US" xlink:label="lab_us-gaap_AmortizationOfRegulatoryAsset_EFBBC09EE4FF4AE9D8950385796DA5BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Regulatory Asset</link:label>
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    <link:label id="lab_wpz_AccrualOfRegulatoryLiability_F1350EB90638B06D81160385796E6FD0_terseLabel_en-US" xlink:label="lab_wpz_AccrualOfRegulatoryLiability_F1350EB90638B06D81160385796E6FD0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrual of regulatory liability related to overcollection of certain employee expenses</link:label>
    <link:label id="lab_wpz_AccrualOfRegulatoryLiability_F1350EB90638B06D81160385796E6FD0_label_en-US" xlink:label="lab_wpz_AccrualOfRegulatoryLiability_F1350EB90638B06D81160385796E6FD0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrual Of Regulatory Liability</link:label>
    <link:label id="lab_wpz_AccrualOfRegulatoryLiability_F1350EB90638B06D81160385796E6FD0_documentation_en-US" xlink:label="lab_wpz_AccrualOfRegulatoryLiability_F1350EB90638B06D81160385796E6FD0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The expense charged against earnings during the period related to overcollection of certain employee expenses related to rate cases.</link:label>
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    <link:label id="lab_us-gaap_CostsIncurredDevelopmentCosts_40FC209DED6166E304650385796E1126_terseLabel_en-US" xlink:label="lab_us-gaap_CostsIncurredDevelopmentCosts_40FC209DED6166E304650385796E1126" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Project development costs related to Constitution (see Note 2)</link:label>
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    <link:label id="lab_us-gaap_GainLossOnContractTermination_C1C314561D8A73F18A940385796EC532_verboseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnContractTermination_C1C314561D8A73F18A940385796EC532" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Contract Termination</link:label>
    <link:label id="lab_us-gaap_GainLossOnContractTermination_C1C314561D8A73F18A940385796EC532_label_en-US" xlink:label="lab_us-gaap_GainLossOnContractTermination_C1C314561D8A73F18A940385796EC532" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gain (Loss) on Contract Termination</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_B0BC2C70F09883E2719C0385796EAE7B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_517AFF434776DAE666490385796E1D7E_negatedLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_517AFF434776DAE666490385796E1D7E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Loss on sale of Canadian operations (see Note 3)</link:label>
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    <link:label id="lab_us-gaap_LitigationSettlementAmountAwardedToOtherParty_11ABAC3C0268DD69296E0385796EBDE2_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationSettlementAmountAwardedToOtherParty_11ABAC3C0268DD69296E0385796EBDE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue adjustment associated with litigation</link:label>
    <link:label id="lab_us-gaap_LitigationSettlementAmountAwardedToOtherParty_11ABAC3C0268DD69296E0385796EBDE2_label_en-US" xlink:label="lab_us-gaap_LitigationSettlementAmountAwardedToOtherParty_11ABAC3C0268DD69296E0385796EBDE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Settlement, Amount Awarded to Other Party</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_11ABAC3C0268DD69296E0385796EBDE2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent_077F3CC08EAFC62FD5DE0385796F1462_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent_077F3CC08EAFC62FD5DE0385796F1462" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Approximate percentage of workforce reductions</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent_077F3CC08EAFC62FD5DE0385796F1462" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SeveranceCosts1_EDD963DFCEA0A912D3F10385796F453F_label_en-US" xlink:label="lab_us-gaap_SeveranceCosts1_EDD963DFCEA0A912D3F10385796F453F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Severance Costs</link:label>
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    <link:label id="lab_wpz_A6.05SeniorUnsecuredNotesdue2018Member_AB43A29C4B9C30C61573040E4FAD734E_label_en-US" xlink:label="lab_wpz_A6.05SeniorUnsecuredNotesdue2018Member_AB43A29C4B9C30C61573040E4FAD734E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">6.05% Senior Unsecured Notes due 2018 [Member]</link:label>
    <link:label id="lab_wpz_A6.05SeniorUnsecuredNotesdue2018Member_AB43A29C4B9C30C61573040E4FAD734E_documentation_en-US" xlink:label="lab_wpz_A6.05SeniorUnsecuredNotesdue2018Member_AB43A29C4B9C30C61573040E4FAD734E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">6.05% Senior Unsecured Notes due 2018 [Member]</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_A6.05SeniorUnsecuredNotesdue2018Member" xlink:label="loc_wpz_A6.05SeniorUnsecuredNotesdue2018Member_AB43A29C4B9C30C61573040E4FAD734E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017" xlink:to="lab_us-gaap_DebtInstrumentLineItems_FC901C172E1C4A2CE49F040E4FAD5017" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_8A2D1360BF6099F1AF48040E4FADE9C1_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_8A2D1360BF6099F1AF48040E4FADE9C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt face amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_8A2D1360BF6099F1AF48040E4FADE9C1_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_8A2D1360BF6099F1AF48040E4FADE9C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_8A2D1360BF6099F1AF48040E4FADE9C1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other Long-term Debt, Noncurrent</link:label>
    <link:label id="lab_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382_label_en-US" xlink:label="lab_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Long-term Debt, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherLongTermDebtNoncurrent" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382" xlink:to="lab_us-gaap_OtherLongTermDebtNoncurrent_CF87BFC8CC3573817CD9040E4FB24382" xlink:type="arc" />
    <link:label id="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A_terseLabel_en-US" xlink:label="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional interest rate accrued for default of registration rights agreements first period</link:label>
    <link:label id="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A_label_en-US" xlink:label="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod</link:label>
    <link:label id="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A_documentation_en-US" xlink:label="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the additional interest rate accrued for the first 90-day period immediately following the occurrence of default of meeting the terms and conditions of the registration rights agreements.</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod" xlink:label="loc_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A" xlink:to="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsFirstPeriod_F426DF8C183A6C2B04BC040E4FB2621A" xlink:type="arc" />
    <link:label id="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49_terseLabel_en-US" xlink:label="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional interest rate accrued for default of registration rights agreements each subsequent period</link:label>
    <link:label id="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49_label_en-US" xlink:label="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod</link:label>
    <link:label id="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49_documentation_en-US" xlink:label="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the additional interest rate accrued for each subsequent 90-day period following the initial 90-day period of default of meeting the terms and conditions of the registration rights agreements.</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod" xlink:label="loc_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49" xlink:to="lab_wpz_AdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsEachSubsequentPeriod_4CA716DB18F14E8000FD040E4FB2DC49" xlink:type="arc" />
    <link:label id="lab_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254_terseLabel_en-US" xlink:label="lab_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum additional interest rate accrued for default of registration rights agreements all periods</link:label>
    <link:label id="lab_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254_label_en-US" xlink:label="lab_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods</link:label>
    <link:label id="lab_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254_documentation_en-US" xlink:label="lab_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum interest rate accrued annually for all periods of default of meeting the terms and conditions of the registration rights agreements.</link:label>
    <link:loc xlink:href="wpz-20180331.xsd#wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods" xlink:label="loc_wpz_MaximumAdditionalInterestRateAccruedForDefaultOfRegistrationRightsAgreementsAllPeriods_028DDBE2AE26138B77A9040E4FB2B254" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08" xlink:to="lab_us-gaap_DebtInstrumentTerm_5C8E212831AFDF5C0840040E4FB2BB08" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Other Long-term Debt</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Other Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_51EA96DC539A79F4A67F040E4FB2E157" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A_verboseLabel_en-US" xlink:label="lab_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of revenues from segment to consolidated [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A_label_en-US" xlink:label="lab_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of Revenue from Segments to Consolidated [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A" xlink:to="lab_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTextBlock_DF65E4A8375475F31098D7E6D2EA022A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD_terseLabel_en-US" xlink:label="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Modified EBITDA to Net Income (Loss) [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD_label_en-US" xlink:label="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD" xlink:to="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock_F36B4C4F392E1DEDD817D7E6D2EACEBD" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009_terseLabel_en-US" xlink:label="lab_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Assets from Segment to Consolidated [Table Text Block]</link:label>
    <link:label id="lab_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009_label_en-US" xlink:label="lab_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reconciliation of Assets from Segment to Consolidated [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock" xlink:label="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009" xlink:to="lab_us-gaap_ReconciliationOfAssetsFromSegmentToConsolidatedTextBlock_B32D5E75459B9BCA9224D7E6D2EAD009" xlink:type="arc" />
    <link:label id="lab_us-gaap_ContractWithCustomerAssetNet_D06AE26A4C3C5623CAE81805DFB2B6CD_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNet_D06AE26A4C3C5623CAE81805DFB2B6CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, Net</link:label>
    <link:label id="lab_us-gaap_ContractWithCustomerAssetNet_D06AE26A4C3C5623CAE81805DFB2B6CD_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNet_D06AE26A4C3C5623CAE81805DFB2B6CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Contract with Customer, Asset, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_D06AE26A4C3C5623CAE81805DFB2B6CD" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure" xlink:label="loc_us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure_761292F08A4719CC167CDA741FC734F0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_DAB0607D7F60EAECFA43DA741FC7F675_label_en-US" xlink:label="lab_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_DAB0607D7F60EAECFA43DA741FC7F675" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down</link:label>
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    <link:label id="lab_us-gaap_AssetImpairmentCharges_794B6C437B9039AD98E2DA741FC7F27F_label_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_794B6C437B9039AD98E2DA741FC7F27F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Impairment Charges</link:label>
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    <link:label id="lab_us-gaap_TangibleAssetImpairmentCharges_CCC21759DB66962D04E7DA741FC7AA29_terseLabel_en-US" xlink:label="lab_us-gaap_TangibleAssetImpairmentCharges_CCC21759DB66962D04E7DA741FC7AA29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment of certain assets</link:label>
    <link:label id="lab_us-gaap_TangibleAssetImpairmentCharges_CCC21759DB66962D04E7DA741FC7AA29_label_en-US" xlink:label="lab_us-gaap_TangibleAssetImpairmentCharges_CCC21759DB66962D04E7DA741FC7AA29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tangible Asset Impairment Charges</link:label>
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    <link:label id="lab_us-gaap_DebtDisclosureTextBlock_9AF0711CF3C162E1C25DD7E6D200392B_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_9AF0711CF3C162E1C25DD7E6D200392B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Text Block]</link:label>
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    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_EBDECB29F36311D775DCD7E6D23E4566_verboseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_EBDECB29F36311D775DCD7E6D23E4566" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Contingent Liabilities [Text Block]</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_EBDECB29F36311D775DCD7E6D23E4566_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_EBDECB29F36311D775DCD7E6D23E4566" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</link:label>
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    <link:label id="lab_wpz_UticaEastOhioMidstreamLLCMember_A43882F9DA51AB72CD411BE7881D2305_terseLabel_en-US" xlink:label="lab_wpz_UticaEastOhioMidstreamLLCMember_A43882F9DA51AB72CD411BE7881D2305" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Utica East Ohio Midstream, LLC [Member]</link:label>
    <link:label id="lab_wpz_UticaEastOhioMidstreamLLCMember_A43882F9DA51AB72CD411BE7881D2305_label_en-US" xlink:label="lab_wpz_UticaEastOhioMidstreamLLCMember_A43882F9DA51AB72CD411BE7881D2305" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Utica East Ohio Midstream, LLC [Member]</link:label>
    <link:label id="lab_wpz_UticaEastOhioMidstreamLLCMember_A43882F9DA51AB72CD411BE7881D2305_documentation_en-US" xlink:label="lab_wpz_UticaEastOhioMidstreamLLCMember_A43882F9DA51AB72CD411BE7881D2305" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Utica East Ohio Midstream, LLC [Member]</link:label>
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    <link:label id="lab_wpz_LaurelMountainMidstreamLlcMember_7C182A390A58ADD27B251BE7881D00D3_verboseLabel_en-US" xlink:label="lab_wpz_LaurelMountainMidstreamLlcMember_7C182A390A58ADD27B251BE7881D00D3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Laurel Mountain Midstream, LLC [Member]</link:label>
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    <link:label id="lab_wpz_CaimanEnergyIiMember_D8E13AE1C6618A16F4571BE7881DB760_verboseLabel_en-US" xlink:label="lab_wpz_CaimanEnergyIiMember_D8E13AE1C6618A16F4571BE7881DB760" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Caiman Energy II, LLC [Member]</link:label>
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    <link:label id="lab_wpz_CaimanEnergyIiMember_D8E13AE1C6618A16F4571BE7881DB760_documentation_en-US" xlink:label="lab_wpz_CaimanEnergyIiMember_D8E13AE1C6618A16F4571BE7881DB760" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
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    <link:label id="lab_wpz_GulfstreamNaturalGasSystemLlcMember_538D51F87C36D018C9581BE7881D67BD_verboseLabel_en-US" xlink:label="lab_wpz_GulfstreamNaturalGasSystemLlcMember_538D51F87C36D018C9581BE7881D67BD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Gulfstream Natural Gas System, L.L.C. [Member]</link:label>
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    <link:label id="lab_wpz_DiscoveryProducerServicesLlcMember_0DB4EA06947829CD72311BE7881D02E9_terseLabel_en-US" xlink:label="lab_wpz_DiscoveryProducerServicesLlcMember_0DB4EA06947829CD72311BE7881D02E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Discovery Producer Services LLC [Member]</link:label>
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    <link:loc xlink:href="wpz-20180331.xsd#wpz_OverlandPassPipelineCompanyLlcMember" xlink:label="loc_wpz_OverlandPassPipelineCompanyLlcMember_2B282E3F841B5D65C97B1BE788235958" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_5609E7D00C378D16A9231BE78827CFA5_verboseLabel_en-US" xlink:label="lab_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_5609E7D00C378D16A9231BE78827CFA5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Parent, limited partner ownership percentage</link:label>
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    <link:label id="lab_us-gaap_Goodwill_F3F1DB65287DCF7FA2061BE7882C7E92_label_en-US" xlink:label="lab_us-gaap_Goodwill_F3F1DB65287DCF7FA2061BE7882C7E92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
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