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v3.25.1

ACQUISITIONS - Schedule of Noncash Balance Sheet Activity Related to the EnLink Acquisition (Details) - EnLink Acquisition $ in Millions | Jan. 31, 2025 USD ($)
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Business Acquisition [Line Items] |
Common stock | $ 1
Paid-in capital | 4,377
Noncontrolling interests in consolidated subsidiaries | $ (4,378)

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- Definition Noncash or Part Noncash Acquisition, Additional Paid in Capital + References No definition available. + Details
Name: | oke_NoncashOrPartNoncashAcquisitionAdditionalPaidInCapital
Namespace Prefix: | oke_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Noncash or Part Noncash Acquisition, Common Stock, Value + References No definition available. + Details
Name: | oke_NoncashOrPartNoncashAcquisitionCommonStockValue
Namespace Prefix: | oke_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-1 + Details
Name: | us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=oke_EnLinkAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |