Name:	oke_DefinedBenefitPlanTargetAllocationPercentageOfAssetsHedgeFunds
Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation percentage in long duration fixed income securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oke_DefinedBenefitPlanTargetAllocationPercentageOfAssetsLongDurationFixedIncome
Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation percentage in global real estate investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oke_DefinedBenefitPlanTargetAllocationPercentageOfAssetsRealEstate
Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation percentage in return-seeking credit securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oke_DefinedBenefitPlanTargetAllocationPercentageOfAssetsReturnSeekingCredit
Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation percentage to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oke_DefinedBenefitPlanTargetAllocationPercentageOfAssetsTotal
Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

Target allocation percentage in domestic and international equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

No definition available.

Name:	oke_DefinedBenefitPlanTargetAllocationPercentageofAssetsDomesticandInternationalEquities
Namespace Prefix:	oke_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1