Consolidation, Consideration Transferred, Equity Interest, Share Issued, Value

No definition available.

Name:	oke_ConsolidationConsiderationTransferredEquityInterestShareIssuedValue
Namespace Prefix:	oke_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Consolidation, Equity Interest Issued or Issuable, Number of Shares

+ References

No definition available.

+ Details

Name:	oke_ConsolidationEquityInterestIssuedOrIssuableNumberOfShares
Namespace Prefix:	oke_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Noncontrolling Interest, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share

+ References

No definition available.

+ Details

Name:	oke_NoncontrollingInterestConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare
Namespace Prefix:	oke_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

Name:	srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- 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

No definition available.

+ Details

Name:	us-gaap_OptionIndexedToIssuersEquityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	oke_NoncontrollingInterestAcquisitionAxis=oke_DelawareBasinJVAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	oke_NoncontrollingInterestAcquisitionAxis=oke_EnLinkAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=oke_MBTCPipelineLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

EQUITY (Details) $ / shares in Units, shares in Millions, $ in Millions				1 Months Ended	3 Months Ended						9 Months Ended
	May 28, 2025 USD ($) shares	Feb. 04, 2025	Jan. 31, 2025 USD ($) shares	Oct. 29, 2025 $ / shares	Sep. 30, 2025 USD ($) $ / shares	Jun. 30, 2025 $ / shares	Mar. 31, 2025 USD ($) $ / shares	Sep. 30, 2024 $ / shares	Jun. 30, 2024 $ / shares	Mar. 31, 2024 $ / shares	Sep. 30, 2025 USD ($)
Option Indexed to Issuer's Equity [Line Items]
Share repurchase, authorized amount					$ 2,000						$ 2,000
Repurchase of common stock					$ 45		$ 17				$ 62
Common stock dividends (in dollars per share) \| $ / shares					$ 1.03	$ 1.03	$ 1.03	$ 0.99	$ 0.99	$ 0.99
Subsequent Event
Option Indexed to Issuer's Equity [Line Items]
Common stock, dividends, declared (in dollars per share) \| $ / shares				$ 1.03
Delaware Basin JV Acquisition
Option Indexed to Issuer's Equity [Line Items]
Consolidation, shares issued (in shares) \| shares	4.9
Consolidation, shares issued, value	$ 391
EnLink Acquisition
Option Indexed to Issuer's Equity [Line Items]
Consolidation, shares issued (in shares) \| shares			41.0
Consolidation, shares issued, value			$ 4,000
Exchange ratio per Magellan unit			0.1412
MBTC Pipeline
Option Indexed to Issuer's Equity [Line Items]
Ownership percentage in variable interest entity		80.00%