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FAIR VALUE MEASUREMENTS - Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative liabilities |  |
Cash held - offsetting derivative net asset positions under master-netting arrangements |  | $ 0
Cash posted - total | $ (41) | $ 9
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other current assets
Fair Value, Recurring |  |
Derivative assets |  |
Derivative assets netting | (125) | $ (125)
Derivative assets | 52 | 53
Derivative liabilities |  |
Derivative liabilities netting | 84 | 125
Derivative liabilities | 0 | 0
Fair Value, Recurring | Commodity contracts |  |
Derivative assets |  |
Derivative assets netting | (125) | (125)
Derivative assets | 52 | 42
Derivative liabilities |  |
Derivative liabilities netting | 84 | 125
Derivative liabilities | 0 | 0
Fair Value, Recurring | Interest-rate contracts |  |
Derivative assets |  |
Derivative assets netting |  | 0
Interest-rate contracts |  | 11
Fair Value, Recurring | Fair Value, Inputs, Level 1 |  |
Derivative assets |  |
Derivative asset, fair value, gross | 109 | 15
Derivative liabilities |  |
Derivative liability, fair value, gross | (40) | (38)
Fair Value, Recurring | Fair Value, Inputs, Level 1 | Commodity contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 109 | 15
Derivative liabilities |  |
Derivative liability, fair value, gross | (40) | (38)
Fair Value, Recurring | Fair Value, Inputs, Level 1 | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 0
Fair Value, Recurring | Fair Value, Inputs, Level 2 |  |
Derivative assets |  |
Derivative asset, fair value, gross | 68 | 163
Derivative liabilities |  |
Derivative liability, fair value, gross | (44) | (87)
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Commodity contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 68 | 152
Derivative liabilities |  |
Derivative liability, fair value, gross | (44) | (87)
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 11
Fair Value, Recurring | Fair Value, Inputs, Level 3 |  |
Derivative assets |  |
Derivative asset, fair value, gross | 0 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | 0 | 0
Fair Value, Recurring | Fair Value, Inputs, Level 3 | Commodity contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 0 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | 0 | 0
Fair Value, Recurring | Fair Value, Inputs, Level 3 | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 0
Fair Value, Recurring | Gross Fair Value Measurement |  |
Derivative assets |  |
Derivative asset, fair value, gross | 177 | 178
Derivative liabilities |  |
Derivative liability, fair value, gross | (84) | (125)
Fair Value, Recurring | Gross Fair Value Measurement | Commodity contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 177 | 167
Derivative liabilities |  |
Derivative liability, fair value, gross | $ (84) | (125)
Fair Value, Recurring | Gross Fair Value Measurement | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | $ 11

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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
Name: | us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oke_FinancialContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |