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EMPLOYEE BENEFIT PLANS - Narrative (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2025 | Jan. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) pensionPlan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Number of defined benefit pension plans | pensionPlan |  |  | 2 |  |
AOCI, defined benefit plan, after tax |  |  | $ (58,000,000) | $ (64,000,000) |
Annual discretionary contributions (as a percent) |  |  | 2.00% |  |
401(k) Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Percent of employee matched of eligible compensation (as a percent) |  |  | 100.00% |  |
Percentage of each participants eligible compensation (as a percent) |  |  | 6.00% |  |
Contributions made to the plan |  |  | $ 66,000,000 | 44,000,000 | $ 35,000,000
Profit-sharing contribution |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Percentage of each participants eligible compensation (as a percent) |  |  | 1.00% |  |
Profit-sharing contribution | Subsequent Event |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Percentage of each participants eligible compensation (as a percent) | 6.00% |  |  |  |
Other Postretirement Benefits Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Number of year of service (in years) |  |  | 5 years |  |
Employer contributions |  |  | $ 0 | 0 |
Benefits paid |  |  | 3,000,000 | 4,000,000 |
Retirement Pension Benefits |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  | 628,000,000 | 637,000,000 |
Employer contributions |  |  | 5,000,000 | 0 |
Benefits paid |  |  | 36,000,000 | $ 33,000,000 |
Magellan Non-Union Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 17,000,000 |  |  |
Magellan Union Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  | $ 3,000,000 |  |  |
ONEOK Defined Benefit Pension |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | 9,000,000 |  |
Other Pension Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | $ 0 |  |

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- Definition Minimum Number Of Years Of Service For Certain Employees To Be Eligible To Participate In Welfare Plans That Provide Postretirement Medical And Life Insurance Benefits + References No definition available. + Details
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