TRANSACTIONS WITH AFFILIATED COMPANIES - Narrative (Details) $ in Millions |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2026
USD ($)
extension
|
Mar. 31, 2025
USD ($)
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| ATSI | ||
| Related Party Transaction [Line Items] | ||
| Number of additional successive periods | 10 | |
| Renewal term of lease yet to be commenced | 50 years | |
| MAIT | ||
| Related Party Transaction [Line Items] | ||
| Number of additional successive periods | 2 | |
| Renewal term of lease yet to be commenced | 25 years | |
| Number of additional renewal options | 1 | |
| Additional successive term | 24 years | |
| Affiliates | ||
| Related Party Transaction [Line Items] | ||
| Defined benefit plan, plan assets, other pension and OPEB net periodic costs (credits) | $ | $ 2 | $ 3 |
| X | ||||||||||
- Definition Lessee, Operating Lease, Number Of Additional Renewal Options No definition available.
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- Definition Lessee, Operating Lease, Number Of Renewal Options No definition available.
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- Definition Lessee, Operating Lease, Renewal Term, Additional Successive Term No definition available.
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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