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FAIR VALUE - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Swap asset | $ 117,000,000 | $ 68,000,000
Interest Rate Swap |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cumulative, aggregate adjustment | 117,000,000 |
Put option |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of financial liability | 742,000,000 | 595,000,000
Call option |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of financial asset | 24,000,000 | 18,000,000
Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term debt | 0 | 871,000,000
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt outstanding | 13,000,000,000.0 | 10,800,000,000
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt outstanding | 12,900,000,000 | 10,600,000,000
Recurring Basis |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total invested assets | 24,735,000,000 |
Unobservable Inputs (Level 3) | Recurring Basis |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total invested assets | $ 291,000,000 | $ 218,000,000
Investments | Fair Value Risk | Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk (percent) | 1.20% | 1.00%

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