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v3.25.0.1

FAIR VALUE MEASUREMENTS - Narrative (Details) gal in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) gal | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cost basis | $ 1,300 |  |  |
Sales and maturities of marketable securities | 1,761 | $ 1,152 | $ 2,252 |
Net cash proceeds (payments) for fuel hedge positions |  | 29 | (130) |
Accumulated other comprehensive income (loss) | (239) | (299) | (388) | $ (262)
Interest Income [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loss expected to be reclassified | $ 5 |  |  |
Commodity Contract, Settled Through March 2025 | Derivative Instruments Not Designated as Hedges |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, volume | gal | 20 |  |  |
Commodity Contract, Settled Through September 2025 | Derivative Instruments Not Designated as Hedges |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, volume | gal | 47 |  |  |
Fuel hedge contracts - call options | Derivative Instruments Not Designated as Hedges |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative instruments |  | 11 |  |
Gain (loss) on derivative instrument | $ (10) | (62) | 93 |
Interest rate swap agreements | Derivative Instruments Designated as Hedges | Cash Flow Hedging |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative instruments | 9 | 8 |  |
Gain (loss) on derivative instrument | 7 | 8 | (2) |
Notional amount | 567 |  |  |
Increase (decrease) in derivative assets | 375 |  |  |
Accumulated other comprehensive income (loss) |  | $ (7) | $ 23 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Long-term debt | $ 876 |  |  |

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