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LEASES - Related Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Accumulated amortization | $ 477 | $ 634
Operating | 1,223 | 1,394
Finance | 125 | 297
Total lease assets | $ 1,348 | $ 1,691
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Flight equipment | Flight equipment
Current |  |
Operating | $ 208 | $ 225
Finance | $ 29 | $ 42
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Long-Term Debt and Lease Obligation, Current | Long-Term Debt and Lease Obligation, Current
Noncurrent |  |
Operating | $ 985 | $ 1,118
Finance | $ 75 | $ 147
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt less current maturities | Long-term debt less current maturities
Total lease liabilities | $ 1,297 | $ 1,532

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