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LEASES - Lease Position (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assets    
Current operating lease assets $ 6,644 $ 7,004
Finance lease assets $ 825 $ 1,338
Finance lease asset, balance sheet Property and equipment, net of accumulated depreciation and amortization of $23,228 and $21,707 Property and equipment, net of accumulated depreciation and amortization of $23,228 and $21,707
Total lease assets $ 7,469 $ 8,342
Liabilities    
Current operating lease liabilities 763 759
Current finance lease liabilities $ 374 $ 358
Finance lease liability, current, balance sheet Current maturities of debt and finance leases Current maturities of debt and finance leases
Noncurrent operating leases $ 5,814 $ 6,468
Noncurrent finance lease liabilities $ 473 $ 1,086
Finance lease liability, noncurrent, balance sheet Debt and finance leases Debt and finance leases
Total lease liabilities $ 7,424 $ 8,671
Operating leases, weighted-average remaining lease term 12 years 13 years
Finance leases, weighted-average remaining lease term 3 years 4 years
Operating leases, weighted-average discount rate 4.28% 3.73%
Finance leases, weighted-average discount rate 3.53% 3.12%
Fleet Lease    
Assets    
Current operating lease assets $ 2,910 $ 3,420
Liabilities    
Current operating lease liabilities 551 552
Noncurrent operating leases 2,627 3,226
Operating leases, interest 165 189
Ground and Other Lease    
Assets    
Current operating lease assets 3,734 3,584
Liabilities    
Current operating lease liabilities 212 207
Noncurrent operating leases $ 3,187 $ 3,242