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FAIR VALUE MEASUREMENTS - Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value
Cash equivalents	$ 2,718	$ 1,545
Restricted cash equivalents	316	653
Long-term investments and related	2,723	2,867
Fuel hedge contracts	1	5
U.S. Government securities
Fair Value
Short-term investments		859
Corporate obligations
Fair Value
Short-term investments		218
Short-term investments - Other fixed income securities
Fair Value
Short-term investments	8	50
Level 1
Fair Value
Cash equivalents	2,718	1,545
Restricted cash equivalents	316	653
Long-term investments and related	2,460	2,614
Fuel hedge contracts	0	0
Level 1 | U.S. Government securities
Fair Value
Short-term investments		204
Level 1 | Corporate obligations
Fair Value
Short-term investments		0
Level 1 | Short-term investments - Other fixed income securities
Fair Value
Short-term investments	0	0
Level 2
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	149	134
Fuel hedge contracts	1	5
Level 2 | U.S. Government securities
Fair Value
Short-term investments		655
Level 2 | Corporate obligations
Fair Value
Short-term investments		218
Level 2 | Short-term investments - Other fixed income securities
Fair Value
Short-term investments	8	50
Level 3
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	114	119
Fuel hedge contracts	0	0
Level 3 | U.S. Government securities
Fair Value
Short-term investments		0
Level 3 | Corporate obligations
Fair Value
Short-term investments		0
Level 3 | Short-term investments - Other fixed income securities
Fair Value
Short-term investments	$ 0	$ 0

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