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FAIR VALUE MEASUREMENTS - Fair Value Measurements on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value
Cash equivalents	$ 1,619	$ 1,545
Restricted cash equivalents	351	653
Long-term investments and related	2,372	2,867
U.S. Government securities
Fair Value
Short-term investments		859
Corporate obligations
Fair Value
Short-term investments		218
Other fixed income securities
Fair Value
Short-term investments		50
Fuel hedge contracts
Fair Value
Fuel hedge contracts	(17)	5
Level 1
Fair Value
Cash equivalents	1,619	1,545
Restricted cash equivalents	351	653
Long-term investments and related	2,085	2,614
Level 1 | U.S. Government securities
Fair Value
Short-term investments		204
Level 1 | Corporate obligations
Fair Value
Short-term investments		0
Level 1 | Other fixed income securities
Fair Value
Short-term investments		0
Level 1 | Fuel hedge contracts
Fair Value
Fuel hedge contracts	0	0
Level 2
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	160	134
Level 2 | U.S. Government securities
Fair Value
Short-term investments		655
Level 2 | Corporate obligations
Fair Value
Short-term investments		218
Level 2 | Other fixed income securities
Fair Value
Short-term investments		50
Level 2 | Fuel hedge contracts
Fair Value
Fuel hedge contracts	(17)	5
Level 3
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	127	119
Level 3 | U.S. Government securities
Fair Value
Short-term investments		0
Level 3 | Corporate obligations
Fair Value
Short-term investments		0
Level 3 | Other fixed income securities
Fair Value
Short-term investments		0
Level 3 | Fuel hedge contracts
Fair Value
Fuel hedge contracts	$ 0	$ 0

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