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FAIR VALUE MEASUREMENTS - Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value
Cash equivalents	$ 1,854	$ 2,021
Restricted cash equivalents	134	206
Long-term investments and related	1,647	1,450
Fuel hedge contracts	12	(47)
U.S. Government securities
Fair Value
Short-term investments	1,162	1,587
Corporate obligations
Fair Value
Short-term investments	857	1,614
Asset-backed securities
Fair Value
Short-term investments	86
Other fixed income securities
Fair Value
Short-term investments	65	67
Level 1
Fair Value
Cash equivalents	1,854	2,021
Restricted cash equivalents	134	206
Long-term investments and related	1,342	1,305
Fuel hedge contracts	0	0
Level 1 | U.S. Government securities
Fair Value
Short-term investments	239	122
Level 1 | Corporate obligations
Fair Value
Short-term investments	0	0
Level 1 | Asset-backed securities
Fair Value
Short-term investments	0
Level 1 | 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	130	38
Fuel hedge contracts	12	(47)
Level 2 | U.S. Government securities
Fair Value
Short-term investments	923	1,465
Level 2 | Corporate obligations
Fair Value
Short-term investments	857	1,614
Level 2 | Asset-backed securities
Fair Value
Short-term investments	86
Level 2 | Other fixed income securities
Fair Value
Short-term investments	65	67
Level 3
Fair Value
Cash equivalents	0	0
Restricted cash equivalents	0	0
Long-term investments and related	175	107
Fuel hedge contracts	0	0
Level 3 | U.S. Government securities
Fair Value
Short-term investments	0	0
Level 3 | Corporate obligations
Fair Value
Short-term investments	0	0
Level 3 | Asset-backed securities
Fair Value
Short-term investments	0
Level 3 | Other fixed income securities
Fair Value
Short-term investments	$ 0	$ 0

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The aggregate value of all restricted investments.

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