FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2025

Fair Value Disclosures [Abstract]

Schedule of Assets/(Liabilities) Measured at Fair Value on a Recurring Basis

Assets/(Liabilities) Measured at Fair Value on a Recurring Basis

(in millions)	June 30, 2025		Level 1		Level 2		Level 3
Cash equivalents	$	1,864	$	1,864	$	—	$	—
Restricted cash equivalents	198		198		—		—
Long-term investments and related	3,079		2,764		179		136
Fuel hedge contracts	15		—		15		—

(in millions)	December 31, 2024		Level 1		Level 2		Level 3
Cash equivalents	$	1,619	$	1,619	$	—	$	—
Restricted cash equivalents	351		351		—		—
Long-term investments and related	2,372		2,085		160		127
Fuel hedge contracts	(17)		—		(17)		—