COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Loss Contingencies [Line Items]
Special items - operating	$ 56	$ 146	$ 147	$ 180
Line of credit facility, asset restrictions, unrestricted cash and marketable securities	$ 500		500
Litigation
Loss Contingencies [Line Items]
Special items - operating			61
Virgin Group trademark license agreement
Loss Contingencies [Line Items]
Damages sought			$ 8
B 737-10 | Employee Stock Option
Loss Contingencies [Line Items]
Exercises in period (in shares)	12
B787-9 | Employee Stock Option
Loss Contingencies [Line Items]
Additions in period (in shares)	5