SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 30, 2020
Accounting Policies [Line Items]
Retained earnings	$ 31,830	$ 27,541
Long-term debt	12,223	11,985
Additional paid-in capital	(7,175)	(6,491)
Deferred income taxes	$ (258)	(685)
Online Travel Reservation Services
Accounting Policies [Line Items]
Time period from the reservation date that performance obligations are expected to be completed	one year
Accounting Standards Update 2020-06
Accounting Policies [Line Items]
Retained earnings			$ 30
Long-term debt			86
Additional paid-in capital			96
Deferred income taxes			$ 21
Convertible Senior Notes | 0.75% Senior Convertible Notes Due May 2025
Accounting Policies [Line Items]
Stated interest rate	0.75%		0.75%	0.75%
Long-term debt	$ 857	$ 854