LEASES - Operating Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease expense	$ 842	$ 852	$ 872
Variable lease expense	208	199	201
Total lease costs	1,050	1,051	1,073
Sublease income	$ 3	$ 3	$ 12