LEASES - Schedule of Leased Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 1,453	$ 1,400
Operating Lease, Expense	654	602	$ 668
Sublease Income	(16)	(14)	(13)
Lease, Cost	638	588	655
Aircraft Leases [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	782	750
Operating Lease, Cost	174	215	246
CPA Aircraft [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	600	579
Operating Lease, Cost	80	80	79
Airport Facilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	16	16
Operating Lease, Cost	379	288	324
Corporate real estate [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	55	55
Operating Lease, Cost	$ 21	$ 19	$ 19