LEASES - Leveraged Leases (Narrative) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) leveraged_lease project	Dec. 31, 2020 USD ($) leveraged_lease project	Dec. 31, 2019 USD ($)
Leveraged Lease [Line Items]
Number of leveraged leases | leveraged_lease			1	4
Number of domestic projects subject to leveraged lease				2
Number of international projects subject to leveraged lease				2
Number of domestic projects subject to leveraged lease sold			1
Remaining lease term			10 years
Lease, impairment loss | $	$ 154	$ 17	$ 7	$ 206	$ 0
Lease, impairment loss, after tax | $	$ 74	$ 13