ACQUISITIONS AND DISPOSITIONS - Southern Company Narrative (Details)	1 Months Ended		3 Months Ended			12 Months Ended
	Dec. 31, 2021 USD ($) project	Oct. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2022 USD ($) project	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Lease, initial impairment loss				$ 34,000,000
Lease, initial impairment loss, after tax				17,000,000
Lease, impairment loss					$ 154,000,000	$ 0	$ 7,000,000	$ 206,000,000
Lease, impairment loss, after tax					$ 74,000,000
Proceeds from sale of assets subject to leveraged lease	$ 673,000,000	$ 45,000,000
Gain (loss) on sale of assets subject to leveraged lease		0
Leveraged leases, income tax benefits		$ 16,000,000
Number of international projects subject to leveraged lease terminated | project	2					2
Gain (loss) on termination of leveraged leases	$ 93,000,000
Gain (loss) on termination of leveraged leases, after tax	$ 99,000,000
All Other
Business Acquisition [Line Items]
Lease, impairment loss			$ 7,000,000	18,000,000			7,000,000	206,000,000
Lease, impairment loss, after tax			$ 6,000,000	$ 14,000,000			$ 6,000,000	$ 105,000,000