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LEASES - Undiscounted Cash Flows to be Received Under PPAs Accounted for as Operating Leases (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Lessor, Lease, Description [Line Items]  
2020 $ 155
2021 141
2022 125
2023 110
2024 103
Thereafter 1,063
Total 1,697
Alabama Power  
Lessor, Lease, Description [Line Items]  
2020 26
2021 23
2022 16
2023 7
2024 3
Thereafter 20
Total 95
Georgia Power  
Lessor, Lease, Description [Line Items]  
2020 26
2021 19
2022 8
2023 2
2024 0
Thereafter 0
Total 55
Southern Power  
Lessor, Lease, Description [Line Items]  
2020 84
2021 86
2022 87
2023 88
2024 90
Thereafter 387
Total 822
Southern Company Gas  
Lessor, Lease, Description [Line Items]  
2020 35
2021 35
2022 35
2023 34
2024 33
Thereafter 463
Total $ 635