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LEASES - Maturities of Lease Liabilities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Operating leases:  
2020 $ 289
2021 268
2022 260
2023 208
2024 163
Thereafter 1,514
Total 2,702
Less: Present value discount 858
Operating lease obligations, including held for sale 1,844
Operating lease obligations 1,844
Finance leases:  
2020 31
2021 25
2022 22
2023 18
2024 15
Thereafter 246
Total 357
Less: Present value discount 131
Finance lease obligations 226
Alabama Power  
Operating leases:  
2020 54
2021 52
2022 53
2023 4
2024 1
Thereafter 1
Total 165
Less: Present value discount 9
Operating lease obligations 156
Finance leases:  
2020 1
2021 1
2022 1
2023 1
2024 0
Thereafter 0
Total 4
Less: Present value discount 0
Finance lease obligations 4
Georgia Power  
Operating leases:  
2020 205
2021 198
2022 197
2023 198
2024 161
Thereafter 831
Total 1,790
Less: Present value discount 364
Operating lease obligations 1,426
Finance leases:  
2020 28
2021 24
2022 25
2023 25
2024 25
Thereafter 134
Total 261
Less: Present value discount 105
Finance lease obligations 156
Mississippi Power  
Operating leases:  
2020 2
2021 1
2022 1
2023 1
2024 0
Thereafter 2
Total 7
Less: Present value discount 1
Operating lease obligations 6
Finance leases:  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total 0
Less: Present value discount
Finance lease obligations 0
Southern Power  
Operating leases:  
2020 26
2021 23
2022 23
2023 24
2024 24
Thereafter 812
Total 932
Less: Present value discount 534
Operating lease obligations 398
Finance leases:  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total 0
Less: Present value discount
Finance lease obligations 0
Southern Company Gas  
Operating leases:  
2020 18
2021 17
2022 14
2023 11
2024 10
Thereafter 44
Total 114
Less: Present value discount 22
Operating lease obligations 92
Finance leases:  
2020 0
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total 0
Less: Present value discount 0
Finance lease obligations $ 0