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Leases - Undiscounted Cash Flows to be Received Under Tolling Arrangements Accounted for as Sales-type Leases (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Lessor, Lease, Description [Line Items]  
2019 (remaining) $ 11
2020 14
2021 14
2022 13
2023 12
Thereafter 135
Total undiscounted cash flows 199
Lease receivable 108
Difference between undiscounted cash flows and discounted cash flows 91
MISSISSIPPI POWER CO  
Lessor, Lease, Description [Line Items]  
2019 (remaining) 11
2020 14
2021 14
2022 13
2023 12
Thereafter 135
Total undiscounted cash flows 199
Lease receivable 108
Difference between undiscounted cash flows and discounted cash flows $ 91