XML 120 R100.htm IDEA: XBRL DOCUMENT v3.19.3
Leases - Undiscounted Cash Flows to be Received Under Tolling Arrangements Accounted for as Sales-type Leases (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Lessor, Lease, Description [Line Items]  
2019 (remaining) $ 4
2020 17
2021 15
2022 15
2023 14
Thereafter 152
Total undiscounted cash flows 217
Lease receivable 119
Difference between undiscounted cash flows and discounted cash flows 98
MISSISSIPPI POWER CO  
Lessor, Lease, Description [Line Items]  
2019 (remaining) 4
2020 17
2021 15
2022 15
2023 14
Thereafter 152
Total undiscounted cash flows 217
Lease receivable 119
Difference between undiscounted cash flows and discounted cash flows $ 98