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Leases - Lessor (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Lessor, Lease, Description [Line Items]    
2019 $ 3 $ 3
2020 13 13
2021 10 10
2022 4 4
2023 4 4
2024 4 4
Thereafter 12 12
Total 50 50
Operating Lease, Lease Income 6 16
LG And E And KU Energy LLC [Member]    
Lessor, Lease, Description [Line Items]    
2019 2 2
2020 7 7
2021 5 5
2022 0 0
2023 1 1
2024 0 0
Thereafter 0 0
Total 15 15
Operating Lease, Lease Income 4 10
Louisville Gas And Electric Co [Member]    
Lessor, Lease, Description [Line Items]    
2019 0 0
2020 0 0
2021 1 1
2022 0 0
2023 0 0
2024 0 0
Thereafter 0 0
Total 1 1
Operating Lease, Lease Income 2 4
Kentucky Utilities Co [Member]    
Lessor, Lease, Description [Line Items]    
2019 2 2
2020 7 7
2021 4 4
2022 0 0
2023 0 0
2024 0 0
Thereafter 0 0
Total 13 13
Operating Lease, Lease Income $ 2 $ 6