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Leases - Lessor (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lessor, Lease, Description [Line Items]    
2019 $ 7 $ 7
2020 13 13
2021 11 11
2022 4 4
2023 4 4
2024 4 4
Thereafter 12 12
Total 55 55
Operating Lease, Lease Income 6 9
LG And E And KU Energy LLC [Member]    
Lessor, Lease, Description [Line Items]    
2019 4 4
2020 7 7
2021 6 6
2022 0 0
2023 1 1
2024 0 0
Thereafter 0 0
Total 18 18
Operating Lease, Lease Income 4 6
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 2
Kentucky Utilities Co [Member]    
Lessor, Lease, Description [Line Items]    
2019 4 4
2020 7 7
2021 5 5
2022 0 0
2023 0 0
2024 0 0
Thereafter 0 0
Total 16 16
Operating Lease, Lease Income $ 2 $ 4