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Leases (Future Minimum Operating Lease Payments, Excluding Contingent Rentals) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 5
2020 5
2021 3
2022 3
2023 2
Thereafter 12
Total future minimum operating lease payments, excluding contingent rentals 30
IPL [Member]  
Operating Leased Assets [Line Items]  
2019 3
2020 2
2021 2
2022 2
2023 2
Thereafter 12
Total future minimum operating lease payments, excluding contingent rentals 23
WPL [Member]  
Operating Leased Assets [Line Items]  
2019 2
2020 3
2021 1
2022 0
2023 0
Thereafter 0
Total future minimum operating lease payments, excluding contingent rentals $ 6