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Other Income, Net (Tables)
6 Months Ended
Jun. 30, 2020
Other Income and Expenses [Abstract]  
Schedule of Other Income, Net
Quarter endedYear-to-Date
June 30June 30
($ millions)2020  2019  2020  2019  
Equity component, allowance for funds used during construction
21  19  35  37  
Derivative gains11   —  13  
Interest income    
Gain on repayment of debt—  11  —  11  
Other12   13  12  
47  43  56  81