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Related Parties (Tables)
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine Months Three MonthsNine Months
20252024202520242025202420252024
Corporate Services billings$50$42$147$134$49$38$144$124
Sales credited16—18—442910666
Purchases billed12413032333215185141
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2025December 31, 2024September 30, 2025December 31, 2024
Net payables to Corporate Services$142$135$71$64
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine Months
2025202420252024
ATC billings to WPL$38$39$114$115
WPL billings to ATC952012
IPL [Member]  
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine Months Three MonthsNine Months
20252024202520242025202420252024
Corporate Services billings$50$42$147$134$49$38$144$124
Sales credited16—18—442910666
Purchases billed12413032333215185141
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2025December 31, 2024September 30, 2025December 31, 2024
Net payables to Corporate Services$142$135$71$64
WPL [Member]  
Related Party Transactions [Line Items]  
Services Provided, Sales Credited And Purchases The amounts billed for services provided, sales credited and purchases for the three and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine Months Three MonthsNine Months
20252024202520242025202420252024
Corporate Services billings$50$42$147$134$49$38$144$124
Sales credited16—18—442910666
Purchases billed12413032333215185141
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2025December 31, 2024September 30, 2025December 31, 2024
Net payables to Corporate Services$142$135$71$64
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine Months
2025202420252024
ATC billings to WPL$38$39$114$115
WPL billings to ATC952012