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Related Parties (Tables)
 9 Months Ended
Sep. 30, 2024
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
20242023202420232024202320242023
Corporate Services billings$42$46$134$134$38$40$124$120
Sales credited—3—1129236645
Purchases billed1301333323201854121
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2024December 31, 2023September 30, 2024December 31, 2023
Net payables to Corporate Services$131$129$72$72
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
2024202320242023
ATC billings to WPL$39$41$115$119
WPL billings to ATC551216
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
20242023202420232024202320242023
Corporate Services billings$42$46$134$134$38$40$124$120
Sales credited—3—1129236645
Purchases billed1301333323201854121
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2024December 31, 2023September 30, 2024December 31, 2023
Net payables to Corporate Services$131$129$72$72
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
20242023202420232024202320242023
Corporate Services billings$42$46$134$134$38$40$124$120
Sales credited—3—1129236645
Purchases billed1301333323201854121
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2024December 31, 2023September 30, 2024December 31, 2023
Net payables to Corporate Services$131$129$72$72
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
2024202320242023
ATC billings to WPL$39$41$115$119
WPL billings to ATC551216