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Related Parties (Tables)
 6 Months Ended
Jun. 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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20242023202420232024202320242023
Corporate Services billings$49$48$92$88$46$43$86$80
Sales credited—1—814103622
Purchases billed105942011871622317
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2024December 31, 2023June 30, 2024December 31, 2023
Net payables to Corporate Services$138$129$67$72
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and six months ended June 30 were as follows (in millions):
Three MonthsSix Months
2024202320242023
ATC billings to WPL$39$44$76$78
WPL billings to ATC45711
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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20242023202420232024202320242023
Corporate Services billings$49$48$92$88$46$43$86$80
Sales credited—1—814103622
Purchases billed105942011871622317
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2024December 31, 2023June 30, 2024December 31, 2023
Net payables to Corporate Services$138$129$67$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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20242023202420232024202320242023
Corporate Services billings$49$48$92$88$46$43$86$80
Sales credited—1—814103622
Purchases billed105942011871622317
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2024December 31, 2023June 30, 2024December 31, 2023
Net payables to Corporate Services$138$129$67$72
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and six months ended June 30 were as follows (in millions):
Three MonthsSix Months
2024202320242023
ATC billings to WPL$39$44$76$78
WPL billings to ATC45711