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Related Parties (Tables)
 9 Months Ended
Sep. 30, 2023
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
20232022202320222023202220232022
Corporate Services billings$46$45$134$136$40$39$120$117
Sales credited311111123314562
Purchases billed13311932034254221103
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2023December 31, 2022September 30, 2023December 31, 2022
Net payables to Corporate Services$136$103$71$56
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
2023202220232022
ATC billings to WPL$41$38$119$107
WPL billings to ATC561614
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
20232022202320222023202220232022
Corporate Services billings$46$45$134$136$40$39$120$117
Sales credited311111123314562
Purchases billed13311932034254221103
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2023December 31, 2022September 30, 2023December 31, 2022
Net payables to Corporate Services$136$103$71$56
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
20232022202320222023202220232022
Corporate Services billings$46$45$134$136$40$39$120$117
Sales credited311111123314562
Purchases billed13311932034254221103
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2023December 31, 2022September 30, 2023December 31, 2022
Net payables to Corporate Services$136$103$71$56
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
2023202220232022
ATC billings to WPL$41$38$119$107
WPL billings to ATC561614