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Related Parties (Tables)
 6 Months Ended
Jun. 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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20232022202320222023202220232022
Corporate Services billings$48$51$88$91$43$42$80$78
Sales credited1—8—10132231
Purchases billed941291872232391761
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2023December 31, 2022June 30, 2023December 31, 2022
Net payables to Corporate Services$116$103$73$56
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
2023202220232022
ATC billings to WPL$44$35$78$69
WPL billings to ATC55118
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
20232022202320222023202220232022
Corporate Services billings$48$51$88$91$43$42$80$78
Sales credited1—8—10132231
Purchases billed941291872232391761
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2023December 31, 2022June 30, 2023December 31, 2022
Net payables to Corporate Services$116$103$73$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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20232022202320222023202220232022
Corporate Services billings$48$51$88$91$43$42$80$78
Sales credited1—8—10132231
Purchases billed941291872232391761
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2023December 31, 2022June 30, 2023December 31, 2022
Net payables to Corporate Services$116$103$73$56
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
2023202220232022
ATC billings to WPL$44$35$78$69
WPL billings to ATC55118