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Related Parties (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31 were as follows (in millions):
IPLWPL
2023202220232022
Corporate Services billings$40$40$36$36
Sales credited7—1318
Purchases billed93941522
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2023December 31, 2022March 31, 2023December 31, 2022
Net payables to Corporate Services$110$103$65$56
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20232022
ATC billings to WPL$34$34
WPL billings to ATC63
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 months ended March 31 were as follows (in millions):
IPLWPL
2023202220232022
Corporate Services billings$40$40$36$36
Sales credited7—1318
Purchases billed93941522
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2023December 31, 2022March 31, 2023December 31, 2022
Net payables to Corporate Services$110$103$65$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 months ended March 31 were as follows (in millions):
IPLWPL
2023202220232022
Corporate Services billings$40$40$36$36
Sales credited7—1318
Purchases billed93941522
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2023December 31, 2022March 31, 2023December 31, 2022
Net payables to Corporate Services$110$103$65$56
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20232022
ATC billings to WPL$34$34
WPL billings to ATC63