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Related Parties (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31 were as follows (in millions):
IPLWPL
2024202320242023
Corporate Services billings$43$40$40$36
Sales credited—72213
Purchases billed9693715
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2024December 31, 2023March 31, 2024December 31, 2023
Net payables to Corporate Services$132$129$70$72
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20242023
ATC billings to WPL$37$34
WPL billings to ATC36
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
2024202320242023
Corporate Services billings$43$40$40$36
Sales credited—72213
Purchases billed9693715
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2024December 31, 2023March 31, 2024December 31, 2023
Net payables to Corporate Services$132$129$70$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 months ended March 31 were as follows (in millions):
IPLWPL
2024202320242023
Corporate Services billings$43$40$40$36
Sales credited—72213
Purchases billed9693715
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2024December 31, 2023March 31, 2024December 31, 2023
Net payables to Corporate Services$132$129$70$72
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20242023
ATC billings to WPL$37$34
WPL billings to ATC36