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Related Parties (Tables)
 12 Months Ended
Dec. 31, 2023
Related Party Transaction [Line Items]  
Services Provided, Sales Credited And Purchases Billed The amounts billed for services provided, sales credited and purchases were as follows (in millions):
IPLWPL
202320222021202320222021
Corporate Services billings$181$181$180$163$155$154
Sales credited111922557423
Purchases billed43143544135174116
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20232022
IPL$129$103
WPL7256
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202320222021
ATC billings to WPL$159$140$122
WPL billings to ATC201818
IPL [Member]  
Related Party Transaction [Line Items]  
Services Provided, Sales Credited And Purchases Billed The amounts billed for services provided, sales credited and purchases were as follows (in millions):
IPLWPL
202320222021202320222021
Corporate Services billings$181$181$180$163$155$154
Sales credited111922557423
Purchases billed43143544135174116
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20232022
IPL$129$103
WPL7256
WPL [Member]  
Related Party Transaction [Line Items]  
Services Provided, Sales Credited And Purchases Billed The amounts billed for services provided, sales credited and purchases were as follows (in millions):
IPLWPL
202320222021202320222021
Corporate Services billings$181$181$180$163$155$154
Sales credited111922557423
Purchases billed43143544135174116
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20232022
IPL$129$103
WPL7256
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202320222021
ATC billings to WPL$159$140$122
WPL billings to ATC201818