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Related Parties (Tables)
 12 Months Ended
Dec. 31, 2022
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
202220212020202220212020
Corporate Services billings$181$180$176$155$154$142
Sales credited19223574233
Purchases billed435441329174116108
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20222021
IPL$103$110
WPL5683
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202220212020
ATC billings to WPL$140$122$108
WPL billings to ATC181810
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
202220212020202220212020
Corporate Services billings$181$180$176$155$154$142
Sales credited19223574233
Purchases billed435441329174116108
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20222021
IPL$103$110
WPL5683
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
202220212020202220212020
Corporate Services billings$181$180$176$155$154$142
Sales credited19223574233
Purchases billed435441329174116108
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20222021
IPL$103$110
WPL5683
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202220212020
ATC billings to WPL$140$122$108
WPL billings to ATC181810