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Related Parties (Tables)
 12 Months Ended
Dec. 31, 2021
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
202120202019202120202019
Corporate Services billings$180$176$185$154$142$142
Sales credited2235682337
Purchases billed441329331116108120
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20212020
IPL$110$110
WPL8373
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202120202019
ATC billings to WPL$122$108$109
WPL billings to ATC181013
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
202120202019202120202019
Corporate Services billings$180$176$185$154$142$142
Sales credited2235682337
Purchases billed441329331116108120
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20212020
IPL$110$110
WPL8373
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
202120202019202120202019
Corporate Services billings$180$176$185$154$142$142
Sales credited2235682337
Purchases billed441329331116108120
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20212020
IPL$110$110
WPL8373
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202120202019
ATC billings to WPL$122$108$109
WPL billings to ATC181013