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Related Parties (Tables)
 12 Months Ended
Dec. 31, 2020
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
202020192018202020192018
Corporate Services billings$176$185$170$142$142$132
Sales credited3568483728
Purchases billed32933135810812081
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20202019
IPL$110$112
WPL7385
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202020192018
ATC billings to WPL$108$109$106
WPL billings to ATC101311
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
202020192018202020192018
Corporate Services billings$176$185$170$142$142$132
Sales credited3568483728
Purchases billed32933135810812081
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20202019
IPL$110$112
WPL7385
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
202020192018202020192018
Corporate Services billings$176$185$170$142$142$132
Sales credited3568483728
Purchases billed32933135810812081
Net Intercompany Payables
As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
20202019
IPL$110$112
WPL7385
Related Amounts Billed Between Parties The related amounts billed between the parties were as follows (in millions):
202020192018
ATC billings to WPL$108$109$106
WPL billings to ATC101311