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Related Parties (Tables)
 3 Months Ended
Mar. 31, 2022
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
2022202120222021
Corporate Services billings$40$40$36$35
Sales credited—1181
Purchases billed941432226
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2022December 31, 2021March 31, 2022December 31, 2021
Net payables to Corporate Services$120$110$76$83
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20222021
ATC billings to WPL$34$32
WPL billings to ATC33
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
2022202120222021
Corporate Services billings$40$40$36$35
Sales credited—1181
Purchases billed941432226
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2022December 31, 2021March 31, 2022December 31, 2021
Net payables to Corporate Services$120$110$76$83
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
2022202120222021
Corporate Services billings$40$40$36$35
Sales credited—1181
Purchases billed941432226
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2022December 31, 2021March 31, 2022December 31, 2021
Net payables to Corporate Services$120$110$76$83
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20222021
ATC billings to WPL$34$32
WPL billings to ATC33