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Related Parties (Tables)
 3 Months Ended
Mar. 31, 2021
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
2021202020212020
Corporate Services billings$40$37$35$32
Sales credited11512
Purchases billed143812620
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2021December 31, 2020March 31, 2021December 31, 2020
Net payables to Corporate Services$73$110$60$73
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20212020
ATC billings to WPL$32$28
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
2021202020212020
Corporate Services billings$40$37$35$32
Sales credited11512
Purchases billed143812620
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2021December 31, 2020March 31, 2021December 31, 2020
Net payables to Corporate Services$73$110$60$73
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
2021202020212020
Corporate Services billings$40$37$35$32
Sales credited11512
Purchases billed143812620
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
March 31, 2021December 31, 2020March 31, 2021December 31, 2020
Net payables to Corporate Services$73$110$60$73
Related Amounts Billed Between Parties The related amounts billed between the parties for the three months ended March 31 were as follows (in millions):
20212020
ATC billings to WPL$32$28
WPL billings to ATC33