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Related Parties (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine MonthsThree MonthsNine Months
20212020202120202021202020212020
Corporate Services billings$50$53$138$134$37$41$113$108
Sales credited41093516—234
Purchases billed10511034724824397179
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2021December 31, 2020September 30, 2021December 31, 2020
Net payables to Corporate Services$109$110$80$73
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine Months
2021202020212020
ATC billings to WPL$29$27$91$80
WPL billings to ATC42138
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 and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine MonthsThree MonthsNine Months
20212020202120202021202020212020
Corporate Services billings$50$53$138$134$37$41$113$108
Sales credited41093516—234
Purchases billed10511034724824397179
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2021December 31, 2020September 30, 2021December 31, 2020
Net payables to Corporate Services$109$110$80$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 and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine MonthsThree MonthsNine Months
20212020202120202021202020212020
Corporate Services billings$50$53$138$134$37$41$113$108
Sales credited41093516—234
Purchases billed10511034724824397179
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2021December 31, 2020September 30, 2021December 31, 2020
Net payables to Corporate Services$109$110$80$73
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
Three MonthsNine Months
2021202020212020
ATC billings to WPL$29$27$91$80
WPL billings to ATC42138