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Related Parties (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine Months Three MonthsNine Months
20222021202220212022202120222021
Corporate Services billings$45$50$136$138$39$37$117$113
Sales credited11411931166223
Purchases billed119105342347422410371
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2022December 31, 2021September 30, 2022December 31, 2021
Net payables to Corporate Services$113$110$88$83
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
2022202120222021
ATC billings to WPL$38$29$107$91
WPL billings to ATC641413
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 Months Three MonthsNine Months
20222021202220212022202120222021
Corporate Services billings$45$50$136$138$39$37$117$113
Sales credited11411931166223
Purchases billed119105342347422410371
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2022December 31, 2021September 30, 2022December 31, 2021
Net payables to Corporate Services$113$110$88$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 and nine months ended September 30 were as follows (in millions):
IPLWPL
Three MonthsNine Months Three MonthsNine Months
20222021202220212022202120222021
Corporate Services billings$45$50$136$138$39$37$117$113
Sales credited11411931166223
Purchases billed119105342347422410371
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2022December 31, 2021September 30, 2022December 31, 2021
Net payables to Corporate Services$113$110$88$83
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
2022202120222021
ATC billings to WPL$38$29$107$91
WPL billings to ATC641413