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Related Parties (Tables)
 6 Months Ended
Jun. 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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20222021202220212022202120222021
Corporate Services billings$51$48$91$88$42$41$78$76
Sales credited—4—5136317
Purchases billed1299922324239216147
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2022December 31, 2021June 30, 2022December 31, 2021
Net payables to Corporate Services$112$110$63$83
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and six months ended June 30 were as follows (in millions):
Three MonthsSix Months
2022202120222021
ATC billings to WPL$35$30$69$62
WPL billings to ATC5689
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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20222021202220212022202120222021
Corporate Services billings$51$48$91$88$42$41$78$76
Sales credited—4—5136317
Purchases billed1299922324239216147
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2022December 31, 2021June 30, 2022December 31, 2021
Net payables to Corporate Services$112$110$63$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 six months ended June 30 were as follows (in millions):
IPLWPL
Three MonthsSix Months Three MonthsSix Months
20222021202220212022202120222021
Corporate Services billings$51$48$91$88$42$41$78$76
Sales credited—4—5136317
Purchases billed1299922324239216147
Net Intercompany Payables
Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
June 30, 2022December 31, 2021June 30, 2022December 31, 2021
Net payables to Corporate Services$112$110$63$83
Related Amounts Billed Between Parties The related amounts billed between the parties for the three and six months ended June 30 were as follows (in millions):
Three MonthsSix Months
2022202120222021
ATC billings to WPL$35$30$69$62
WPL billings to ATC5689