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Related Parties
 9 Months Ended
Sep. 30, 2021
Related Party Transactions [Line Items]  
Related Parties RELATED PARTIES
Service Agreements - Pursuant to service agreements, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services, depreciation and amortization of property, plant and equipment, and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO. 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 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
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. 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

WPL owed ATC net amounts of $8 million as of September 30, 2021 and $9 million as of December 31, 2020.
IPL [Member]  
Related Party Transactions [Line Items]  
Related Parties RELATED PARTIES
Service Agreements - Pursuant to service agreements, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services, depreciation and amortization of property, plant and equipment, and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO. 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 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]  
Related Parties RELATED PARTIES
Service Agreements - Pursuant to service agreements, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation and benefits, fees associated with various professional services, depreciation and amortization of property, plant and equipment, and a return on net assets. Corporate Services also acts as agent on behalf of IPL and WPL pursuant to the service agreements. As agent, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions within MISO. Corporate Services assigns such sales and purchases among IPL and WPL based on statements received from MISO. 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 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
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. 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

WPL owed ATC net amounts of $8 million as of September 30, 2021 and $9 million as of December 31, 2020.