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Related Parties
 9 Months Ended
Sep. 30, 2023
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 Months Three MonthsNine Months
20232022202320222023202220232022
Corporate Services billings$46$45$134$136$40$39$120$117
Sales credited311111123314562
Purchases billed13311932034254221103

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2023December 31, 2022September 30, 2023December 31, 2022
Net payables to Corporate Services$136$103$71$56

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
2023202220232022
ATC billings to WPL$41$38$119$107
WPL billings to ATC561614

WPL owed ATC net amounts of $9 million as of September 30, 2023 and $10 million as of December 31, 2022.
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 Months Three MonthsNine Months
20232022202320222023202220232022
Corporate Services billings$46$45$134$136$40$39$120$117
Sales credited311111123314562
Purchases billed13311932034254221103

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2023December 31, 2022September 30, 2023December 31, 2022
Net payables to Corporate Services$136$103$71$56
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 Months Three MonthsNine Months
20232022202320222023202220232022
Corporate Services billings$46$45$134$136$40$39$120$117
Sales credited311111123314562
Purchases billed13311932034254221103

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2023December 31, 2022September 30, 2023December 31, 2022
Net payables to Corporate Services$136$103$71$56

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
2023202220232022
ATC billings to WPL$41$38$119$107
WPL billings to ATC561614

WPL owed ATC net amounts of $9 million as of September 30, 2023 and $10 million as of December 31, 2022.