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Related Parties
 9 Months Ended
Sep. 30, 2024
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
20242023202420232024202320242023
Corporate Services billings$42$46$134$134$38$40$124$120
Sales credited—3—1129236645
Purchases billed1301333323201854121

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2024December 31, 2023September 30, 2024December 31, 2023
Net payables to Corporate Services$131$129$72$72

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
2024202320242023
ATC billings to WPL$39$41$115$119
WPL billings to ATC551216

WPL owed ATC net amounts of $11 million as of September 30, 2024 and $10 million as of December 31, 2023.
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
20242023202420232024202320242023
Corporate Services billings$42$46$134$134$38$40$124$120
Sales credited—3—1129236645
Purchases billed1301333323201854121

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2024December 31, 2023September 30, 2024December 31, 2023
Net payables to Corporate Services$131$129$72$72
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
20242023202420232024202320242023
Corporate Services billings$42$46$134$134$38$40$124$120
Sales credited—3—1129236645
Purchases billed1301333323201854121

Net intercompany payables to Corporate Services were as follows (in millions):
IPLWPL
September 30, 2024December 31, 2023September 30, 2024December 31, 2023
Net payables to Corporate Services$131$129$72$72

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
2024202320242023
ATC billings to WPL$39$41$115$119
WPL billings to ATC551216

WPL owed ATC net amounts of $11 million as of September 30, 2024 and $10 million as of December 31, 2023.