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Debt (Tables)
 9 Months Ended
Sep. 30, 2024
Short-term Debt [Line Items]  
Other Short-Term Borrowings Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2024Alliant EnergyIPLWPL
Amount outstanding$330$—$—
Weighted average interest rates5.0%—%—%
Available credit facility capacity$670$250$300
Alliant EnergyIPLWPL
Three Months Ended September 30202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$330$474$—$7$—$125
Average amount outstanding (based on daily outstanding balances)$197$440$—$—$—$86
Weighted average interest rates5.4%5.5%—%5.5%—%5.4%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)$632$793$19$70$390$349
Average amount outstanding (based on daily outstanding balances)$320$367$1$2$87$135
Weighted average interest rates5.5%5.1%5.5%5.3%5.5%4.9%
IPL [Member]  
Short-term Debt [Line Items]  
Other Short-Term Borrowings Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2024Alliant EnergyIPLWPL
Amount outstanding$330$—$—
Weighted average interest rates5.0%—%—%
Available credit facility capacity$670$250$300
Alliant EnergyIPLWPL
Three Months Ended September 30202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$330$474$—$7$—$125
Average amount outstanding (based on daily outstanding balances)$197$440$—$—$—$86
Weighted average interest rates5.4%5.5%—%5.5%—%5.4%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)$632$793$19$70$390$349
Average amount outstanding (based on daily outstanding balances)$320$367$1$2$87$135
Weighted average interest rates5.5%5.1%5.5%5.3%5.5%4.9%
WPL [Member]  
Short-term Debt [Line Items]  
Other Short-Term Borrowings Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2024Alliant EnergyIPLWPL
Amount outstanding$330$—$—
Weighted average interest rates5.0%—%—%
Available credit facility capacity$670$250$300
Alliant EnergyIPLWPL
Three Months Ended September 30202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$330$474$—$7$—$125
Average amount outstanding (based on daily outstanding balances)$197$440$—$—$—$86
Weighted average interest rates5.4%5.5%—%5.5%—%5.4%
Nine Months Ended September 30
Maximum amount outstanding (based on daily outstanding balances)$632$793$19$70$390$349
Average amount outstanding (based on daily outstanding balances)$320$367$1$2$87$135
Weighted average interest rates5.5%5.1%5.5%5.3%5.5%4.9%