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Debt (Tables)
 3 Months Ended
Mar. 31, 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):
March 31, 2024Alliant EnergyIPLWPL
Amount outstanding$334$—$—
Weighted average interest rates5.5%—%—%
Available credit facility capacity$666$200$300
Alliant EnergyIPLWPL
Three Months Ended March 31202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$632$793$14$—$390$349
Average amount outstanding (based on daily outstanding balances)$487$574$1$—$255$304
Weighted average interest rates5.5%4.8%5.5%—%5.5%4.8%
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):
March 31, 2024Alliant EnergyIPLWPL
Amount outstanding$334$—$—
Weighted average interest rates5.5%—%—%
Available credit facility capacity$666$200$300
Alliant EnergyIPLWPL
Three Months Ended March 31202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$632$793$14$—$390$349
Average amount outstanding (based on daily outstanding balances)$487$574$1$—$255$304
Weighted average interest rates5.5%4.8%5.5%—%5.5%4.8%
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):
March 31, 2024Alliant EnergyIPLWPL
Amount outstanding$334$—$—
Weighted average interest rates5.5%—%—%
Available credit facility capacity$666$200$300
Alliant EnergyIPLWPL
Three Months Ended March 31202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$632$793$14$—$390$349
Average amount outstanding (based on daily outstanding balances)$487$574$1$—$255$304
Weighted average interest rates5.5%4.8%5.5%—%5.5%4.8%