XML 49 R29.htm IDEA: XBRL DOCUMENT v3.24.2.u1
Debt (Tables)
 6 Months Ended
Jun. 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):
June 30, 2024Alliant EnergyIPLWPL
Amount outstanding$52$—$—
Weighted average interest rates5.5%—%—%
Available credit facility capacity$948$250$300
Alliant EnergyIPLWPL
Three Months Ended June 30202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$435$391$19$70$57$91
Average amount outstanding (based on daily outstanding balances)$275$88$2$6$8$18
Weighted average interest rates5.5%5.3%5.5%5.3%5.4%5.2%
Six Months Ended June 30
Maximum amount outstanding (based on daily outstanding balances)$632$793$19$70$390$349
Average amount outstanding (based on daily outstanding balances)$381$330$1$3$131$160
Weighted average interest rates5.5%4.8%5.5%5.3%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):
June 30, 2024Alliant EnergyIPLWPL
Amount outstanding$52$—$—
Weighted average interest rates5.5%—%—%
Available credit facility capacity$948$250$300
Alliant EnergyIPLWPL
Three Months Ended June 30202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$435$391$19$70$57$91
Average amount outstanding (based on daily outstanding balances)$275$88$2$6$8$18
Weighted average interest rates5.5%5.3%5.5%5.3%5.4%5.2%
Six Months Ended June 30
Maximum amount outstanding (based on daily outstanding balances)$632$793$19$70$390$349
Average amount outstanding (based on daily outstanding balances)$381$330$1$3$131$160
Weighted average interest rates5.5%4.8%5.5%5.3%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):
June 30, 2024Alliant EnergyIPLWPL
Amount outstanding$52$—$—
Weighted average interest rates5.5%—%—%
Available credit facility capacity$948$250$300
Alliant EnergyIPLWPL
Three Months Ended June 30202420232024202320242023
Maximum amount outstanding (based on daily outstanding balances)$435$391$19$70$57$91
Average amount outstanding (based on daily outstanding balances)$275$88$2$6$8$18
Weighted average interest rates5.5%5.3%5.5%5.3%5.4%5.2%
Six Months Ended June 30
Maximum amount outstanding (based on daily outstanding balances)$632$793$19$70$390$349
Average amount outstanding (based on daily outstanding balances)$381$330$1$3$131$160
Weighted average interest rates5.5%4.8%5.5%5.3%5.5%4.8%