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Receivables (Tables)
 12 Months Ended
Dec. 31, 2024
Receivables [Line Items]  
Accounts Receivable Details Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
Alliant EnergyIPLWPL
202420232024202320242023
Customer$113 $121 $— $— $98 $110 
Unbilled utility revenues101 93 — — 101 93 
Deferred proceeds163 216 163 216 — — 
Other58 53 29 26 29 24 
Allowance for expected credit losses(8)(8)— — (8)(8)
$427 $475 $192 $242 $220 $219 
Gross Write-offs for Accounts Receivable
In 2024, gross write-offs for accounts receivable were as follows (in millions):
Originated in 2023
Originated in 2024
Alliant Energy$12$14
IPL89
WPL45
Maximum And Average Outstanding Cash Proceeds IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):
MaximumAverage
202420232022202420232022
Outstanding aggregate cash proceeds$110$110$80$31$51$14
Receivables Sold Under the Agreement
As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
20242023
Customer accounts receivable$137$130
Unbilled utility revenues10898
Other receivables—1
Receivables sold to third party245229
Less: cash proceeds701
Deferred proceeds175228
Less: allowance for expected credit losses1212
Fair value of deferred proceeds$163$216
Outstanding receivables past due$21$22
Additional Attributes Of Receivables Sold Under The Agreement
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
202420232022
Collections$2,090$2,233$2,302 
Write-offs, net of recoveries12129 
IPL [Member]  
Receivables [Line Items]  
Accounts Receivable Details Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
Alliant EnergyIPLWPL
202420232024202320242023
Customer$113 $121 $— $— $98 $110 
Unbilled utility revenues101 93 — — 101 93 
Deferred proceeds163 216 163 216 — — 
Other58 53 29 26 29 24 
Allowance for expected credit losses(8)(8)— — (8)(8)
$427 $475 $192 $242 $220 $219 
Gross Write-offs for Accounts Receivable
In 2024, gross write-offs for accounts receivable were as follows (in millions):
Originated in 2023
Originated in 2024
Alliant Energy$12$14
IPL89
WPL45
Maximum And Average Outstanding Cash Proceeds IPL’s maximum and average outstanding aggregate cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program were as follows (in millions):
MaximumAverage
202420232022202420232022
Outstanding aggregate cash proceeds$110$110$80$31$51$14
Receivables Sold Under the Agreement
As of December 31, the attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
20242023
Customer accounts receivable$137$130
Unbilled utility revenues10898
Other receivables—1
Receivables sold to third party245229
Less: cash proceeds701
Deferred proceeds175228
Less: allowance for expected credit losses1212
Fair value of deferred proceeds$163$216
Outstanding receivables past due$21$22
Additional Attributes Of Receivables Sold Under The Agreement
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
202420232022
Collections$2,090$2,233$2,302 
Write-offs, net of recoveries12129 
WPL [Member]  
Receivables [Line Items]  
Accounts Receivable Details Details for accounts receivable included on the balance sheets as of December 31 were as follows (in millions):
Alliant EnergyIPLWPL
202420232024202320242023
Customer$113 $121 $— $— $98 $110 
Unbilled utility revenues101 93 — — 101 93 
Deferred proceeds163 216 163 216 — — 
Other58 53 29 26 29 24 
Allowance for expected credit losses(8)(8)— — (8)(8)
$427 $475 $192 $242 $220 $219 
Gross Write-offs for Accounts Receivable
In 2024, gross write-offs for accounts receivable were as follows (in millions):
Originated in 2023
Originated in 2024
Alliant Energy$12$14
IPL89
WPL45