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Receivables (Tables)
 12 Months Ended
Dec. 31, 2025
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
202520242025202420252024
Customer$139 $113 $— $— $126 $98 
Unbilled utility revenues117 101 — — 117 101 
Deferred proceeds126 163 126 163 — — 
Other104 58 59 29 39 29 
Allowance for expected credit losses(10)(8)— — (9)(8)
$476 $427 $185 $192 $273 $220 
Gross Write-offs for Accounts Receivable
In 2025, gross write-offs for accounts receivable were as follows (in millions):
Originated in 2023
Originated in 2024
Originated in 2025
Alliant Energy$1$12$16
IPL189
WPL—47
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
202520242023202520242023
Outstanding aggregate cash proceeds$110$110$110$57$31$51
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):
20252024
Customer accounts receivable$147$137
Unbilled utility revenues104108
Receivables sold to third party251245
Less: cash proceeds11070
Deferred proceeds141175
Less: allowance for expected credit losses1512
Fair value of deferred proceeds$126$163
Outstanding receivables past due$21$21
Additional Attributes Of Receivables Sold Under The Agreement
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
202520242023
Collections$2,279$2,090$2,233 
Write-offs, net of recoveries121212 
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
202520242025202420252024
Customer$139 $113 $— $— $126 $98 
Unbilled utility revenues117 101 — — 117 101 
Deferred proceeds126 163 126 163 — — 
Other104 58 59 29 39 29 
Allowance for expected credit losses(10)(8)— — (9)(8)
$476 $427 $185 $192 $273 $220 
Gross Write-offs for Accounts Receivable
In 2025, gross write-offs for accounts receivable were as follows (in millions):
Originated in 2023
Originated in 2024
Originated in 2025
Alliant Energy$1$12$16
IPL189
WPL—47
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
202520242023202520242023
Outstanding aggregate cash proceeds$110$110$110$57$31$51
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):
20252024
Customer accounts receivable$147$137
Unbilled utility revenues104108
Receivables sold to third party251245
Less: cash proceeds11070
Deferred proceeds141175
Less: allowance for expected credit losses1512
Fair value of deferred proceeds$126$163
Outstanding receivables past due$21$21
Additional Attributes Of Receivables Sold Under The Agreement
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
202520242023
Collections$2,279$2,090$2,233 
Write-offs, net of recoveries121212 
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
202520242025202420252024
Customer$139 $113 $— $— $126 $98 
Unbilled utility revenues117 101 — — 117 101 
Deferred proceeds126 163 126 163 — — 
Other104 58 59 29 39 29 
Allowance for expected credit losses(10)(8)— — (9)(8)
$476 $427 $185 $192 $273 $220 
Gross Write-offs for Accounts Receivable
In 2025, gross write-offs for accounts receivable were as follows (in millions):
Originated in 2023
Originated in 2024
Originated in 2025
Alliant Energy$1$12$16
IPL189
WPL—47