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Receivables (Tables)
 12 Months Ended
Dec. 31, 2022
Accounts Receivable [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
202220212022202120222021
Customer$114 $93 $— $— $102 $82 
Unbilled utility revenues115 91 — — 115 91 
Deferred proceeds185 214 185 214 — — 
Other109 53 74 28 34 25 
Allowance for expected credit losses(7)(11)— (1)(7)(10)
$516 $440 $259 $241 $244 $188 
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
202220212020202220212020
Outstanding aggregate cash proceeds$80$110$96$14$46$9
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):
20222021
Customer accounts receivable$145$125
Unbilled utility revenues132104
Receivables sold to third party277229
Less: cash proceeds801
Deferred proceeds197228
Less: allowance for expected credit losses1214
Fair value of deferred proceeds$185$214
Outstanding receivables past due$26$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):
202220212020
Collections$2,302$2,134$2,025 
Write-offs, net of recoveries997 
IPL [Member]  
Accounts Receivable [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
202220212022202120222021
Customer$114 $93 $— $— $102 $82 
Unbilled utility revenues115 91 — — 115 91 
Deferred proceeds185 214 185 214 — — 
Other109 53 74 28 34 25 
Allowance for expected credit losses(7)(11)— (1)(7)(10)
$516 $440 $259 $241 $244 $188 
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
202220212020202220212020
Outstanding aggregate cash proceeds$80$110$96$14$46$9
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):
20222021
Customer accounts receivable$145$125
Unbilled utility revenues132104
Receivables sold to third party277229
Less: cash proceeds801
Deferred proceeds197228
Less: allowance for expected credit losses1214
Fair value of deferred proceeds$185$214
Outstanding receivables past due$26$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):
202220212020
Collections$2,302$2,134$2,025 
Write-offs, net of recoveries997 
WPL [Member]  
Accounts Receivable [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
202220212022202120222021
Customer$114 $93 $— $— $102 $82 
Unbilled utility revenues115 91 — — 115 91 
Deferred proceeds185 214 185 214 — — 
Other109 53 74 28 34 25 
Allowance for expected credit losses(7)(11)— (1)(7)(10)
$516 $440 $259 $241 $244 $188