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Receivables (Tables)
 12 Months Ended
Dec. 31, 2021
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
202120202021202020212020
Customer$93 $101 $— $— $82 $92 
Unbilled utility revenues91 82 — — 91 82 
Deferred proceeds214 188 214 188 — — 
Other53 59 28 23 25 35 
Allowance for expected credit losses(11)(18)(1)(1)(10)(17)
$440 $412 $241 $210 $188 $192 
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
202120202019202120202019
Outstanding aggregate cash proceeds$110$96$108$46$9$36
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):
20212020
Customer accounts receivable$125$114
Unbilled utility revenues10492
Receivables sold to third party229206
Less: cash proceeds11
Deferred proceeds228205
Less: allowance for expected credit losses1417
Fair value of deferred proceeds$214$188
Outstanding receivables past due$22$27
Additional Attributes Of Receivables Sold Under The Agreement
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
202120202019
Collections$2,134$2,025$2,193
Write-offs, net of recoveries9719
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
202120202021202020212020
Customer$93 $101 $— $— $82 $92 
Unbilled utility revenues91 82 — — 91 82 
Deferred proceeds214 188 214 188 — — 
Other53 59 28 23 25 35 
Allowance for expected credit losses(11)(18)(1)(1)(10)(17)
$440 $412 $241 $210 $188 $192 
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
202120202019202120202019
Outstanding aggregate cash proceeds$110$96$108$46$9$36
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):
20212020
Customer accounts receivable$125$114
Unbilled utility revenues10492
Receivables sold to third party229206
Less: cash proceeds11
Deferred proceeds228205
Less: allowance for expected credit losses1417
Fair value of deferred proceeds$214$188
Outstanding receivables past due$22$27
Additional Attributes Of Receivables Sold Under The Agreement
Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
202120202019
Collections$2,134$2,025$2,193
Write-offs, net of recoveries9719
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
202120202021202020212020
Customer$93 $101 $— $— $82 $92 
Unbilled utility revenues91 82 — — 91 82 
Deferred proceeds214 188 214 188 — — 
Other53 59 28 23 25 35 
Allowance for expected credit losses(11)(18)(1)(1)(10)(17)
$440 $412 $241 $210 $188 $192