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Receivables | 3 Months Ended
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Mar. 31, 2023
Receivables [Line Items] |
Receivables | RECEIVABLES NOTE 4(a) - Accounts Receivable - For the three months ended March 31, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable, which originated in 2022, were $5 million, $3 million and $2 million, respectively. NOTE 4(b) - Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. In March 2023, IPL amended and extended through March 2024 the purchase commitment from the third party to which it sells its receivables. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of March 31, 2023, IPL had $21 million of available capacity under its sales of accounts receivable program. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three months ended March 31 were as follows (in millions):
| 2023 |  | 2022 |  |  |  |
Maximum outstanding aggregate cash proceeds | $89 |  | $36 |  |  |  |
Average outstanding aggregate cash proceeds | 58 |  | 4 |  |  |  |
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| March 31, 2023 |  | December 31, 2022
Customer accounts receivable | $161 |  | $145
Unbilled utility revenues | 94 |  | 132
Receivables sold to third party | 255 |  | 277
Less: cash proceeds | 89 |  | 80
Deferred proceeds | 166 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $153 |  | $185
As of March 31, 2023, outstanding receivables past due under the Receivables Agreement were $26 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three months ended March 31 were as follows (in millions):
| 2023 |  | 2022 |  |  |  |
Collections | $591 |  | $561 |  |  |  |
Write-offs, net of recoveries | 2 |  | 2 |  |  |  |
IPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLES NOTE 4(a) - Accounts Receivable - For the three months ended March 31, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable, which originated in 2022, were $5 million, $3 million and $2 million, respectively. NOTE 4(b) - Sales of Accounts Receivable - IPL maintains a Receivables Purchase and Sale Agreement (Receivables Agreement) whereby it may sell its customer accounts receivables, unbilled revenues and certain other accounts receivables to a third party through wholly-owned and consolidated special purpose entities. In March 2023, IPL amended and extended through March 2024 the purchase commitment from the third party to which it sells its receivables. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of March 31, 2023, IPL had $21 million of available capacity under its sales of accounts receivable program. IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three months ended March 31 were as follows (in millions):
| 2023 |  | 2022 |  |  |  |
Maximum outstanding aggregate cash proceeds | $89 |  | $36 |  |  |  |
Average outstanding aggregate cash proceeds | 58 |  | 4 |  |  |  |
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| March 31, 2023 |  | December 31, 2022
Customer accounts receivable | $161 |  | $145
Unbilled utility revenues | 94 |  | 132
Receivables sold to third party | 255 |  | 277
Less: cash proceeds | 89 |  | 80
Deferred proceeds | 166 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $153 |  | $185
As of March 31, 2023, outstanding receivables past due under the Receivables Agreement were $26 million. Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three months ended March 31 were as follows (in millions):
| 2023 |  | 2022 |  |  |  |
Collections | $591 |  | $561 |  |  |  |
Write-offs, net of recoveries | 2 |  | 2 |  |  |  |
WPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLESNOTE 4(a) - Accounts Receivable - For the three months ended March 31, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable, which originated in 2022, were $5 million, $3 million and $2 million, respectively.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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