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Receivables (Tables) | 9 Months Ended
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Sep. 30, 2023
Receivables [Line Items] |
Gross Write-offs For Accounts Receivable | For the three and nine months ended September 30, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable were as follows (in millions):
| Originated in 2022 |  | Originated in 2023
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
Alliant Energy | $3 |  | $11 |  | $6 |  | $8
IPL | 2 |  | 7 |  | 4 |  | 5
WPL | 1 |  | 4 |  | 2 |  | 3
Maximum And Average Outstanding Cash Proceeds | IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Maximum outstanding aggregate cash proceeds | $94 |  | $36 |  | $110 |  | $66
Average outstanding aggregate cash proceeds | 46 |  | 3 |  | 68 |  | 8
Attributes of Receivables Sold Under the Receivables Agreement | The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| September 30, 2023 |  | December 31, 2022
Customer accounts receivable | $161 |  | $145
Unbilled utility revenues | 88 |  | 132
Other receivables | 1 |  | —
Receivables sold to third party | 250 |  | 277
Less: cash proceeds | 1 |  | 80
Deferred proceeds | 249 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $236 |  | $185
Additional Attributes Of Receivables Sold Under The Receivables Agreement | Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Collections | $616 |  | $670 |  | $1,720 |  | $1,731
Write-offs, net of recoveries | 5 |  | 3 |  | 9 |  | 6
IPL [Member] |
Receivables [Line Items] |
Gross Write-offs For Accounts Receivable | For the three and nine months ended September 30, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable were as follows (in millions):
| Originated in 2022 |  | Originated in 2023
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
Alliant Energy | $3 |  | $11 |  | $6 |  | $8
IPL | 2 |  | 7 |  | 4 |  | 5
WPL | 1 |  | 4 |  | 2 |  | 3
Maximum And Average Outstanding Cash Proceeds | IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Maximum outstanding aggregate cash proceeds | $94 |  | $36 |  | $110 |  | $66
Average outstanding aggregate cash proceeds | 46 |  | 3 |  | 68 |  | 8
Attributes of Receivables Sold Under the Receivables Agreement | The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| September 30, 2023 |  | December 31, 2022
Customer accounts receivable | $161 |  | $145
Unbilled utility revenues | 88 |  | 132
Other receivables | 1 |  | —
Receivables sold to third party | 250 |  | 277
Less: cash proceeds | 1 |  | 80
Deferred proceeds | 249 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $236 |  | $185
Additional Attributes Of Receivables Sold Under The Receivables Agreement | Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Collections | $616 |  | $670 |  | $1,720 |  | $1,731
Write-offs, net of recoveries | 5 |  | 3 |  | 9 |  | 6
WPL [Member] |
Receivables [Line Items] |
Gross Write-offs For Accounts Receivable | For the three and nine months ended September 30, 2023, Alliant Energy’s, IPL’s and WPL’s gross write-offs for accounts receivable were as follows (in millions):
| Originated in 2022 |  | Originated in 2023
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
Alliant Energy | $3 |  | $11 |  | $6 |  | $8
IPL | 2 |  | 7 |  | 4 |  | 5
WPL | 1 |  | 4 |  | 2 |  | 3

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-29 + Details
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