XML 44 R25.htm IDEA: XBRL DOCUMENT
v3.23.2

Receivables (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Receivables [Line Items] |
Gross Write-offs For Accounts Receivable | For the three and six months ended June 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 |  | Six Months |  | Three Months |  | Six Months
Alliant Energy | $3 |  | $8 |  | $2 |  | $2
IPL | 2 |  | 5 |  | 1 |  | 1
WPL | 1 |  | 3 |  | 1 |  | 1
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 six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Maximum outstanding aggregate cash proceeds | $110 |  | $66 |  | $110 |  | $66
Average outstanding aggregate cash proceeds | 101 |  | 18 |  | 79 |  | 11
Attributes of Receivables Sold Under the Receivables Agreement | The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| June 30, 2023 |  | December 31, 2022
Customer accounts receivable | $148 |  | $145
Unbilled utility revenues | 100 |  | 132
Receivables sold to third party | 248 |  | 277
Less: cash proceeds | 60 |  | 80
Deferred proceeds | 188 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $175 |  | $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 six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Collections | $514 |  | $500 |  | $1,104 |  | $1,061
Write-offs, net of recoveries | 2 |  | 1 |  | 4 |  | 3
IPL [Member] |
Receivables [Line Items] |
Gross Write-offs For Accounts Receivable | For the three and six months ended June 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 |  | Six Months |  | Three Months |  | Six Months
Alliant Energy | $3 |  | $8 |  | $2 |  | $2
IPL | 2 |  | 5 |  | 1 |  | 1
WPL | 1 |  | 3 |  | 1 |  | 1
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 six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Maximum outstanding aggregate cash proceeds | $110 |  | $66 |  | $110 |  | $66
Average outstanding aggregate cash proceeds | 101 |  | 18 |  | 79 |  | 11
Attributes of Receivables Sold Under the Receivables Agreement | The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| June 30, 2023 |  | December 31, 2022
Customer accounts receivable | $148 |  | $145
Unbilled utility revenues | 100 |  | 132
Receivables sold to third party | 248 |  | 277
Less: cash proceeds | 60 |  | 80
Deferred proceeds | 188 |  | 197
Less: allowance for expected credit losses | 13 |  | 12
Fair value of deferred proceeds | $175 |  | $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 six months ended June 30 were as follows (in millions):
| Three Months |  | Six Months
| 2023 |  | 2022 |  | 2023 |  | 2022
Collections | $514 |  | $500 |  | $1,104 |  | $1,061
Write-offs, net of recoveries | 2 |  | 1 |  | 4 |  | 3
WPL [Member] |
Receivables [Line Items] |
Gross Write-offs For Accounts Receivable | For the three and six months ended June 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 |  | Six Months |  | Three Months |  | Six Months
Alliant Energy | $3 |  | $8 |  | $2 |  | $2
IPL | 2 |  | 5 |  | 1 |  | 1
WPL | 1 |  | 3 |  | 1 |  | 1

X
- Definition Schedule of Additional Attributes of Receivables Sold Under the Agreement [Table Text Block] + References No definition available. + Details
Name: | lnt_ScheduleOfAdditionalAttributesOfReceivablesSoldUnderAgreementTableTextBlock
Namespace Prefix: | lnt_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of maximum and average sales of accounts receivable cash proceeds and related costs. + References No definition available. + Details
Name: | lnt_ScheduleOfSalesOfAccountsReceivableCashProceedsAndRelatedCostsTableTextBlock
Namespace Prefix: | lnt_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |