XML 81 R47.htm IDEA: XBRL DOCUMENT
v3.22.4

Related Parties (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Related Party Transaction [Line Items] |
Services Provided, Sales Credited And Purchases Billed | The amounts billed for services provided, sales credited and purchases were as follows (in millions):
| IPL |  | WPL
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Corporate Services billings | $181 |  | $180 |  | $176 |  | $155 |  | $154 |  | $142
Sales credited | 19 |  | 22 |  | 35 |  | 74 |  | 23 |  | 3
Purchases billed | 435 |  | 441 |  | 329 |  | 174 |  | 116 |  | 108
Net Intercompany Payables | As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
| 2022 |  | 2021
IPL | $103 |  | $110
WPL | 56 |  | 83
Related Amounts Billed Between Parties | The related amounts billed between the parties were as follows (in millions):
| 2022 |  | 2021 |  | 2020
ATC billings to WPL | $140 |  | $122 |  | $108
WPL billings to ATC | 18 |  | 18 |  | 10
IPL [Member] |
Related Party Transaction [Line Items] |
Services Provided, Sales Credited And Purchases Billed | The amounts billed for services provided, sales credited and purchases were as follows (in millions):
| IPL |  | WPL
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Corporate Services billings | $181 |  | $180 |  | $176 |  | $155 |  | $154 |  | $142
Sales credited | 19 |  | 22 |  | 35 |  | 74 |  | 23 |  | 3
Purchases billed | 435 |  | 441 |  | 329 |  | 174 |  | 116 |  | 108
Net Intercompany Payables | As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
| 2022 |  | 2021
IPL | $103 |  | $110
WPL | 56 |  | 83
WPL [Member] |
Related Party Transaction [Line Items] |
Services Provided, Sales Credited And Purchases Billed | The amounts billed for services provided, sales credited and purchases were as follows (in millions):
| IPL |  | WPL
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Corporate Services billings | $181 |  | $180 |  | $176 |  | $155 |  | $154 |  | $142
Sales credited | 19 |  | 22 |  | 35 |  | 74 |  | 23 |  | 3
Purchases billed | 435 |  | 441 |  | 329 |  | 174 |  | 116 |  | 108
Net Intercompany Payables | As of December 31, net intercompany payables to Corporate Services were as follows (in millions):
| 2022 |  | 2021
IPL | $103 |  | $110
WPL | 56 |  | 83
Related Amounts Billed Between Parties | The related amounts billed between the parties were as follows (in millions):
| 2022 |  | 2021 |  | 2020
ATC billings to WPL | $140 |  | $122 |  | $108
WPL billings to ATC | 18 |  | 18 |  | 10

X
- Definition Schedule of amounts billed for ATC (Table Text Block) + References No definition available. + Details
Name: | lnt_ScheduleOfAtcBillingsTableTextBlock
Namespace Prefix: | lnt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Corporate Services Billings [Table Text Block] + References No definition available. + Details
Name: | lnt_ScheduleOfCorporateServicesBillingsTableTextBlock
Namespace Prefix: | lnt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Corporate Services Intercompany Payables (Table Text Block). + References No definition available. + Details
Name: | lnt_ScheduleOfCorporateServicesIntercompanyPayablesTableTextBlock
Namespace Prefix: | lnt_
Data Type: | dtr-types: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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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: |