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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2022
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 Energy |  | IPL |  | WPL
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Customer | $114 |  |  | $93 |  |  | $— |  |  | $— |  |  | $102 |  |  | $82 |
Unbilled utility revenues | 115 |  |  | 91 |  |  | — |  |  | — |  |  | 115 |  |  | 91 |
Deferred proceeds | 185 |  |  | 214 |  |  | 185 |  |  | 214 |  |  | — |  |  | — |
Other | 109 |  |  | 53 |  |  | 74 |  |  | 28 |  |  | 34 |  |  | 25 |
Allowance for expected credit losses | (7) |  |  | (11) |  |  | — |  |  | (1) |  |  | (7) |  |  | (10) |
| $516 |  |  | $440 |  |  | $259 |  |  | $241 |  |  | $244 |  |  | $188 |
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):
| Maximum |  | Average
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Outstanding aggregate cash proceeds | $80 |  | $110 |  | $96 |  | $14 |  | $46 |  | $9
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):
| 2022 |  | 2021
Customer accounts receivable | $145 |  | $125
Unbilled utility revenues | 132 |  | 104
Receivables sold to third party | 277 |  | 229
Less: cash proceeds | 80 |  | 1
Deferred proceeds | 197 |  | 228
Less: allowance for expected credit losses | 12 |  | 14
Fair value of deferred proceeds | $185 |  | $214
Outstanding receivables past due | $26 |  | $22
Additional Attributes Of Receivables Sold Under The Agreement | Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| 2022 |  | 2021 |  | 2020
Collections | $2,302 |  | $2,134 |  | $2,025 |
Write-offs, net of recoveries | 9 |  | 9 |  | 7 |
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 Energy |  | IPL |  | WPL
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Customer | $114 |  |  | $93 |  |  | $— |  |  | $— |  |  | $102 |  |  | $82 |
Unbilled utility revenues | 115 |  |  | 91 |  |  | — |  |  | — |  |  | 115 |  |  | 91 |
Deferred proceeds | 185 |  |  | 214 |  |  | 185 |  |  | 214 |  |  | — |  |  | — |
Other | 109 |  |  | 53 |  |  | 74 |  |  | 28 |  |  | 34 |  |  | 25 |
Allowance for expected credit losses | (7) |  |  | (11) |  |  | — |  |  | (1) |  |  | (7) |  |  | (10) |
| $516 |  |  | $440 |  |  | $259 |  |  | $241 |  |  | $244 |  |  | $188 |
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):
| Maximum |  | Average
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Outstanding aggregate cash proceeds | $80 |  | $110 |  | $96 |  | $14 |  | $46 |  | $9
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):
| 2022 |  | 2021
Customer accounts receivable | $145 |  | $125
Unbilled utility revenues | 132 |  | 104
Receivables sold to third party | 277 |  | 229
Less: cash proceeds | 80 |  | 1
Deferred proceeds | 197 |  | 228
Less: allowance for expected credit losses | 12 |  | 14
Fair value of deferred proceeds | $185 |  | $214
Outstanding receivables past due | $26 |  | $22
Additional Attributes Of Receivables Sold Under The Agreement | Additional attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| 2022 |  | 2021 |  | 2020
Collections | $2,302 |  | $2,134 |  | $2,025 |
Write-offs, net of recoveries | 9 |  | 9 |  | 7 |
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 Energy |  | IPL |  | WPL
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Customer | $114 |  |  | $93 |  |  | $— |  |  | $— |  |  | $102 |  |  | $82 |
Unbilled utility revenues | 115 |  |  | 91 |  |  | — |  |  | — |  |  | 115 |  |  | 91 |
Deferred proceeds | 185 |  |  | 214 |  |  | 185 |  |  | 214 |  |  | — |  |  | — |
Other | 109 |  |  | 53 |  |  | 74 |  |  | 28 |  |  | 34 |  |  | 25 |
Allowance for expected credit losses | (7) |  |  | (11) |  |  | — |  |  | (1) |  |  | (7) |  |  | (10) |
| $516 |  |  | $440 |  |  | $259 |  |  | $241 |  |  | $244 |  |  | $188 |

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