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Receivables | 9 Months Ended
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Sep. 30, 2020
Receivables [Line Items] |
Receivables | RECEIVABLES Note 3(a) Accounts Receivable - Details for accounts receivable included on the balance sheets were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019
Customer |  | $95 |  |  |  | $92 |  |  |  | $— |  |  |  | $— |  |  |  | $86 |  |  |  | $84 |
Unbilled utility revenues | 62 |  |  | 82 |  |  | — |  |  | — |  |  | 62 |  |  | 82 |
Deferred proceeds | 201 |  |  | 188 |  |  | 201 |  |  | 188 |  |  | — |  |  | — |
Other | 54 |  |  | 47 |  |  | 20 |  |  | 16 |  |  | 33 |  |  | 31 |
Allowance for expected credit losses | (13 | ) |  | (7 | ) |  | (2 | ) |  | (1 | ) |  | (11 | ) |  | (6 | )
|  | $399 |  |  |  | $402 |  |  |  | $219 |  |  |  | $203 |  |  |  | $170 |  |  |  | $191 |
Note 3(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. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of September 30, 2020, IPL had $109 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 and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2020 |  | 2019 |  | 2020 |  | 2019
Maximum outstanding aggregate cash proceeds |  | $1 |  |  |  | $103 |  |  |  | $96 |  |  |  | $108 |
Average outstanding aggregate cash proceeds | 1 |  |  | 45 |  |  | 12 |  |  | 43 |
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| September 30, 2020 |  | December 31, 2019
Customer accounts receivable |  | $148 |  |  |  | $125 |
Unbilled utility revenues | 67 |  |  | 95 |
Other receivables | — |  |  | 1 |
Receivables sold to third party | 215 |  |  | 221 |
Less: cash proceeds | 1 |  |  | 27 |
Deferred proceeds | 214 |  |  | 194 |
Less: allowance for expected credit losses | 13 |  |  | 6 |
Fair value of deferred proceeds |  | $201 |  |  |  | $188 |
As of September 30, 2020, outstanding receivables past due under the Receivables Agreement were $27 million. 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
| 2020 |  | 2019 |  | 2020 |  | 2019
Collections |  | $561 |  |  |  | $592 |  |  |  | $1,555 |  |  |  | $1,636 |
Write-offs, net of recoveries | 1 |  |  | 3 |  |  | 4 |  |  | 11 |
IPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLES Note 3(a) Accounts Receivable - Details for accounts receivable included on the balance sheets were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019
Customer |  | $95 |  |  |  | $92 |  |  |  | $— |  |  |  | $— |  |  |  | $86 |  |  |  | $84 |
Unbilled utility revenues | 62 |  |  | 82 |  |  | — |  |  | — |  |  | 62 |  |  | 82 |
Deferred proceeds | 201 |  |  | 188 |  |  | 201 |  |  | 188 |  |  | — |  |  | — |
Other | 54 |  |  | 47 |  |  | 20 |  |  | 16 |  |  | 33 |  |  | 31 |
Allowance for expected credit losses | (13 | ) |  | (7 | ) |  | (2 | ) |  | (1 | ) |  | (11 | ) |  | (6 | )
|  | $399 |  |  |  | $402 |  |  |  | $219 |  |  |  | $203 |  |  |  | $170 |  |  |  | $191 |
Note 3(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. The transfers of receivables meet the criteria for sale accounting established by the transfer of financial assets accounting rules. As of September 30, 2020, IPL had $109 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 and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2020 |  | 2019 |  | 2020 |  | 2019
Maximum outstanding aggregate cash proceeds |  | $1 |  |  |  | $103 |  |  |  | $96 |  |  |  | $108 |
Average outstanding aggregate cash proceeds | 1 |  |  | 45 |  |  | 12 |  |  | 43 |
The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):
| September 30, 2020 |  | December 31, 2019
Customer accounts receivable |  | $148 |  |  |  | $125 |
Unbilled utility revenues | 67 |  |  | 95 |
Other receivables | — |  |  | 1 |
Receivables sold to third party | 215 |  |  | 221 |
Less: cash proceeds | 1 |  |  | 27 |
Deferred proceeds | 214 |  |  | 194 |
Less: allowance for expected credit losses | 13 |  |  | 6 |
Fair value of deferred proceeds |  | $201 |  |  |  | $188 |
As of September 30, 2020, outstanding receivables past due under the Receivables Agreement were $27 million. 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
| 2020 |  | 2019 |  | 2020 |  | 2019
Collections |  | $561 |  |  |  | $592 |  |  |  | $1,555 |  |  |  | $1,636 |
Write-offs, net of recoveries | 1 |  |  | 3 |  |  | 4 |  |  | 11 |
WPL [Member] |
Receivables [Line Items] |
Receivables | RECEIVABLES Note 3(a) Accounts Receivable - Details for accounts receivable included on the balance sheets were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019 |  | September 30, 2020 |  | December 31, 2019
Customer |  | $95 |  |  |  | $92 |  |  |  | $— |  |  |  | $— |  |  |  | $86 |  |  |  | $84 |
Unbilled utility revenues | 62 |  |  | 82 |  |  | — |  |  | — |  |  | 62 |  |  | 82 |
Deferred proceeds | 201 |  |  | 188 |  |  | 201 |  |  | 188 |  |  | — |  |  | — |
Other | 54 |  |  | 47 |  |  | 20 |  |  | 16 |  |  | 33 |  |  | 31 |
Allowance for expected credit losses | (13 | ) |  | (7 | ) |  | (2 | ) |  | (1 | ) |  | (11 | ) |  | (6 | )
|  | $399 |  |  |  | $402 |  |  |  | $219 |  |  |  | $203 |  |  |  | $170 |  |  |  | $191 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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