Receivables (Tables)

9 Months Ended

Sep. 30, 2020

Receivables [Line Items]

Accounts Receivable Details

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

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
	2020		2019		2020		2019
Maximum outstanding aggregate cash proceeds		$1		$103		$96		$108
Average outstanding aggregate cash proceeds	1		45		12		43

Schedule of Sales Of Accounts Receivable Sold Under Agreement Table Text Block

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

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
	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]

Accounts Receivable Details

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

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
	2020		2019		2020		2019
Maximum outstanding aggregate cash proceeds		$1		$103		$96		$108
Average outstanding aggregate cash proceeds	1		45		12		43

Schedule of Sales Of Accounts Receivable Sold Under Agreement Table Text Block

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

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
	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]

Accounts Receivable Details

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