Segments Of Business (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.

Alliant Energy										ATC Holdings,		Alliant
	Utility									Non-Utility,		Energy
	Electric		Gas			Other		Total		Parent and Other		Consolidated
	(in millions)
Three Months Ended September 30, 2020
Revenues		$852		$42			$10		$904		$16		$920
Operating income (loss)	251		(1		)	1		251		21		272
Net income attributable to Alliant Energy common shareowners								221		25		246
Three Months Ended September 30, 2019
Revenues		$916		$42			$11		$969		$21		$990
Operating income (loss)	284		(5		)	3		282		8		290
Net income attributable to Alliant Energy common shareowners								217		9		226

Alliant Energy									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Nine Months Ended September 30, 2020
Revenues		$2,257		$253		$32		$2,542		$57		$2,599
Operating income	549		48		5		602		26		628
Net income attributable to Alliant Energy common shareowners							510		40		550
Nine Months Ended September 30, 2019
Revenues		$2,350		$323		$33		$2,706		$62		$2,768
Operating income	543		47		5		595		22		617
Net income attributable to Alliant Energy common shareowners							422		24		446

IPL	Electric		Gas			Other		Total
	(in millions)
Three Months Ended September 30, 2020
Revenues		$519		$24			$10		$553
Operating income	159		1			2		162
Net income available for common stock								148
Three Months Ended September 30, 2019
Revenues		$561		$25			$11		$597
Operating income (loss)	175		(4		)	3		174
Net income available for common stock								141
Nine Months Ended September 30, 2020
Revenues		$1,332		$141			$31		$1,504
Operating income	308		34			5		347
Net income available for common stock								290
Nine Months Ended September 30, 2019
Revenues		$1,373		$188			$32		$1,593
Operating income	291		26			5		322
Net income available for common stock								239

WPL	Electric		Gas			Other			Total
	(in millions)
Three Months Ended September 30, 2020
Revenues		$333		$18			$—			$351
Operating income (loss)	92		(2		)	(1		)	89
Net income									73
Three Months Ended September 30, 2019
Revenues		$355		$17			$—			$372
Operating income (loss)	109		(1		)	—			108
Net income									76
Nine Months Ended September 30, 2020
Revenues		$925		$112			$1			$1,038
Operating income	241		14			—			255
Net income									220
Nine Months Ended September 30, 2019
Revenues		$977		$135			$1			$1,113
Operating income	252		21			—			273
Net income									183

IPL [Member]

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.

Alliant Energy										ATC Holdings,		Alliant
	Utility									Non-Utility,		Energy
	Electric		Gas			Other		Total		Parent and Other		Consolidated
	(in millions)
Three Months Ended September 30, 2020
Revenues		$852		$42			$10		$904		$16		$920
Operating income (loss)	251		(1		)	1		251		21		272
Net income attributable to Alliant Energy common shareowners								221		25		246
Three Months Ended September 30, 2019
Revenues		$916		$42			$11		$969		$21		$990
Operating income (loss)	284		(5		)	3		282		8		290
Net income attributable to Alliant Energy common shareowners								217		9		226

Alliant Energy									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Nine Months Ended September 30, 2020
Revenues		$2,257		$253		$32		$2,542		$57		$2,599
Operating income	549		48		5		602		26		628
Net income attributable to Alliant Energy common shareowners							510		40		550
Nine Months Ended September 30, 2019
Revenues		$2,350		$323		$33		$2,706		$62		$2,768
Operating income	543		47		5		595		22		617
Net income attributable to Alliant Energy common shareowners							422		24		446

IPL	Electric		Gas			Other		Total
	(in millions)
Three Months Ended September 30, 2020
Revenues		$519		$24			$10		$553
Operating income	159		1			2		162
Net income available for common stock								148
Three Months Ended September 30, 2019
Revenues		$561		$25			$11		$597
Operating income (loss)	175		(4		)	3		174
Net income available for common stock								141
Nine Months Ended September 30, 2020
Revenues		$1,332		$141			$31		$1,504
Operating income	308		34			5		347
Net income available for common stock								290
Nine Months Ended September 30, 2019
Revenues		$1,373		$188			$32		$1,593
Operating income	291		26			5		322
Net income available for common stock								239

WPL	Electric		Gas			Other			Total
	(in millions)
Three Months Ended September 30, 2020
Revenues		$333		$18			$—			$351
Operating income (loss)	92		(2		)	(1		)	89
Net income									73
Three Months Ended September 30, 2019
Revenues		$355		$17			$—			$372
Operating income (loss)	109		(1		)	—			108
Net income									76
Nine Months Ended September 30, 2020
Revenues		$925		$112			$1			$1,038
Operating income	241		14			—			255
Net income									220
Nine Months Ended September 30, 2019
Revenues		$977		$135			$1			$1,113
Operating income	252		21			—			273
Net income									183

WPL [Member]

Segment Reporting Information [Line Items]

Schedule Of Segments Of Business

Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.

Alliant Energy										ATC Holdings,		Alliant
	Utility									Non-Utility,		Energy
	Electric		Gas			Other		Total		Parent and Other		Consolidated
	(in millions)
Three Months Ended September 30, 2020
Revenues		$852		$42			$10		$904		$16		$920
Operating income (loss)	251		(1		)	1		251		21		272
Net income attributable to Alliant Energy common shareowners								221		25		246
Three Months Ended September 30, 2019
Revenues		$916		$42			$11		$969		$21		$990
Operating income (loss)	284		(5		)	3		282		8		290
Net income attributable to Alliant Energy common shareowners								217		9		226

Alliant Energy									ATC Holdings,		Alliant
	Utility								Non-Utility,		Energy
	Electric		Gas		Other		Total		Parent and Other		Consolidated
	(in millions)
Nine Months Ended September 30, 2020
Revenues		$2,257		$253		$32		$2,542		$57		$2,599
Operating income	549		48		5		602		26		628
Net income attributable to Alliant Energy common shareowners							510		40		550
Nine Months Ended September 30, 2019
Revenues		$2,350		$323		$33		$2,706		$62		$2,768
Operating income	543		47		5		595		22		617
Net income attributable to Alliant Energy common shareowners							422		24		446

IPL	Electric		Gas			Other		Total
	(in millions)
Three Months Ended September 30, 2020
Revenues		$519		$24			$10		$553
Operating income	159		1			2		162
Net income available for common stock								148
Three Months Ended September 30, 2019
Revenues		$561		$25			$11		$597
Operating income (loss)	175		(4		)	3		174
Net income available for common stock								141
Nine Months Ended September 30, 2020
Revenues		$1,332		$141			$31		$1,504
Operating income	308		34			5		347
Net income available for common stock								290
Nine Months Ended September 30, 2019
Revenues		$1,373		$188			$32		$1,593
Operating income	291		26			5		322
Net income available for common stock								239

WPL	Electric		Gas			Other			Total
	(in millions)
Three Months Ended September 30, 2020
Revenues		$333		$18			$—			$351
Operating income (loss)	92		(2		)	(1		)	89
Net income									73
Three Months Ended September 30, 2019
Revenues		$355		$17			$—			$372
Operating income (loss)	109		(1		)	—			108
Net income									76
Nine Months Ended September 30, 2020
Revenues		$925		$112			$1			$1,038
Operating income	241		14			—			255
Net income									220
Nine Months Ended September 30, 2019
Revenues		$977		$135			$1			$1,113
Operating income	252		21			—			273
Net income									183