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Segments Of Business (Tables)

12 Months Ended

Dec. 31, 2021

Segment Reporting Information [Line Items]

Schedule of Segments of Business

Certain financial information relating to Alliant Energy’s business segments, which represent the services provided to its customers, was as follows (in millions):

																											ATC Holdings,
			Utility																								Non-utility,						Alliant Energy
2021			Electric						Gas						Other						Total						Parent and Other						Consolidated
Revenues			$3,081						$456						$49						$3,586						$83						$3,669
Depreciation and amortization			591						54						6						651						6						657
Operating income (loss)			716						63						(11)						768						27						795
Interest expense																					244						33						277
Equity income from unconsolidated investments, net			(2)						—						—						(2)						(60)						(62)
Income tax expense (benefit)																					(87)						13						(74)
Net income attributable to Alliant Energy common shareowners																					618						41						659
Total assets			14,924						1,487						1,103						17,514						1,039						18,553
Investments in equity method subsidiaries			17						—						—						17						491						508
Construction and acquisition expenditures			980						90						—						1,070						99						1,169

																											ATC Holdings,
			Utility																								Non-utility,						Alliant Energy
2020			Electric						Gas						Other						Total						Parent and Other						Consolidated
Revenues			$2,920						$373						$49						$3,342						$74						$3,416
Depreciation and amortization			556						49						5						610						5						615
Operating income (loss)			643						74						(1)						716						24						740
Interest expense																					243						32						275
Equity income from unconsolidated investments, net			(2)						—						—						(2)						(59)						(61)
Income tax expense (benefit)																					(66)						9						(57)
Net income attributable to Alliant Energy common shareowners																					573						41						614
Total assets			14,358						1,413						990						16,761						949						17,710
Investments in equity method subsidiaries			11						—						—						11						465						476
Construction and acquisition expenditures			1,109						182						2						1,293						73						1,366

																											ATC Holdings,
			Utility																								Non-utility,						Alliant Energy
2019			Electric						Gas						Other						Total						Parent and Other						Consolidated
Revenues			$3,064						$455						$46						$3,565						$83						$3,648
Depreciation and amortization			513						47						3						563						4						567
Operating income			679						70						1						750						28						778
Interest expense																					229						44						273
Equity income from unconsolidated investments, net			(1)						—						—						(1)						(52)						(53)
Income tax expense (benefit)																					73						(4)						69
Net income attributable to Alliant Energy common shareowners																					517						40						557
Total assets			13,659						1,269						856						15,784						917						16,701
Investments in equity method subsidiaries			9						—						—						9						449						458
Construction and acquisition expenditures			1,439						100						—						1,539						101						1,640

IPL [Member]

Segment Reporting Information [Line Items]

Schedule of Segments of Business

Certain financial information relating to IPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2021			Electric						Gas						Other						Total
Revenues			$1,752						$265						$46						$2,063
Depreciation and amortization			338						31						6						375
Operating income (loss)			420						43						(3)						460
Interest expense																					139
Income tax benefit																					(36)
Net income available for common stock																					350
Total assets			8,602						819						575						9,996
Construction and acquisition expenditures			342						42						—						384

2020			Electric						Gas						Other						Total
Revenues			$1,695						$208						$44						$1,947
Depreciation and amortization			321						30						5						356
Operating income			358						50						2						410
Interest expense																					139
Income tax benefit																					(47)
Net income available for common stock																					324
Total assets			8,518						766						565						9,849
Construction and acquisition expenditures			626						59						2						687

2019			Electric						Gas						Other						Total
Revenues			$1,781						$264						$44						$2,089
Depreciation and amortization			295						29						3						327
Operating income			360						39						4						403
Interest expense																					127
Income taxes																					24
Net income available for common stock																					284
Total assets			8,075						734						468						9,277
Construction and acquisition expenditures			964						56						—						1,020

WPL [Member]

Segment Reporting Information [Line Items]

Schedule of Segments of Business

Certain financial information relating to WPL’s business segments, which represent the services provided to its customers, was as follows (in millions):

2021			Electric						Gas						Other						Total
Revenues			$1,329						$191						$3						$1,523
Depreciation and amortization			253						23						—						276
Operating income (loss)			296						20						(8)						308
Interest expense																					105
Income tax benefit																					(51)
Net income																					268
Total assets			6,322						668						528						7,518
Construction and acquisition expenditures			638						48						—						686

2020			Electric						Gas						Other						Total
Revenues			$1,225						$165						$5						$1,395
Depreciation and amortization			235						19						—						254
Operating income (loss)			285						24						(3)						306
Interest expense																					104
Income tax benefit																					(19)
Net income																					249
Total assets			5,840						647						425						6,912
Construction and acquisition expenditures			483						123						—						606

2019			Electric						Gas						Other						Total
Revenues			$1,283						$191						$2						$1,476
Depreciation and amortization			218						18						—						236
Operating income (loss)			319						31						(3)						347
Interest expense																					102
Income taxes																					49
Net income																					233
Total assets			5,584						535						388						6,507
Construction and acquisition expenditures			475						44						—						519

X

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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