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Common Equity (Tables)

9 Months Ended

Sep. 30, 2021

Schedule of Capitalization, Equity [Line Items]

A summary of Alliant Energy’s common stock activity was as follows:


Shares outstanding, January 1, 2021			249,868,415


Shareowner Direct Plan			378,823
Equity-based compensation plans			113,549

Shares outstanding, September 30, 2021			250,360,787

Changes in Shareowners' Equity

A summary of changes in shareowners’ equity was as follows (in millions):


Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in	Cumulative
		Additional		Other	Deferred	Preferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Stock	Total
	Stock	Capital	Earnings	Income (Loss)	Trust	of IPL	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Net income attributable to Alliant Energy common shareowners			256				256
Common stock dividends ($0.4025 per share)			(101)				(101)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		5					5

Ending balance, September 30, 2021	$3	$2,733	$3,261	($1)	($11)	$200	$6,185
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748
Net income attributable to Alliant Energy common shareowners			246				246
Common stock dividends ($0.38 per share)			(94)				(94)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		4			(1)		3


Ending balance, September 30, 2020	$2	$2,693	$3,026	($1)	($11)	$200	$5,909



Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in	Cumulative
		Additional		Other	Deferred	Preferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Stock	Total
	Stock	Capital	Earnings	Income (Loss)	Trust	of IPL	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$2	$2,704	$2,994	($1)	($11)	$200	$5,888
Net income attributable to Alliant Energy common shareowners			571				571
Common stock dividends ($1.2075 per share)			(304)				(304)
Shareowner Direct Plan issuances	1	21					22
Equity-based compensation plans and other		8					8


Ending balance, September 30, 2021	$3	$2,733	$3,261	($1)	($11)	$200	$6,185
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$2	$2,446	$2,766	$1	($10)	$200	$5,405
Net income attributable to Alliant Energy common shareowners			550				550
Common stock dividends ($1.14 per share)			(281)				(281)
Equity forward settlements and Shareowner Direct Plan issuances		241					241
Equity-based compensation plans and other		6			(1)		5
Adoption of new accounting standard, net of tax			(9)				(9)
Other comprehensive loss, net of tax				(2)			(2)
Ending balance, September 30, 2020	$2	$2,693	$3,026	($1)	($11)	$200	$5,909


IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Net income available for common stock			157		157
Common stock dividends			(101)		(101)

Ending balance, September 30, 2021	$33	$2,802	$1,000	$200	$4,035
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$33	$2,523	$915	$200	$3,671
Net income available for common stock			148		148
Common stock dividends			(59)		(59)
Capital contributions from parent		170			170
Ending balance, September 30, 2020	$33	$2,693	$1,004	$200	$3,930



IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$33	$2,752	$979	$200	$3,964
Net income available for common stock			322		322
Common stock dividends			(301)		(301)
Capital contributions from parent		50			50
Ending balance, September 30, 2021	$33	$2,802	$1,000	$200	$4,035
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$33	$2,348	$891	$200	$3,472
Net income available for common stock			290		290
Common stock dividends			(177)		(177)
Capital contributions from parent		345			345
Ending balance, September 30, 2020	$33	$2,693	$1,004	$200	$3,930


WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$66	$1,669	$990	$2,725
Net income			93	93
Common stock dividends			(41)	(41)
Capital contributions from parent		35		35
Ending balance, September 30, 2021	$66	$1,704	$1,042	$2,812
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$66	$1,459	$927	$2,452
Net income			73	73
Common stock dividends			(43)	(43)

Ending balance, September 30, 2020	$66	$1,459	$957	$2,482



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$66	$1,459	$953	$2,478
Net income			215	215
Common stock dividends			(126)	(126)
Capital contributions from parent		245		245
Ending balance, September 30, 2021	$66	$1,704	$1,042	$2,812
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$66	$1,434	$864	$2,364
Net income			220	220
Common stock dividends			(127)	(127)
Capital contributions from parent		25		25
Ending balance, September 30, 2020	$66	$1,459	$957	$2,482

IPL [Member]

Schedule of Capitalization, Equity [Line Items]

Changes in Shareowners' Equity

A summary of changes in shareowners’ equity was as follows (in millions):


Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in	Cumulative
		Additional		Other	Deferred	Preferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Stock	Total
	Stock	Capital	Earnings	Income (Loss)	Trust	of IPL	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Net income attributable to Alliant Energy common shareowners			256				256
Common stock dividends ($0.4025 per share)			(101)				(101)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		5					5

Ending balance, September 30, 2021	$3	$2,733	$3,261	($1)	($11)	$200	$6,185
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748
Net income attributable to Alliant Energy common shareowners			246				246
Common stock dividends ($0.38 per share)			(94)				(94)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		4			(1)		3


Ending balance, September 30, 2020	$2	$2,693	$3,026	($1)	($11)	$200	$5,909



Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in	Cumulative
		Additional		Other	Deferred	Preferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Stock	Total
	Stock	Capital	Earnings	Income (Loss)	Trust	of IPL	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$2	$2,704	$2,994	($1)	($11)	$200	$5,888
Net income attributable to Alliant Energy common shareowners			571				571
Common stock dividends ($1.2075 per share)			(304)				(304)
Shareowner Direct Plan issuances	1	21					22
Equity-based compensation plans and other		8					8


Ending balance, September 30, 2021	$3	$2,733	$3,261	($1)	($11)	$200	$6,185
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$2	$2,446	$2,766	$1	($10)	$200	$5,405
Net income attributable to Alliant Energy common shareowners			550				550
Common stock dividends ($1.14 per share)			(281)				(281)
Equity forward settlements and Shareowner Direct Plan issuances		241					241
Equity-based compensation plans and other		6			(1)		5
Adoption of new accounting standard, net of tax			(9)				(9)
Other comprehensive loss, net of tax				(2)			(2)
Ending balance, September 30, 2020	$2	$2,693	$3,026	($1)	($11)	$200	$5,909


IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Net income available for common stock			157		157
Common stock dividends			(101)		(101)

Ending balance, September 30, 2021	$33	$2,802	$1,000	$200	$4,035
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$33	$2,523	$915	$200	$3,671
Net income available for common stock			148		148
Common stock dividends			(59)		(59)
Capital contributions from parent		170			170
Ending balance, September 30, 2020	$33	$2,693	$1,004	$200	$3,930



IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$33	$2,752	$979	$200	$3,964
Net income available for common stock			322		322
Common stock dividends			(301)		(301)
Capital contributions from parent		50			50
Ending balance, September 30, 2021	$33	$2,802	$1,000	$200	$4,035
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$33	$2,348	$891	$200	$3,472
Net income available for common stock			290		290
Common stock dividends			(177)		(177)
Capital contributions from parent		345			345
Ending balance, September 30, 2020	$33	$2,693	$1,004	$200	$3,930


WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$66	$1,669	$990	$2,725
Net income			93	93
Common stock dividends			(41)	(41)
Capital contributions from parent		35		35
Ending balance, September 30, 2021	$66	$1,704	$1,042	$2,812
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$66	$1,459	$927	$2,452
Net income			73	73
Common stock dividends			(43)	(43)

Ending balance, September 30, 2020	$66	$1,459	$957	$2,482



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$66	$1,459	$953	$2,478
Net income			215	215
Common stock dividends			(126)	(126)
Capital contributions from parent		245		245
Ending balance, September 30, 2021	$66	$1,704	$1,042	$2,812
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$66	$1,434	$864	$2,364
Net income			220	220
Common stock dividends			(127)	(127)
Capital contributions from parent		25		25
Ending balance, September 30, 2020	$66	$1,459	$957	$2,482

WPL [Member]

Schedule of Capitalization, Equity [Line Items]

Changes in Shareowners' Equity

A summary of changes in shareowners’ equity was as follows (in millions):


Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in	Cumulative
		Additional		Other	Deferred	Preferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Stock	Total
	Stock	Capital	Earnings	Income (Loss)	Trust	of IPL	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Net income attributable to Alliant Energy common shareowners			256				256
Common stock dividends ($0.4025 per share)			(101)				(101)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		5					5

Ending balance, September 30, 2021	$3	$2,733	$3,261	($1)	($11)	$200	$6,185
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748
Net income attributable to Alliant Energy common shareowners			246				246
Common stock dividends ($0.38 per share)			(94)				(94)
Shareowner Direct Plan issuances		6					6
Equity-based compensation plans and other		4			(1)		3


Ending balance, September 30, 2020	$2	$2,693	$3,026	($1)	($11)	$200	$5,909



Alliant Energy	Total Alliant Energy Common Equity
				Accumulated	Shares in	Cumulative
		Additional		Other	Deferred	Preferred
	Common	Paid-In	Retained	Comprehensive	Compensation	Stock	Total
	Stock	Capital	Earnings	Income (Loss)	Trust	of IPL	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$2	$2,704	$2,994	($1)	($11)	$200	$5,888
Net income attributable to Alliant Energy common shareowners			571				571
Common stock dividends ($1.2075 per share)			(304)				(304)
Shareowner Direct Plan issuances	1	21					22
Equity-based compensation plans and other		8					8


Ending balance, September 30, 2021	$3	$2,733	$3,261	($1)	($11)	$200	$6,185
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$2	$2,446	$2,766	$1	($10)	$200	$5,405
Net income attributable to Alliant Energy common shareowners			550				550
Common stock dividends ($1.14 per share)			(281)				(281)
Equity forward settlements and Shareowner Direct Plan issuances		241					241
Equity-based compensation plans and other		6			(1)		5
Adoption of new accounting standard, net of tax			(9)				(9)
Other comprehensive loss, net of tax				(2)			(2)
Ending balance, September 30, 2020	$2	$2,693	$3,026	($1)	($11)	$200	$5,909


IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Net income available for common stock			157		157
Common stock dividends			(101)		(101)

Ending balance, September 30, 2021	$33	$2,802	$1,000	$200	$4,035
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$33	$2,523	$915	$200	$3,671
Net income available for common stock			148		148
Common stock dividends			(59)		(59)
Capital contributions from parent		170			170
Ending balance, September 30, 2020	$33	$2,693	$1,004	$200	$3,930



IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$33	$2,752	$979	$200	$3,964
Net income available for common stock			322		322
Common stock dividends			(301)		(301)
Capital contributions from parent		50			50
Ending balance, September 30, 2021	$33	$2,802	$1,000	$200	$4,035
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$33	$2,348	$891	$200	$3,472
Net income available for common stock			290		290
Common stock dividends			(177)		(177)
Capital contributions from parent		345			345
Ending balance, September 30, 2020	$33	$2,693	$1,004	$200	$3,930


WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended September 30, 2021
Beginning balance, June 30, 2021	$66	$1,669	$990	$2,725
Net income			93	93
Common stock dividends			(41)	(41)
Capital contributions from parent		35		35
Ending balance, September 30, 2021	$66	$1,704	$1,042	$2,812
Three Months Ended September 30, 2020
Beginning balance, June 30, 2020	$66	$1,459	$927	$2,452
Net income			73	73
Common stock dividends			(43)	(43)

Ending balance, September 30, 2020	$66	$1,459	$957	$2,482



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Nine Months Ended September 30, 2021
Beginning balance, December 31, 2020	$66	$1,459	$953	$2,478
Net income			215	215
Common stock dividends			(126)	(126)
Capital contributions from parent		245		245
Ending balance, September 30, 2021	$66	$1,704	$1,042	$2,812
Nine Months Ended September 30, 2020
Beginning balance, December 31, 2019	$66	$1,434	$864	$2,364
Net income			220	220
Common stock dividends			(127)	(127)
Capital contributions from parent		25		25
Ending balance, September 30, 2020	$66	$1,459	$957	$2,482