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Common Equity (Tables)

6 Months Ended

Jun. 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			275,892
Equity-based compensation plans			113,549

Shares outstanding, June 30, 2021			250,257,856

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 June 30, 2021
Beginning balance, March 31, 2021	$3	$2,712	$3,063	($1)	($11)	$200	$5,966
Net income attributable to Alliant Energy common shareowners			144				144
Common stock dividends ($0.4025 per share)			(101)				(101)
Shareowner Direct Plan issuances		7					7
Equity-based compensation plans and other		3					3

Ending balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$2	$2,674	$2,834	$2	($10)	$200	$5,702
Net income attributable to Alliant Energy common shareowners			134				134
Common stock dividends ($0.38 per share)			(94)				(94)
Shareowner Direct Plan issuances		7					7
Equity-based compensation plans and other		2					2

Other comprehensive loss, net of tax				(3)			(3)
Ending balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748



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
Six Months Ended June 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			315				315
Common stock dividends ($0.805 per share)			(203)				(203)
Shareowner Direct Plan issuances	1	14					15
Equity-based compensation plans and other		4					4


Ending balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Six Months Ended June 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			304				304
Common stock dividends ($0.76 per share)			(187)				(187)
Equity forward settlements and Shareowner Direct Plan issuances		235					235
Equity-based compensation plans and other		2					2
Adoption of new accounting standard, net of tax			(9)				(9)
Other comprehensive loss, net of tax				(2)			(2)
Ending balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748


IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Three Months Ended June 30, 2021
Beginning balance, March 31, 2021	$33	$2,752	$957	$200	$3,942
Net income available for common stock			86		86
Common stock dividends			(99)		(99)
Capital contributions from parent		50			50
Ending balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$33	$2,448	$914	$200	$3,595
Net income available for common stock			60		60
Common stock dividends			(59)		(59)
Capital contributions from parent		75			75
Ending balance, June 30, 2020	$33	$2,523	$915	$200	$3,671



IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Six Months Ended June 30, 2021
Beginning balance, December 31, 2020	$33	$2,752	$979	$200	$3,964
Net income available for common stock			165		165
Common stock dividends			(200)		(200)
Capital contributions from parent		50			50
Ending balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Six Months Ended June 30, 2020
Beginning balance, December 31, 2019	$33	$2,348	$891	$200	$3,472
Net income available for common stock			142		142
Common stock dividends			(118)		(118)
Capital contributions from parent		175			175
Ending balance, June 30, 2020	$33	$2,523	$915	$200	$3,671


WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2021
Beginning balance, March 31, 2021	$66	$1,584	$995	$2,645
Net income			38	38
Common stock dividends			(43)	(43)
Capital contributions from parent		85		85
Ending balance, June 30, 2021	$66	$1,669	$990	$2,725
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$66	$1,459	$911	$2,436
Net income			58	58
Common stock dividends			(42)	(42)

Ending balance, June 30, 2020	$66	$1,459	$927	$2,452



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2021
Beginning balance, December 31, 2020	$66	$1,459	$953	$2,478
Net income			122	122
Common stock dividends			(85)	(85)
Capital contributions from parent		210		210
Ending balance, June 30, 2021	$66	$1,669	$990	$2,725
Six Months Ended June 30, 2020
Beginning balance, December 31, 2019	$66	$1,434	$864	$2,364
Net income			147	147
Common stock dividends			(84)	(84)
Capital contributions from parent		25		25
Ending balance, June 30, 2020	$66	$1,459	$927	$2,452

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 June 30, 2021
Beginning balance, March 31, 2021	$3	$2,712	$3,063	($1)	($11)	$200	$5,966
Net income attributable to Alliant Energy common shareowners			144				144
Common stock dividends ($0.4025 per share)			(101)				(101)
Shareowner Direct Plan issuances		7					7
Equity-based compensation plans and other		3					3

Ending balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$2	$2,674	$2,834	$2	($10)	$200	$5,702
Net income attributable to Alliant Energy common shareowners			134				134
Common stock dividends ($0.38 per share)			(94)				(94)
Shareowner Direct Plan issuances		7					7
Equity-based compensation plans and other		2					2

Other comprehensive loss, net of tax				(3)			(3)
Ending balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748



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
Six Months Ended June 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			315				315
Common stock dividends ($0.805 per share)			(203)				(203)
Shareowner Direct Plan issuances	1	14					15
Equity-based compensation plans and other		4					4


Ending balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Six Months Ended June 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			304				304
Common stock dividends ($0.76 per share)			(187)				(187)
Equity forward settlements and Shareowner Direct Plan issuances		235					235
Equity-based compensation plans and other		2					2
Adoption of new accounting standard, net of tax			(9)				(9)
Other comprehensive loss, net of tax				(2)			(2)
Ending balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748


IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Three Months Ended June 30, 2021
Beginning balance, March 31, 2021	$33	$2,752	$957	$200	$3,942
Net income available for common stock			86		86
Common stock dividends			(99)		(99)
Capital contributions from parent		50			50
Ending balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$33	$2,448	$914	$200	$3,595
Net income available for common stock			60		60
Common stock dividends			(59)		(59)
Capital contributions from parent		75			75
Ending balance, June 30, 2020	$33	$2,523	$915	$200	$3,671



IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Six Months Ended June 30, 2021
Beginning balance, December 31, 2020	$33	$2,752	$979	$200	$3,964
Net income available for common stock			165		165
Common stock dividends			(200)		(200)
Capital contributions from parent		50			50
Ending balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Six Months Ended June 30, 2020
Beginning balance, December 31, 2019	$33	$2,348	$891	$200	$3,472
Net income available for common stock			142		142
Common stock dividends			(118)		(118)
Capital contributions from parent		175			175
Ending balance, June 30, 2020	$33	$2,523	$915	$200	$3,671


WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2021
Beginning balance, March 31, 2021	$66	$1,584	$995	$2,645
Net income			38	38
Common stock dividends			(43)	(43)
Capital contributions from parent		85		85
Ending balance, June 30, 2021	$66	$1,669	$990	$2,725
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$66	$1,459	$911	$2,436
Net income			58	58
Common stock dividends			(42)	(42)

Ending balance, June 30, 2020	$66	$1,459	$927	$2,452



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2021
Beginning balance, December 31, 2020	$66	$1,459	$953	$2,478
Net income			122	122
Common stock dividends			(85)	(85)
Capital contributions from parent		210		210
Ending balance, June 30, 2021	$66	$1,669	$990	$2,725
Six Months Ended June 30, 2020
Beginning balance, December 31, 2019	$66	$1,434	$864	$2,364
Net income			147	147
Common stock dividends			(84)	(84)
Capital contributions from parent		25		25
Ending balance, June 30, 2020	$66	$1,459	$927	$2,452

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 June 30, 2021
Beginning balance, March 31, 2021	$3	$2,712	$3,063	($1)	($11)	$200	$5,966
Net income attributable to Alliant Energy common shareowners			144				144
Common stock dividends ($0.4025 per share)			(101)				(101)
Shareowner Direct Plan issuances		7					7
Equity-based compensation plans and other		3					3

Ending balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$2	$2,674	$2,834	$2	($10)	$200	$5,702
Net income attributable to Alliant Energy common shareowners			134				134
Common stock dividends ($0.38 per share)			(94)				(94)
Shareowner Direct Plan issuances		7					7
Equity-based compensation plans and other		2					2

Other comprehensive loss, net of tax				(3)			(3)
Ending balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748



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
Six Months Ended June 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			315				315
Common stock dividends ($0.805 per share)			(203)				(203)
Shareowner Direct Plan issuances	1	14					15
Equity-based compensation plans and other		4					4


Ending balance, June 30, 2021	$3	$2,722	$3,106	($1)	($11)	$200	$6,019
Six Months Ended June 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			304				304
Common stock dividends ($0.76 per share)			(187)				(187)
Equity forward settlements and Shareowner Direct Plan issuances		235					235
Equity-based compensation plans and other		2					2
Adoption of new accounting standard, net of tax			(9)				(9)
Other comprehensive loss, net of tax				(2)			(2)
Ending balance, June 30, 2020	$2	$2,683	$2,874	($1)	($10)	$200	$5,748


IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Three Months Ended June 30, 2021
Beginning balance, March 31, 2021	$33	$2,752	$957	$200	$3,942
Net income available for common stock			86		86
Common stock dividends			(99)		(99)
Capital contributions from parent		50			50
Ending balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$33	$2,448	$914	$200	$3,595
Net income available for common stock			60		60
Common stock dividends			(59)		(59)
Capital contributions from parent		75			75
Ending balance, June 30, 2020	$33	$2,523	$915	$200	$3,671



IPL	Total IPL Common Equity
		Additional		Cumulative
	Common	Paid-In	Retained	Preferred	Total
	Stock	Capital	Earnings	Stock	Equity
Six Months Ended June 30, 2021
Beginning balance, December 31, 2020	$33	$2,752	$979	$200	$3,964
Net income available for common stock			165		165
Common stock dividends			(200)		(200)
Capital contributions from parent		50			50
Ending balance, June 30, 2021	$33	$2,802	$944	$200	$3,979
Six Months Ended June 30, 2020
Beginning balance, December 31, 2019	$33	$2,348	$891	$200	$3,472
Net income available for common stock			142		142
Common stock dividends			(118)		(118)
Capital contributions from parent		175			175
Ending balance, June 30, 2020	$33	$2,523	$915	$200	$3,671


WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Three Months Ended June 30, 2021
Beginning balance, March 31, 2021	$66	$1,584	$995	$2,645
Net income			38	38
Common stock dividends			(43)	(43)
Capital contributions from parent		85		85
Ending balance, June 30, 2021	$66	$1,669	$990	$2,725
Three Months Ended June 30, 2020
Beginning balance, March 31, 2020	$66	$1,459	$911	$2,436
Net income			58	58
Common stock dividends			(42)	(42)

Ending balance, June 30, 2020	$66	$1,459	$927	$2,452



WPL		Additional		Total
	Common	Paid-In	Retained	Common
	Stock	Capital	Earnings	Equity
Six Months Ended June 30, 2021
Beginning balance, December 31, 2020	$66	$1,459	$953	$2,478
Net income			122	122
Common stock dividends			(85)	(85)
Capital contributions from parent		210		210
Ending balance, June 30, 2021	$66	$1,669	$990	$2,725
Six Months Ended June 30, 2020
Beginning balance, December 31, 2019	$66	$1,434	$864	$2,364
Net income			147	147
Common stock dividends			(84)	(84)
Capital contributions from parent		25		25
Ending balance, June 30, 2020	$66	$1,459	$927	$2,452