XML 44 R25.htm IDEA: XBRL DOCUMENT v3.22.2

Common Equity (Tables)

6 Months Ended

Jun. 30, 2022

Schedule of Capitalization, Equity [Line Items]

Common Share Activity

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

Shares outstanding, January 1, 2022			250,474,529
Shareowner Direct Plan			228,935
Equity-based compensation plans			222,768
Shares outstanding, June 30, 2022			250,926,232

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
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Loss						Trust						Interest						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$3						$2,750						$3,336						$—						($12)						$—						$6,077
Net income attributable to Alliant Energy common shareowners															159																								159
Common stock dividends ($0.4275 per share)															(108)																								(108)
Shareowner Direct Plan issuances									6																														6
Equity-based compensation plans and other									3																														3
Contributions from noncontrolling interest																																	29						29
Ending balance, June 30, 2022			$3						$2,759						$3,387						$—						($12)						$29						$6,166

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						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

Alliant Energy			Total Alliant Energy Common Equity
																					Accumulated						Shares in
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Loss						Trust						Interest						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$3						$2,749						$3,250						$—						($12)						$—						$5,990
Net income attributable to Alliant Energy common shareowners															351																								351
Common stock dividends ($0.855 per share)															(215)																								(215)
Shareowner Direct Plan issuances									13																														13
Equity-based compensation plans and other									(3)						1																								(2)
Contributions from noncontrolling interest																																	29						29
Ending balance, June 30, 2022			$3						$2,759						$3,387						$—						($12)						$29						$6,166

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						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

IPL			Total IPL Common Equity
									Additional												Cumulative
			Common						Paid-In						Retained						Preferred						Total
			Stock						Capital						Earnings						Stock						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$33						$2,807						$935						$—						$3,775
Net income available for common stock															87												87
Common stock dividends															(80)												(80)
Ending balance, June 30, 2022			$33						$2,807						$942						$—						$3,782
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

IPL			Total IPL Common Equity
									Additional												Cumulative
			Common						Paid-In						Retained						Preferred						Total
			Stock						Capital						Earnings						Stock						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$33						$2,807						$929						$—						$3,769
Net income available for common stock															173												173
Common stock dividends															(160)												(160)
Ending balance, June 30, 2022			$33						$2,807						$942						$—						$3,782
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$66						$1,884						$1,101						$—						$3,051
Net income															63												63
Common stock dividends															(44)												(44)
Capital contributions from parent									85																		85
Contributions from noncontrolling interest																					29						29
Other									(1)																		(1)
Ending balance, June 30, 2022			$66						$1,968						$1,120						$29						$3,183
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$66						$1,704						$1,053						$—						$2,823
Net income															156												156
Common stock dividends															(89)												(89)
Capital contributions from parent									265																		265
Contributions from noncontrolling interest																					29						29
Other									(1)																		(1)
Ending balance, June 30, 2022			$66						$1,968						$1,120						$29						$3,183
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

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
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Loss						Trust						Interest						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$3						$2,750						$3,336						$—						($12)						$—						$6,077
Net income attributable to Alliant Energy common shareowners															159																								159
Common stock dividends ($0.4275 per share)															(108)																								(108)
Shareowner Direct Plan issuances									6																														6
Equity-based compensation plans and other									3																														3
Contributions from noncontrolling interest																																	29						29
Ending balance, June 30, 2022			$3						$2,759						$3,387						$—						($12)						$29						$6,166

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						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

Alliant Energy			Total Alliant Energy Common Equity
																					Accumulated						Shares in
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Loss						Trust						Interest						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$3						$2,749						$3,250						$—						($12)						$—						$5,990
Net income attributable to Alliant Energy common shareowners															351																								351
Common stock dividends ($0.855 per share)															(215)																								(215)
Shareowner Direct Plan issuances									13																														13
Equity-based compensation plans and other									(3)						1																								(2)
Contributions from noncontrolling interest																																	29						29
Ending balance, June 30, 2022			$3						$2,759						$3,387						$—						($12)						$29						$6,166

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						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

IPL			Total IPL Common Equity
									Additional												Cumulative
			Common						Paid-In						Retained						Preferred						Total
			Stock						Capital						Earnings						Stock						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$33						$2,807						$935						$—						$3,775
Net income available for common stock															87												87
Common stock dividends															(80)												(80)
Ending balance, June 30, 2022			$33						$2,807						$942						$—						$3,782
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

IPL			Total IPL Common Equity
									Additional												Cumulative
			Common						Paid-In						Retained						Preferred						Total
			Stock						Capital						Earnings						Stock						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$33						$2,807						$929						$—						$3,769
Net income available for common stock															173												173
Common stock dividends															(160)												(160)
Ending balance, June 30, 2022			$33						$2,807						$942						$—						$3,782
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$66						$1,884						$1,101						$—						$3,051
Net income															63												63
Common stock dividends															(44)												(44)
Capital contributions from parent									85																		85
Contributions from noncontrolling interest																					29						29
Other									(1)																		(1)
Ending balance, June 30, 2022			$66						$1,968						$1,120						$29						$3,183
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$66						$1,704						$1,053						$—						$2,823
Net income															156												156
Common stock dividends															(89)												(89)
Capital contributions from parent									265																		265
Contributions from noncontrolling interest																					29						29
Other									(1)																		(1)
Ending balance, June 30, 2022			$66						$1,968						$1,120						$29						$3,183
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

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
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Loss						Trust						Interest						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$3						$2,750						$3,336						$—						($12)						$—						$6,077
Net income attributable to Alliant Energy common shareowners															159																								159
Common stock dividends ($0.4275 per share)															(108)																								(108)
Shareowner Direct Plan issuances									6																														6
Equity-based compensation plans and other									3																														3
Contributions from noncontrolling interest																																	29						29
Ending balance, June 30, 2022			$3						$2,759						$3,387						$—						($12)						$29						$6,166

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						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

Alliant Energy			Total Alliant Energy Common Equity
																					Accumulated						Shares in
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Loss						Trust						Interest						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$3						$2,749						$3,250						$—						($12)						$—						$5,990
Net income attributable to Alliant Energy common shareowners															351																								351
Common stock dividends ($0.855 per share)															(215)																								(215)
Shareowner Direct Plan issuances									13																														13
Equity-based compensation plans and other									(3)						1																								(2)
Contributions from noncontrolling interest																																	29						29
Ending balance, June 30, 2022			$3						$2,759						$3,387						$—						($12)						$29						$6,166

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						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

IPL			Total IPL Common Equity
									Additional												Cumulative
			Common						Paid-In						Retained						Preferred						Total
			Stock						Capital						Earnings						Stock						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$33						$2,807						$935						$—						$3,775
Net income available for common stock															87												87
Common stock dividends															(80)												(80)
Ending balance, June 30, 2022			$33						$2,807						$942						$—						$3,782
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

IPL			Total IPL Common Equity
									Additional												Cumulative
			Common						Paid-In						Retained						Preferred						Total
			Stock						Capital						Earnings						Stock						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$33						$2,807						$929						$—						$3,769
Net income available for common stock															173												173
Common stock dividends															(160)												(160)
Ending balance, June 30, 2022			$33						$2,807						$942						$—						$3,782
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$66						$1,884						$1,101						$—						$3,051
Net income															63												63
Common stock dividends															(44)												(44)
Capital contributions from parent									85																		85
Contributions from noncontrolling interest																					29						29
Other									(1)																		(1)
Ending balance, June 30, 2022			$66						$1,968						$1,120						$29						$3,183
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$66						$1,704						$1,053						$—						$2,823
Net income															156												156
Common stock dividends															(89)												(89)
Capital contributions from parent									265																		265
Contributions from noncontrolling interest																					29						29
Other									(1)																		(1)
Ending balance, June 30, 2022			$66						$1,968						$1,120						$29						$3,183
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

X

- Definition

Tabular disclosure of an entity's capital units or capital shares, including the value of capital units or capital shares, units authorized, units outstanding and other information necessary to a fair presentation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04.16)
-URI http://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996

+ Details

Name:	us-gaap_ScheduleOfCapitalUnitsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfCapitalizationEquityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

+ Details

Name:	us-gaap_ScheduleOfStockholdersEquityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: