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Common Equity (Tables)

6 Months Ended

Jun. 30, 2023

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, 2023			251,134,966
At-the-market offering program			1,221,775
Shareowner Direct Plan			228,017
Equity-based compensation plans			134,334
Shares outstanding, June 30, 2023			252,719,092

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						Income (Loss)						Trust						Interest						Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$3						$2,780						$3,559						($1)						($13)						$—						$6,328
Net income attributable to Alliant Energy common shareowners															160																								160
Common stock dividends ($0.4525 per share)															(113)																								(113)
At-the-market offering program and Shareowner Direct Plan issuances									70																														70
Equity-based compensation plans and other									4																		(1)												3
Other comprehensive income, net of tax																					4																		4
Ending balance, June 30, 2023			$3						$2,854						$3,606						$3						($14)						$—						$6,452
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
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Income (Loss)						Trust						Interest						Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$3						$2,777						$3,509						$—						($13)						$—						$6,276
Net income attributable to Alliant Energy common shareowners															323																								323
Common stock dividends ($0.905 per share)															(226)																								(226)
At-the-market offering program and Shareowner Direct Plan issuances									76																														76
Equity-based compensation plans and other									1																		(1)												—
Other comprehensive income, net of tax																					3																		3
Ending balance, June 30, 2023			$3						$2,854						$3,606						$3						($14)						$—						$6,452
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

IPL									Additional																		Total
			Common						Paid-In						Retained												Common
			Stock						Capital						Earnings												Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$33						$2,807						$970												$3,810
Net income															89												89
Common stock dividends															(70)												(70)
Capital contributions from parent									40																		40
Ending balance, June 30, 2023			$33						$2,847						$989												$3,869
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$33						$2,807						$935												$3,775
Net income															87												87
Common stock dividends															(80)												(80)
Ending balance, June 30, 2022			$33						$2,807						$942												$3,782

IPL									Additional																		Total
			Common						Paid-In						Retained												Common
			Stock						Capital						Earnings												Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$33						$2,807						$968												$3,808
Net income															161												161
Common stock dividends															(140)												(140)
Capital contributions from parent									40																		40
Ending balance, June 30, 2023			$33						$2,847						$989												$3,869
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$33						$2,807						$929												$3,769
Net income															173												173
Common stock dividends															(160)												(160)
Ending balance, June 30, 2022			$33						$2,807						$942												$3,782

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$66						$2,413						$1,234						$—						$3,713
Net income															72												72
Common stock dividends															(46)												(46)
Ending balance, June 30, 2023			$66						$2,413						$1,260						$—						$3,739
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$66						$2,233						$1,192						$—						$3,491
Net income															160												160
Common stock dividends															(92)												(92)
Capital contributions from parent									180																		180
Ending balance, June 30, 2023			$66						$2,413						$1,260						$—						$3,739
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

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						Income (Loss)						Trust						Interest						Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$3						$2,780						$3,559						($1)						($13)						$—						$6,328
Net income attributable to Alliant Energy common shareowners															160																								160
Common stock dividends ($0.4525 per share)															(113)																								(113)
At-the-market offering program and Shareowner Direct Plan issuances									70																														70
Equity-based compensation plans and other									4																		(1)												3
Other comprehensive income, net of tax																					4																		4
Ending balance, June 30, 2023			$3						$2,854						$3,606						$3						($14)						$—						$6,452
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
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Income (Loss)						Trust						Interest						Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$3						$2,777						$3,509						$—						($13)						$—						$6,276
Net income attributable to Alliant Energy common shareowners															323																								323
Common stock dividends ($0.905 per share)															(226)																								(226)
At-the-market offering program and Shareowner Direct Plan issuances									76																														76
Equity-based compensation plans and other									1																		(1)												—
Other comprehensive income, net of tax																					3																		3
Ending balance, June 30, 2023			$3						$2,854						$3,606						$3						($14)						$—						$6,452
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

IPL									Additional																		Total
			Common						Paid-In						Retained												Common
			Stock						Capital						Earnings												Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$33						$2,807						$970												$3,810
Net income															89												89
Common stock dividends															(70)												(70)
Capital contributions from parent									40																		40
Ending balance, June 30, 2023			$33						$2,847						$989												$3,869
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$33						$2,807						$935												$3,775
Net income															87												87
Common stock dividends															(80)												(80)
Ending balance, June 30, 2022			$33						$2,807						$942												$3,782

IPL									Additional																		Total
			Common						Paid-In						Retained												Common
			Stock						Capital						Earnings												Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$33						$2,807						$968												$3,808
Net income															161												161
Common stock dividends															(140)												(140)
Capital contributions from parent									40																		40
Ending balance, June 30, 2023			$33						$2,847						$989												$3,869
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$33						$2,807						$929												$3,769
Net income															173												173
Common stock dividends															(160)												(160)
Ending balance, June 30, 2022			$33						$2,807						$942												$3,782

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$66						$2,413						$1,234						$—						$3,713
Net income															72												72
Common stock dividends															(46)												(46)
Ending balance, June 30, 2023			$66						$2,413						$1,260						$—						$3,739
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$66						$2,233						$1,192						$—						$3,491
Net income															160												160
Common stock dividends															(92)												(92)
Capital contributions from parent									180																		180
Ending balance, June 30, 2023			$66						$2,413						$1,260						$—						$3,739
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

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						Income (Loss)						Trust						Interest						Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$3						$2,780						$3,559						($1)						($13)						$—						$6,328
Net income attributable to Alliant Energy common shareowners															160																								160
Common stock dividends ($0.4525 per share)															(113)																								(113)
At-the-market offering program and Shareowner Direct Plan issuances									70																														70
Equity-based compensation plans and other									4																		(1)												3
Other comprehensive income, net of tax																					4																		4
Ending balance, June 30, 2023			$3						$2,854						$3,606						$3						($14)						$—						$6,452
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
									Additional												Other						Deferred
			Common						Paid-In						Retained						Comprehensive						Compensation						Noncontrolling						Total
			Stock						Capital						Earnings						Income (Loss)						Trust						Interest						Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$3						$2,777						$3,509						$—						($13)						$—						$6,276
Net income attributable to Alliant Energy common shareowners															323																								323
Common stock dividends ($0.905 per share)															(226)																								(226)
At-the-market offering program and Shareowner Direct Plan issuances									76																														76
Equity-based compensation plans and other									1																		(1)												—
Other comprehensive income, net of tax																					3																		3
Ending balance, June 30, 2023			$3						$2,854						$3,606						$3						($14)						$—						$6,452
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

IPL									Additional																		Total
			Common						Paid-In						Retained												Common
			Stock						Capital						Earnings												Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$33						$2,807						$970												$3,810
Net income															89												89
Common stock dividends															(70)												(70)
Capital contributions from parent									40																		40
Ending balance, June 30, 2023			$33						$2,847						$989												$3,869
Three Months Ended June 30, 2022
Beginning balance, March 31, 2022			$33						$2,807						$935												$3,775
Net income															87												87
Common stock dividends															(80)												(80)
Ending balance, June 30, 2022			$33						$2,807						$942												$3,782

IPL									Additional																		Total
			Common						Paid-In						Retained												Common
			Stock						Capital						Earnings												Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$33						$2,807						$968												$3,808
Net income															161												161
Common stock dividends															(140)												(140)
Capital contributions from parent									40																		40
Ending balance, June 30, 2023			$33						$2,847						$989												$3,869
Six Months Ended June 30, 2022
Beginning balance, December 31, 2021			$33						$2,807						$929												$3,769
Net income															173												173
Common stock dividends															(160)												(160)
Ending balance, June 30, 2022			$33						$2,807						$942												$3,782

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Three Months Ended June 30, 2023
Beginning balance, March 31, 2023			$66						$2,413						$1,234						$—						$3,713
Net income															72												72
Common stock dividends															(46)												(46)
Ending balance, June 30, 2023			$66						$2,413						$1,260						$—						$3,739
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

WPL			Total WPL Common Equity
									Additional
			Common						Paid-In						Retained						Noncontrolling						Total
			Stock						Capital						Earnings						Interest						Equity
Six Months Ended June 30, 2023
Beginning balance, December 31, 2022			$66						$2,233						$1,192						$—						$3,491
Net income															160												160
Common stock dividends															(92)												(92)
Capital contributions from parent									180																		180
Ending balance, June 30, 2023			$66						$2,413						$1,260						$—						$3,739
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

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.

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- 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
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

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