Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 540	$ 582
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	571	503
Deferred tax expense (benefit) and tax credits	(103)	(8)
Asset valuation charge for IPL's Lansing Generating Station	60	0
Other	(9)	(30)
Other changes in assets and liabilities:
Accounts receivable	(388)	(279)
Derivative assets	7	102
Accounts payable	59	(91)
Regulatory liabilities	(67)	(126)
Deferred income taxes	222	(23)
Other	21	(8)
Net cash flows from operating activities	913	622
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(1,280)	(1,201)
Other construction and acquisition expenditures	(154)	(92)
Cash receipts on sold receivables	399	306
Proceeds from sales of partial ownership interests in West Riverside	123	120
Other	(28)	(85)
Net cash flows from (used for) investing activities	(940)	(952)
Cash flows from (used for) financing activities:
Common stock dividends	(369)	(341)
Proceeds from issuance of common stock, net	18	201
Proceeds from issuance of long-term debt	1,613	1,158
Payments to retire long-term debt	(305)	(404)
Net change in commercial paper and other short-term borrowings	(145)	(141)
Other	(18)	42
Net cash flows from (used for) financing activities	794	515
Net increase (decrease) in cash, cash equivalents and restricted cash	767	185
Cash, cash equivalents and restricted cash at beginning of period	63	24
Cash, cash equivalents and restricted cash at end of period	830	209
Supplemental cash flows information:
Interest	(326)	(280)
Income taxes, net	158	(6)
Significant non-cash investing and financing activities:
Accrued capital expenditures	194	287
Beneficial interest obtained in exchange for securitized accounts receivable	212	236
Indemnification Agreement [Member] | Renewable Tax Credits Transferred [Member]
Supplemental cash flows information:
Proceeds from renewable tax credits transferred to other corporate taxpayers	172
IPL [Member]
Cash flows from operating activities:
Net income	272	331
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	294	288
Deferred tax expense (benefit) and tax credits	(64)	(17)
Asset valuation charge for IPL's Lansing Generating Station	60	0
Other	(1)	(6)
Other changes in assets and liabilities:
Accounts receivable	(392)	(306)
Derivative assets	(1)	53
Regulatory assets	(36)	55
Regulatory liabilities	(65)	(90)
Deferred income taxes	166	(44)
Other	(2)	(73)
Net cash flows from operating activities	231	191
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(702)	(427)
Cash receipts on sold receivables	399	306
Other	(29)	(56)
Net cash flows from (used for) investing activities	(332)	(177)
Cash flows from (used for) financing activities:
Common stock dividends	(151)	(210)
Capital contributions from parent	325	60
Proceeds from issuance of long-term debt	643	296
Other	(13)	13
Net cash flows from (used for) financing activities	804	159
Net increase (decrease) in cash, cash equivalents and restricted cash	703	173
Cash, cash equivalents and restricted cash at beginning of period	53	15
Cash, cash equivalents and restricted cash at end of period	756	188
Supplemental cash flows information:
Interest	(122)	(107)
Income taxes, net	114	36
Significant non-cash investing and financing activities:
Accrued capital expenditures	120	108
Beneficial interest obtained in exchange for securitized accounts receivable	212	236
IPL [Member] | Indemnification Agreement [Member] | Renewable Tax Credits Transferred [Member]
Supplemental cash flows information:
Proceeds from renewable tax credits transferred to other corporate taxpayers	89
WPL [Member]
Cash flows from operating activities:
Net income	270	267
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	269	208
Other	(47)	(38)
Other changes in assets and liabilities:
Derivative assets	7	55
Regulatory assets	62	(16)
Accounts payable	28	(55)
Deferred income taxes	60	19
Other	2	(3)
Net cash flows from operating activities	651	437
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(578)	(774)
Proceeds from sales of partial ownership interests in West Riverside	123	120
Other	(9)	(26)
Net cash flows from (used for) investing activities	(464)	(680)
Cash flows from (used for) financing activities:
Common stock dividends	(147)	(138)
Capital contributions from parent	55	245
Proceeds from issuance of long-term debt	297	297
Net change in commercial paper and other short-term borrowings	(318)	(170)
Other	(12)	20
Net cash flows from (used for) financing activities	(125)	254
Net increase (decrease) in cash, cash equivalents and restricted cash	62	11
Cash, cash equivalents and restricted cash at beginning of period	7	5
Cash, cash equivalents and restricted cash at end of period	69	16
Supplemental cash flows information:
Interest	(123)	(106)
Income taxes, net	36	(63)
Significant non-cash investing and financing activities:
Accrued capital expenditures	68	$ 172
WPL [Member] | Indemnification Agreement [Member] | Renewable Tax Credits Transferred [Member]
Supplemental cash flows information:
Proceeds from renewable tax credits transferred to other corporate taxpayers	$ 83