Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 582	$ 579
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	503	501
Equity component of allowance for funds used during construction	(53)	(25)
Other	15	25
Other changes in assets and liabilities:
Accounts receivable	(279)	(425)
Materials and supplies	(56)	(13)
Derivative assets	102	(184)
Regulatory assets	40	(102)
Accounts payable	(91)	90
Derivative liabilities	(13)	89
Regulatory liabilities	(126)	89
Other	(2)	(139)
Net cash flows from operating activities	622	485
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(1,201)	(873)
Other construction and acquisition expenditures	(92)	(69)
Cash receipts on sold receivables	306	358
Proceeds from sales of partial ownership interest in West Riverside	120	0
Other	(85)	(15)
Net cash flows from (used for) investing activities	(952)	(599)
Cash flows from (used for) financing activities:
Common stock dividends	(341)	(322)
Proceeds from issuance of common stock, net	201	19
Proceeds from issuance of long-term debt	1,158	1,238
Payments to retire long-term debt	(404)	(379)
Net change in commercial paper and other short-term borrowings	(141)	(132)
Contributions from noncontrolling interest	0	29
Distributions to noncontrolling interest	0	(29)
Other	42	(3)
Net cash flows from (used for) financing activities	515	421
Net increase (decrease) in cash, cash equivalents and restricted cash	185	307
Cash, cash equivalents and restricted cash at beginning of period	24	40
Cash, cash equivalents and restricted cash at end of period	209	347
Supplemental cash flows information:
Interest	(280)	(220)
Income taxes, net	(6)	(7)
Significant non-cash investing and financing activities:
Accrued capital expenditures	287	403
Beneficial interest obtained in exchange for securitized accounts receivable	236	248
IPL [Member]
Cash flows from operating activities:
Net income	331	327
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	288	285
Deferred tax benefit and tax credits	(17)	(24)
Other	(6)	(8)
Other changes in assets and liabilities:
Accounts receivable	(306)	(397)
Derivative assets	53	(118)
Regulatory assets	55	18
Accounts payable	(45)	71
Derivative liabilities	(25)	62
Regulatory liabilities	(90)	61
Deferred income taxes	(44)	(30)
Other	(3)	(81)
Net cash flows from operating activities	191	166
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(427)	(269)
Cash receipts on sold receivables	306	358
Other	(56)	(5)
Net cash flows from (used for) investing activities	(177)	84
Cash flows from (used for) financing activities:
Common stock dividends	(210)	(240)
Capital contributions from parent	60	0
Proceeds from issuance of long-term debt	296	0
Other	13	1
Net cash flows from (used for) financing activities	159	(239)
Net increase (decrease) in cash, cash equivalents and restricted cash	173	11
Cash, cash equivalents and restricted cash at beginning of period	15	34
Cash, cash equivalents and restricted cash at end of period	188	45
Supplemental cash flows information:
Interest	(107)	(111)
Income taxes, net	36	33
Significant non-cash investing and financing activities:
Accrued capital expenditures	108	43
Beneficial interest obtained in exchange for securitized accounts receivable	236	248
WPL [Member]
Cash flows from operating activities:
Net income	267	247
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	208	211
Equity component of allowance for funds used during construction	(43)	(19)
Other	5	23
Other changes in assets and liabilities:
Derivative assets	55	(66)
Regulatory assets	(16)	(120)
Accounts payable	(55)	5
Regulatory liabilities	(37)	28
Other	53	(30)
Net cash flows from operating activities	437	279
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(774)	(604)
Proceeds from sales of partial ownership interest in West Riverside	120	0
Other	(26)	(8)
Net cash flows from (used for) investing activities	(680)	(612)
Cash flows from (used for) financing activities:
Common stock dividends	(138)	(133)
Capital contributions from parent	245	420
Proceeds from issuance of long-term debt	297	588
Net change in commercial paper and other short-term borrowings	(170)	(236)
Contributions from noncontrolling interest	0	29
Distributions to noncontrolling interest	0	(29)
Other	20	(9)
Net cash flows from (used for) financing activities	254	630
Net increase (decrease) in cash, cash equivalents and restricted cash	11	297
Cash, cash equivalents and restricted cash at beginning of period	5	2
Cash, cash equivalents and restricted cash at end of period	16	299
Supplemental cash flows information:
Interest	(106)	(78)
Income taxes, net	(63)	(51)
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 172	$ 355