Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net income	$ 579	$ 579
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	501	494
Deferred tax expense (benefit) and tax credits	8	(69)
Other	(8)	7
Other changes in assets and liabilities:
Accounts receivable	(425)	(397)
Derivative assets	(184)	(202)
Regulatory assets	(102)	(21)
Accounts payable	90	0
Derivative liabilities	89	(21)
Regulatory liabilities	89	25
Deferred income taxes	(15)	160
Pension and other benefit obligations	(25)	(59)
Other	(112)	(19)
Net cash flows from operating activities	485	477
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(873)	(772)
Other construction and acquisition expenditures	(69)	(60)
Cash receipts on sold receivables	358	423
Other	(15)	(43)
Net cash flows from (used for) investing activities	(599)	(452)
Cash flows from (used for) financing activities:
Common stock dividends	(322)	(304)
Proceeds from issuance of long-term debt	1,238	300
Payments to retire long-term debt	(379)	(4)
Net change in commercial paper	(132)	(73)
Contributions from noncontrolling interest	29	0
Distributions to noncontrolling interest	(29)	0
Other	16	24
Net cash flows from (used for) financing activities	421	(57)
Net increase (decrease) in cash, cash equivalents and restricted cash	307	(32)
Cash, cash equivalents and restricted cash at beginning of period	40	56
Cash, cash equivalents and restricted cash at end of period	347	24
Supplemental cash flows information:
Interest	(220)	(197)
Income taxes, net	(7)	(1)
Significant non-cash investing and financing activities:
Accrued capital expenditures	403	91
Beneficial interest obtained in exchange for securitized accounts receivable	248	164
IPL [Member]
Cash flows from operating activities:
Net income	327	330
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	285	281
Deferred tax expense (benefit) and tax credits	(24)	(13)
Other	(8)	(1)
Other changes in assets and liabilities:
Accounts receivable	(397)	(412)
Derivative assets	(118)	(86)
Regulatory assets	18	(33)
Accounts payable	71	5
Derivative liabilities	62	(9)
Regulatory liabilities	61	30
Deferred income taxes	(30)	56
Pension and other benefit obligations	(9)	(25)
Other	(72)	(28)
Net cash flows from operating activities	166	95
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(269)	(285)
Cash receipts on sold receivables	358	423
Other	(5)	(16)
Net cash flows from (used for) investing activities	84	122
Cash flows from (used for) financing activities:
Common stock dividends	(240)	(301)
Capital contributions from parent	0	50
Other	1	(3)
Net cash flows from (used for) financing activities	(239)	(254)
Net increase (decrease) in cash, cash equivalents and restricted cash	11	(37)
Cash, cash equivalents and restricted cash at beginning of period	34	50
Cash, cash equivalents and restricted cash at end of period	45	13
Supplemental cash flows information:
Interest	(111)	(106)
Income taxes, net	33	28
Significant non-cash investing and financing activities:
Accrued capital expenditures	43	30
Beneficial interest obtained in exchange for securitized accounts receivable	248	164
WPL [Member]
Cash flows from operating activities:
Net income	247	215
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	211	209
Deferred tax expense (benefit) and tax credits	11	(63)
Other	(7)	12
Other changes in assets and liabilities:
Derivative assets	(66)	(116)
Regulatory assets	(120)	11
Deferred income taxes	20	108
Other	(17)	(27)
Net cash flows from operating activities	279	349
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(604)	(487)
Other	(8)	(23)
Net cash flows from (used for) investing activities	(612)	(510)
Cash flows from (used for) financing activities:
Common stock dividends	(133)	(126)
Capital contributions from parent	420	245
Proceeds from issuance of long-term debt	588	300
Net change in commercial paper	(236)	(254)
Contributions from noncontrolling interest	29	0
Distributions to noncontrolling interest	(29)	0
Other	(9)	(3)
Net cash flows from (used for) financing activities	630	162
Net increase (decrease) in cash, cash equivalents and restricted cash	297	1
Cash, cash equivalents and restricted cash at beginning of period	2	3
Cash, cash equivalents and restricted cash at end of period	299	4
Supplemental cash flows information:
Interest	(78)	(72)
Income taxes, net	(51)	(24)
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 355	$ 59