Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 323	$ 351
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	333	332
Equity component of allowance for funds used during construction	(32)	(18)
Other	14	14
Other changes in assets and liabilities:
Accounts receivable	(186)	(283)
Gas stored underground	63	17
Derivative assets	86	(183)
Regulatory assets	(36)	(116)
Accounts payable	(84)	95
Derivative liabilities	18	86
Regulatory liabilities	(116)	74
Deferred income taxes	24	34
Other	(96)	(103)
Net cash flows from operating activities	311	300
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(758)	(550)
Other construction and acquisition expenditures	(62)	(43)
Cash receipts on sold receivables	272	233
Proceeds from sales of partial ownership interest in West Riverside	120	0
Other	(54)	(10)
Net cash flows from (used for) investing activities	(482)	(370)
Cash flows from (used for) financing activities:
Common stock dividends	(226)	(215)
Proceeds from issuance of common stock, net	76	13
Proceeds from issuance of long-term debt	862	650
Payments to retire long-term debt	(404)	(304)
Net change in commercial paper and other short-term borrowings	(146)	(116)
Contributions from noncontrolling interest	0	29
Other	(1)	(7)
Net cash flows from (used for) financing activities	161	50
Net increase (decrease) in cash, cash equivalents and restricted cash	(10)	(20)
Cash, cash equivalents and restricted cash at beginning of period	24	40
Cash, cash equivalents and restricted cash at end of period	14	20
Supplemental cash flows information:
Interest	(179)	(146)
Income taxes, net	3	(4)
Significant non-cash investing and financing activities:
Accrued capital expenditures	300	200
Beneficial interest obtained in exchange for securitized accounts receivable	175	244
IPL [Member]
Cash flows from operating activities:
Net income	161	173
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	191	189
Other	2	(9)
Other changes in assets and liabilities:
Accounts receivable	(216)	(256)
Gas stored underground	33	12
Derivative assets	43	(123)
Regulatory assets	(2)	(52)
Accounts payable	(32)	67
Derivative liabilities	(9)	63
Regulatory liabilities	(78)	53
Deferred income taxes	8	24
Other	(49)	(58)
Net cash flows from operating activities	52	83
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(251)	(172)
Cash receipts on sold receivables	272	233
Other	(36)	(1)
Net cash flows from (used for) investing activities	(15)	60
Cash flows from (used for) financing activities:
Common stock dividends	(140)	(160)
Capital contributions from parent	40	0
Net change in commercial paper and other short-term borrowings	55	0
Other	2	(4)
Net cash flows from (used for) financing activities	(43)	(164)
Net increase (decrease) in cash, cash equivalents and restricted cash	(6)	(21)
Cash, cash equivalents and restricted cash at beginning of period	15	34
Cash, cash equivalents and restricted cash at end of period	9	13
Supplemental cash flows information:
Interest	(74)	(74)
Income taxes, net	25	19
Significant non-cash investing and financing activities:
Accrued capital expenditures	95	45
Beneficial interest obtained in exchange for securitized accounts receivable	175	244
WPL [Member]
Cash flows from operating activities:
Net income	160	156
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	137	139
Equity component of allowance for funds used during construction	(26)	(14)
Other	(4)	18
Other changes in assets and liabilities:
Accounts receivable	33	(17)
Gas stored underground	31	5
Derivative assets	47	(60)
Regulatory assets	(35)	(65)
Accounts payable	(54)	38
Derivative liabilities	27	23
Regulatory liabilities	(38)	20
Other	(10)	(45)
Net cash flows from operating activities	268	198
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(507)	(378)
Proceeds from sales of partial ownership interest in West Riverside	120	0
Other	(15)	(6)
Net cash flows from (used for) investing activities	(402)	(384)
Cash flows from (used for) financing activities:
Common stock dividends	(92)	(89)
Capital contributions from parent	180	265
Proceeds from issuance of long-term debt	297	0
Net change in commercial paper and other short-term borrowings	(246)	(14)
Contributions from noncontrolling interest	0	29
Other	(7)	(3)
Net cash flows from (used for) financing activities	132	188
Net increase (decrease) in cash, cash equivalents and restricted cash	(2)	2
Cash, cash equivalents and restricted cash at beginning of period	5	2
Cash, cash equivalents and restricted cash at end of period	3	4
Supplemental cash flows information:
Interest	(69)	(54)
Income taxes, net	(42)	(31)
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 196	$ 150