Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 163	$ 192
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	166	166
Other	(6)	12
Other changes in assets and liabilities:
Accounts receivable	(86)	(161)
Gas stored underground	68	55
Derivative assets	115	(85)
Regulatory assets	(32)	19
Accounts payable	(97)	(37)
Regulatory liabilities	(95)	92
Other	(8)	(2)
Net cash flows from operating activities	188	251
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(417)	(307)
Other construction and acquisition expenditures	(34)	(23)
Cash receipts on sold receivables	173	115
Proceeds from sale of partial ownership interest in West Riverside	25	0
Other	(10)	(8)
Net cash flows from (used for) investing activities	(263)	(223)
Cash flows from (used for) financing activities:
Common stock dividends	(113)	(107)
Proceeds from issuance of long-term debt	862	650
Payments to retire long-term debt	0	(300)
Net change in commercial paper and other short-term borrowings	(532)	(239)
Other	(5)	(1)
Net cash flows from (used for) financing activities	212	3
Net increase (decrease) in cash, cash equivalents and restricted cash	137	31
Cash, cash equivalents and restricted cash at beginning of period	24	40
Cash, cash equivalents and restricted cash at end of period	161	71
Supplemental cash flows information:
Interest	(93)	(62)
Significant non-cash investing and financing activities:
Accrued capital expenditures	254	134
Beneficial interest obtained in exchange for securitized accounts receivable	153	227
IPL [Member]
Cash flows from operating activities:
Net income	72	87
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	96	94
Deferred tax expense (benefit) and tax credits	3	15
Other	(2)	(2)
Other changes in assets and liabilities:
Accounts receivable	(106)	(128)
Income tax refunds receivable	(7)	(17)
Gas stored underground	34	29
Derivative assets	69	(43)
Accounts payable	(56)	(8)
Regulatory liabilities	(59)	59
Other	(20)	3
Net cash flows from operating activities	24	89
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(101)	(96)
Cash receipts on sold receivables	173	115
Other	(2)	(1)
Net cash flows from (used for) investing activities	70	18
Cash flows from (used for) financing activities:
Common stock dividends	(70)	(81)
Other	(4)	2
Net cash flows from (used for) financing activities	(74)	(79)
Net increase (decrease) in cash, cash equivalents and restricted cash	20	28
Cash, cash equivalents and restricted cash at beginning of period	15	34
Cash, cash equivalents and restricted cash at end of period	35	62
Supplemental cash flows information:
Interest	(37)	(37)
Significant non-cash investing and financing activities:
Accrued capital expenditures	98	27
Beneficial interest obtained in exchange for securitized accounts receivable	153	227
WPL [Member]
Cash flows from operating activities:
Net income	88	92
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	68	70
Other	(12)	(5)
Other changes in assets and liabilities:
Accounts receivable	19	(23)
Gas stored underground	35	26
Derivative assets	46	(42)
Regulatory assets	(37)	10
Accounts payable	(48)	(24)
Derivative liabilities	28	(2)
Regulatory liabilities	(35)	32
Accrued taxes	19	21
Other	14	12
Net cash flows from operating activities	185	167
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(316)	(212)
Proceeds from sale of partial ownership interest in West Riverside	25	0
Other	(4)	(5)
Net cash flows from (used for) investing activities	(295)	(217)
Cash flows from (used for) financing activities:
Common stock dividends	(46)	(44)
Capital contributions from parent	180	180
Proceeds from issuance of long-term debt	297	0
Net change in commercial paper and other short-term borrowings	(230)	(79)
Other	(10)	(5)
Net cash flows from (used for) financing activities	191	52
Net increase (decrease) in cash, cash equivalents and restricted cash	81	2
Cash, cash equivalents and restricted cash at beginning of period	5	2
Cash, cash equivalents and restricted cash at end of period	86	4
Supplemental cash flows information:
Interest	(40)	(23)
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 152	$ 104