Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from (used for) operating activities:
Net income	$ 192	$ 174
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	166	164
Deferred tax expense (benefit) and tax credits	18	(29)
Other	(6)	4
Other changes in assets and liabilities:
Accounts receivable	(161)	(126)
Gas stored underground	55	20
Derivative assets	(85)	6
Regulatory assets	19	(4)
Accounts payable	(37)	(6)
Regulatory liabilities	92	(60)
Deferred income taxes	15	58
Other	(17)	(56)
Net cash flows from (used for) operating activities	251	145
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(307)	(214)
Other construction and acquisition expenditures	(23)	(17)
Cash receipts on sold receivables	115	209
Other	(8)	(16)
Net cash flows from (used for) investing activities	(223)	(38)
Cash flows from (used for) financing activities:
Common stock dividends	(107)	(102)
Proceeds from issuance of long-term debt	650	0
Payments to retire long-term debt	(300)	0
Net change in commercial paper	(239)	(53)
Other	(1)	10
Net cash flows from (used for) financing activities	3	(145)
Net increase (decrease) in cash, cash equivalents and restricted cash	31	(38)
Cash, cash equivalents and restricted cash at beginning of period	40	56
Cash, cash equivalents and restricted cash at end of period	71	18
Supplemental cash flows information:
Interest	(62)	(59)
Significant non-cash investing and financing activities:
Accrued capital expenditures	134	64
Beneficial interest obtained in exchange for securitized accounts receivable	227	107
IPL [Member]
Cash flows from (used for) operating activities:
Net income	87	82
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	94	94
Deferred tax expense (benefit) and tax credits	15	(2)
Other	(2)	(1)
Other changes in assets and liabilities:
Accounts receivable	(128)	(133)
Income tax refunds receivable	(17)	(3)
Gas stored underground	29	12
Derivative assets	(43)	10
Regulatory assets	9	(16)
Regulatory liabilities	59	(19)
Other	(14)	(69)
Net cash flows from (used for) operating activities	89	(45)
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(96)	(106)
Cash receipts on sold receivables	115	209
Other	(1)	(5)
Net cash flows from (used for) investing activities	18	98
Cash flows from (used for) financing activities:
Common stock dividends	(81)	(101)
Other	2	9
Net cash flows from (used for) financing activities	(79)	(92)
Net increase (decrease) in cash, cash equivalents and restricted cash	28	(39)
Cash, cash equivalents and restricted cash at beginning of period	34	50
Cash, cash equivalents and restricted cash at end of period	62	11
Supplemental cash flows information:
Interest	(37)	(37)
Income taxes, net	0	(7)
Significant non-cash investing and financing activities:
Accrued capital expenditures	27	31
Beneficial interest obtained in exchange for securitized accounts receivable	227	107
WPL [Member]
Cash flows from (used for) operating activities:
Net income	92	84
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	70	69
Deferred tax expense (benefit) and tax credits	(2)	(28)
Other	(3)	4
Other changes in assets and liabilities:
Accounts receivable	(23)	9
Gas stored underground	26	9
Derivative assets	(42)	(4)
Accounts payable	(24)	(24)
Regulatory liabilities	32	(41)
Accrued taxes	21	8
Deferred income taxes	8	44
Other	12	18
Net cash flows from (used for) operating activities	167	148
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(212)	(108)
Other	(5)	(11)
Net cash flows from (used for) investing activities	(217)	(119)
Cash flows from (used for) financing activities:
Common stock dividends	(44)	(42)
Capital contributions from parent	180	125
Net change in commercial paper	(79)	(109)
Other	(5)	(4)
Net cash flows from (used for) financing activities	52	(30)
Net increase (decrease) in cash, cash equivalents and restricted cash	2	(1)
Cash, cash equivalents and restricted cash at beginning of period	2	3
Cash, cash equivalents and restricted cash at end of period	4	2
Supplemental cash flows information:
Interest	(23)	(21)
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 104	$ 32