Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 351	$ 320
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	332	329
Deferred tax expense (benefit) and tax credits	12	(42)
Other	(16)	2
Other changes in assets and liabilities:
Accounts receivable	(283)	(265)
Derivative assets	(183)	(68)
Regulatory assets	(116)	4
Accounts payable	95	11
Regulatory liabilities	74	(69)
Derivative liabilities	86	(22)
Deferred income taxes	34	93
Pension and other benefit obligations	(18)	(34)
Other	(68)	(52)
Net cash flows from operating activities	300	207
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(550)	(426)
Other construction and acquisition expenditures	(43)	(32)
Cash receipts on sold receivables	233	295
Other	(10)	(27)
Net cash flows from (used for) investing activities	(370)	(190)
Cash flows from (used for) financing activities:
Common stock dividends	(215)	(203)
Proceeds from issuance of long-term debt	650	0
Payments to retire long-term debt	(304)	(4)
Net change in commercial paper	(116)	146
Contributions from noncontrolling interest	29	0
Other	6	4
Net cash flows from (used for) financing activities	50	(57)
Net increase (decrease) in cash, cash equivalents and restricted cash	(20)	(40)
Cash, cash equivalents and restricted cash at beginning of period	40	56
Cash, cash equivalents and restricted cash at end of period	20	16
Supplemental cash flows information:
Interest	(146)	(137)
Income taxes, net	(4)	(1)
Significant non-cash investing and financing activities:
Accrued capital expenditures	200	139
Beneficial interest obtained in exchange for securitized accounts receivable	244	154
IPL [Member]
Cash flows from operating activities:
Net income	173	170
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	189	187
Other	(9)	(13)
Other changes in assets and liabilities:
Accounts receivable	(256)	(270)
Derivative assets	(123)	(27)
Regulatory assets	(52)	(14)
Accounts payable	67	1
Regulatory liabilities	53	(36)
Derivative liabilities	63	(11)
Deferred income taxes	24	30
Other	(46)	1
Net cash flows from operating activities	83	18
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(172)	(191)
Cash receipts on sold receivables	233	295
Other	(1)	(6)
Net cash flows from (used for) investing activities	60	98
Cash flows from (used for) financing activities:
Common stock dividends	(160)	(200)
Capital contributions from parent	0	50
Other	(4)	(5)
Net cash flows from (used for) financing activities	(164)	(155)
Net increase (decrease) in cash, cash equivalents and restricted cash	(21)	(39)
Cash, cash equivalents and restricted cash at beginning of period	34	50
Cash, cash equivalents and restricted cash at end of period	13	11
Supplemental cash flows information:
Interest	(74)	(69)
Income taxes, net	19	27
Significant non-cash investing and financing activities:
Accrued capital expenditures	45	32
Beneficial interest obtained in exchange for securitized accounts receivable	244	154
WPL [Member]
Cash flows from operating activities:
Net income	156	122
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	139	139
Deferred tax expense (benefit) and tax credits	10	(35)
Other	(6)	10
Other changes in assets and liabilities:
Accounts receivable	(17)	9
Derivative assets	(60)	(41)
Regulatory assets	(65)	17
Accounts payable	38	1
Regulatory liabilities	20	(33)
Derivative liabilities	23	(12)
Deferred income taxes	11	63
Other	(51)	(40)
Net cash flows from operating activities	198	200
Cash flows from (used for) investing activities:
Utility business construction and acquisition expenditures	(378)	(235)
Other	(6)	(18)
Net cash flows from (used for) investing activities	(384)	(253)
Cash flows from (used for) financing activities:
Common stock dividends	(89)	(85)
Capital contributions from parent	265	210
Net change in commercial paper	(14)	(65)
Contributions from noncontrolling interest	29	0
Other	(3)	(7)
Net cash flows from (used for) financing activities	188	53
Net increase (decrease) in cash, cash equivalents and restricted cash	2	0
Cash, cash equivalents and restricted cash at beginning of period	2	3
Cash, cash equivalents and restricted cash at end of period	4	3
Supplemental cash flows information:
Interest	(54)	(52)
Income taxes, net	(31)	(27)
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 150	$ 104