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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 668 $ 540
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 631 571
Deferred tax expense (benefit) and tax credits (125) (103)
Asset valuation charge for IPL's Lansing Generating Station 0 60
Other 2 (9)
Other changes in assets and liabilities:    
Accounts receivable (391) (388)
Regulatory liabilities 107 (67)
Deferred income taxes 101 222
Other (93) 87
Net cash flows from operating activities 900 913
Cash flows from (used for) investing activities:    
Utility business construction and acquisition expenditures (1,487) (1,280)
Other construction and acquisition expenditures (161) (154)
Cash receipts on sold receivables 332 399
Purchases of short-term investments (250) 0
Proceeds from sales of partial ownership interests in West Riverside 0 123
Other (39) (28)
Net cash flows from (used for) investing activities (1,605) (940)
Cash flows from (used for) financing activities:    
Common stock dividends (391) (369)
Proceeds from issuance of long-term debt 2,174 1,613
Payments to retire long-term debt (300) (305)
Net change in commercial paper (366) (145)
Other 10 0
Net cash flows from (used for) financing activities 1,127 794
Net increase (decrease) in cash, cash equivalents and restricted cash 422 767
Cash, cash equivalents and restricted cash at beginning of period 81 63
Cash, cash equivalents and restricted cash at end of period 503 830
Supplemental cash flows information:    
Interest (373) (326)
Income taxes, net 108 158
Significant non-cash investing and financing activities:    
Accrued capital expenditures 246 194
Beneficial interest obtained in exchange for securitized accounts receivable 231 212
Indemnification Agreement [Member] | Renewable Tax Credits Transferred [Member]    
Supplemental cash flows information:    
Proceeds from renewable tax credits transferred to other corporate taxpayers 117 172
IPL [Member]    
Cash flows from operating activities:    
Net income 374 272
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 346 294
Deferred tax expense (benefit) and tax credits (81) (64)
Asset valuation charge for IPL's Lansing Generating Station 0 60
Other (16) (1)
Other changes in assets and liabilities:    
Accounts receivable (392) (392)
Regulatory assets (72) (36)
Regulatory liabilities 11 (65)
Deferred income taxes 134 166
Other (15) (3)
Net cash flows from operating activities 289 231
Cash flows from (used for) investing activities:    
Utility business construction and acquisition expenditures (976) (702)
Cash receipts on sold receivables 332 399
Other (16) (29)
Net cash flows from (used for) investing activities (660) (332)
Cash flows from (used for) financing activities:    
Common stock dividends (270) (151)
Capital contributions from parent 285 325
Proceeds from issuance of long-term debt 888 643
Payments to retire long-term debt (300) 0
Net change in commercial paper (50) 0
Other (2) (13)
Net cash flows from (used for) financing activities 551 804
Net increase (decrease) in cash, cash equivalents and restricted cash 180 703
Cash, cash equivalents and restricted cash at beginning of period 29 53
Cash, cash equivalents and restricted cash at end of period 209 756
Supplemental cash flows information:    
Interest (153) (122)
Income taxes, net 94 114
Significant non-cash investing and financing activities:    
Accrued capital expenditures 152 120
Beneficial interest obtained in exchange for securitized accounts receivable 231 212
IPL [Member] | Indemnification Agreement [Member] | Renewable Tax Credits Transferred [Member]    
Supplemental cash flows information:    
Proceeds from renewable tax credits transferred to other corporate taxpayers 90 89
WPL [Member]    
Cash flows from operating activities:    
Net income 321 270
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 275 269
Deferred tax expense (benefit) and tax credits (60) (45)
Other (2) (2)
Other changes in assets and liabilities:    
Regulatory assets 24 62
Regulatory liabilities 96 (1)
Deferred income taxes (38) 60
Other (43) 38
Net cash flows from operating activities 573 651
Cash flows from (used for) investing activities:    
Utility business construction and acquisition expenditures (511) (578)
Proceeds from sales of partial ownership interests in West Riverside 0 123
Other (19) (9)
Net cash flows from (used for) investing activities (530) (464)
Cash flows from (used for) financing activities:    
Common stock dividends (163) (147)
Capital contributions from parent 80 55
Proceeds from issuance of long-term debt 0 297
Net change in commercial paper 9 (318)
Other (9) (12)
Net cash flows from (used for) financing activities (83) (125)
Net increase (decrease) in cash, cash equivalents and restricted cash (40) 62
Cash, cash equivalents and restricted cash at beginning of period 51 7
Cash, cash equivalents and restricted cash at end of period 11 69
Supplemental cash flows information:    
Interest (136) (123)
Income taxes, net (7) 36
Significant non-cash investing and financing activities:    
Accrued capital expenditures 89 68
WPL [Member] | Indemnification Agreement [Member] | Renewable Tax Credits Transferred [Member]    
Supplemental cash flows information:    
Proceeds from renewable tax credits transferred to other corporate taxpayers $ 27 $ 83