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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2024
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities | The Company has recorded regulatory assets and liabilities (in millions) that it expects to pass through to its customers in accordance with, and subject to, regulatory provisions as follows:
December 31, | 2024 |  | 2023 |  | Recovery/Refund Period Ends
Regulatory assets |  |  |  |  |
Current regulatory assets: |  |  |  |  |
Undercollection of rate riders | $ | 177 |  |  | $ | 127 |  |  | 2025
El Salvador energy pass through costs recovery | 117 |  |  | 119 |  |  | 2025
Other | 37 |  |  | 19 |  |  | 2025
Total current regulatory assets | 331 |  |  | 265 |  |  |
Noncurrent regulatory assets: |  |  |  |  |
AES Indiana and AES Ohio defined benefit pension obligations (1) | 183 |  |  | 179 |  |  | Various
AES Indiana Petersburg Units 1 and 2 retirement costs (1) | 129 |  |  | 260 |  |  | 2033
AES Indiana Petersburg Units 3 and 4 retirement costs (1) | 94 |  |  | — |  |  | Various
AES Indiana environmental costs | 65 |  |  | 70 |  |  | Various
AES Indiana Hoosier Wind termination of pre-existing PPA (1) (2) | 53 |  |  | — |  |  | 2039
AES Indiana TDSIC costs (1) | 52 |  |  | 36 |  |  | Various
El Salvador energy pass through costs recovery | 39 |  |  | — |  |  | Various
AES Ohio regulatory compliance costs (1) | 33 |  |  | 45 |  |  | 2028
Other | 143 |  |  | 108 |  |  | Various
Total noncurrent regulatory assets | 791 |  |  | 698 |  |  |
Total regulatory assets | $ | 1,122 |  |  | $ | 963 |  |  |
Regulatory liabilities |  |  |  |  |
Current regulatory liabilities: |  |  |  |  |
Overcollection of costs to be passed back to customers | $ | 18 |  |  | $ | 34 |  |  | 2025
Other | 4 |  |  | 7 |  |  | 2025
Total current regulatory liabilities | 22 |  |  | 41 |  |  |
Noncurrent regulatory liabilities: |  |  |  |  |
AES Indiana and AES Ohio accrued costs of removal and AROs | 465 |  |  | 586 |  |  | Life of assets
AES Indiana and AES Ohio income taxes payable to customers through rates | 93 |  |  | 117 |  |  | Various
Other | 5 |  |  | 6 |  |  | Various
Total noncurrent regulatory liabilities | 563 |  |  | 709 |  |  |
Total regulatory liabilities | $ | 585 |  |  | $ | 750 |  |  |
_____________________________ (1)Past expenditures on which the Company earns a rate of return. (2)AES Indiana acquired the Hoosier Wind project in February 2024. See Note 26—Acquisitions for further information.

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