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Regulatory Assets and Liabilities (Tables)
 12 Months Ended
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, 20242023
Recovery/Refund Period Ends
Regulatory assets
Current regulatory assets:
Undercollection of rate riders$177 $127 2025
El Salvador energy pass through costs recovery117 119 2025
Other37 19 2025
Total current regulatory assets331 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 costs65 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 recovery39 — Various
AES Ohio regulatory compliance costs (1)
33 45 2028
Other143 108 Various
Total noncurrent regulatory assets791 698 
Total regulatory assets$1,122 $963 
Regulatory liabilities
Current regulatory liabilities:
Overcollection of costs to be passed back to customers$18 $34 2025
Other4 7 2025
Total current regulatory liabilities22 41 
Noncurrent regulatory liabilities:
AES Indiana and AES Ohio accrued costs of removal and AROs465 586 Life of assets
AES Indiana and AES Ohio income taxes payable to customers through rates93 117 Various
Other5 6 Various
Total noncurrent regulatory liabilities563 709 
Total regulatory liabilities$585 $750 
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(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.