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Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Current Regulatory Assets | $ 331 | $ 265
Total Non Current Regulatory Assets | 791 | 698
Total regulatory assets | 1,122 | 963
Total Current Regulatory Liabilities | 22 | 41
Total Non Current Regulatory Liabilities | 563 | 709
Total regulatory liabilities | 585 | 750
Overcollection of Costs [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Current Regulatory Liabilities | 18 | 34
Deferred Income Tax Charge [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Liabilities | 93 | 117
Asset Retirement Obligation Costs |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Liabilities | 465 | 586
Other Regulatory Liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Current Regulatory Liabilities | 4 | 7
Total Non Current Regulatory Liabilities | 5 | 6
El Salvador Tariff Recoveries |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Current Regulatory Assets | 117 | 119
Total Non Current Regulatory Assets | 39 | 0
Pension Costs |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | 183 | 179
Deferred Midwest Independent Service Operator Costs |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | 52 | 36
Environmental Restoration Costs [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | 65 | 70
Other Regulatory Assets |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Current Regulatory Assets | 37 | 19
Total Non Current Regulatory Assets | 143 | 108
Petersburg Unit Retirement Costs |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | 129 | 260
Deferred Fuel and Purchase Power Costs |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | 33 | 45
Uncollection of rate riders |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Current Regulatory Assets | 177 | 127
AES Indiana Credit Agreement due 2027 |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | 53 | 0
Petersburg Unit 3&4 Retirement Costs |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Total Non Current Regulatory Assets | $ 94 | $ 0

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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