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Related Parties (Net Intercompany Payables) (Details) - Related Party [Member] - Corporate Services [Member] - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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IPL [Member] |  |
Related Party Transactions [Line Items] |  |
Net amounts owed | $ 138 | $ 129
WPL [Member] |  |
Related Party Transactions [Line Items] |  |
Net amounts owed | $ 67 | $ 72

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