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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash equivalents	$ 477		$ 477		$ 52
Cash equivalents weighted-average interest rate, percentage	4.00%		4.00%
Short-term investments	$ 250		$ 250		0
Short-term investments weighted-average interest rate, percentage	4.00%		4.00%
Steam Plant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Asset retirement obligation charge for IPL's steam assets				$ 20
IPL [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash equivalents	$ 194		$ 194		$ 9
Cash equivalents weighted-average interest rate, percentage	4.00%		4.00%
Asset retirement obligation charge for IPL's steam assets	$ 108	$ 96	$ 275	281
IPL [Member] | Steam Plant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Asset retirement obligation charge for IPL's steam assets				$ 20

X

- Definition

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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