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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
Investment Tax Credit	$ 179	$ 94	$ 67
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%	21.00%	21.00%
Operating Loss Carryforwards, Valuation Allowance	$ 20	$ 19
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	12	$ 11	$ 8
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 8

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- Definition

Income Taxes [Abstract]

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits.

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The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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