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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Abstract]
Investment Tax Credit	$ 67	$ 64	$ 94
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%	21.00%	21.00%
Tax Adjustments, Settlements, and Unusual Provisions	$ 149	$ 139	$ 133
Deferred Tax Assets, Net of Valuation Allowance	1,802	603
Deferred Tax Assets, Valuation Allowance	(21)	(29)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	8	7	$ 9
State net operating carryforwards, net of federal tax effect	$ 40	$ 53

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Income Taxes [Abstract]

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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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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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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

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