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Fair Value Of Financial Instruments (Changes In Fair Value Of Plan's Level 3 Assets) (Details) - Interest in Limited Partnerships and Limited Liability Corporations [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, beginning of year	$ 162	$ 156
Realized gains	15	13
Unrealized (loss) gain	(1)	6
Purchases
Sales and distributions	(15)	(13)
Balance, end of year	$ 161	$ 162

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales and Distributions

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