Fair Value Of Financial Instruments (Changes In Fair Value Of Plan's Level 3 Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Reorganization Items
Interest in Limited Partnerships and Limited Liability Corporations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, beginning of year	$ 165	$ 166
Realized gains	14	22
Unrealized gains	(9)	(1)
Purchases		1
Sales and distributions	(14)	(23)
Balance, end of year	$ 156	$ 165