Pension And Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Actuarial Gain (Loss)	$ 0	$ 1,053
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit	0	(1,012)
Net periodic benefit (credit) costs	(110)	(398)
Supplemental Retirement and Savings Plans
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit (credit) costs	$ 19	$ 12