10-K Retirement Benefits (Net Amounts Included In Accumulated Other Comprehensive Loss That Have Not Been Recognized As Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans, Deferred net actuarial loss	$ (672)	$ (625)
Prior service cost (credit)	0	0
Net amount before tax at December 31	(672)	(625)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans, Deferred net actuarial loss	5	36
Prior service cost (credit)	3	8
Net amount before tax at December 31	$ 8	$ 44