10-K Retirement Benefits (Components Of Net Periodic Benefit Cost (Benefit Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ 28	$ 26	$ 29
Settlement Loss, Statement of Income or Comprehensive Income Location	Operating expense	Operating expense	Operating expense
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	52	34	$ 47
Expected return on assets	(101)	(134)	(138)
Recognized actuarial loss	16	25	24
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	28	26	29
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(5)	(49)	(38)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1
Interest cost	7	5	10
Expected return on assets	(26)	(26)	(25)
Amortization of prior service credit	(4)	(4)	(7)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (23)	$ (24)	$ (21)