10-K Retirement Benefits (Changes In Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Change in fair value of plan assets
Total pension benefit assets	$ 2,216	$ 2,186
Actual return on plan assets	(352)	174
Employer contributions	4	7
Plan participant contributions	0	0
Settlements	(74)	(90)
Benefits paid	(60)	(61)
Total pension benefit assets	1,734	2,216
Other Benefits [Member]
Change in fair value of plan assets
Total pension benefit assets	371	391
Actual return on plan assets	(61)	33
Employer contributions	0	0
Plan participant contributions	17	17
Settlements	0	(29)
Benefits paid	(28)	(41)
Total pension benefit assets	$ 299	$ 371