Employee Retirement Benefits (Benefit Obligation Activity Using An Actuarial Measurement Date For Qualified Plan And SERP) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in projected benefit obligation:
Benefit obligation, January 1	$ 362	$ 387
Service cost	9	10	$ 9
Interest cost	10	10	12
Actuarial gain	(70)	(5)
Benefits paid	(29)	(41)
Other	0	1
Projected benefit obligation, December 31	282	362	387
Change in plan assets:
Fair value of plan assets, January 1	397	357
Actual return on plan assets	(36)	78
Employer contribution	0	3
Benefits paid	(29)	(41)
Fair value of plan assets, December 31	332	397	$ 357
Funded status:
Funded status, December 31	50	35
Accumulated benefit obligation	$ 264	$ 338