Retirement Benefits (Reconciliation Of The Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits [Member]
Reconciliation of benefit obligation
Benefit obligation at beginning of year	$ 1,859	$ 2,009
Service cost	0	0
Interest cost	52	34	$ 47
Plan participant contributions	0	0
Actuarial loss (gain)	(362)	(33)
Settlements	(74)	(90)
Benefits paid	(60)	(61)
Benefit obligation at end of year	1,415	1,859	2,009
Other Benefits [Member]
Reconciliation of benefit obligation
Benefit obligation at beginning of year	343	399
Service cost	0	1	1
Interest cost	7	5	10
Plan participant contributions	17	17
Actuarial loss (gain)	(54)	(31)
Settlements	0	0
Benefits paid	(36)	(48)
Benefit obligation at end of year	$ 277	$ 343	$ 399