Retirement Benefits (Funded Status Of Benefit Plans And Amounts Included In Regulatory Assets And OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in plan assets:
Funded status – surplus	$ (734)	$ (551)
Accrued benefit asset at December 31	(734)	(551)
Amounts recognized in the balance sheet consist of:
Noncurrent asset	(757)	(581)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation at end of year	3,962	4,102
Change in benefit obligation:
Net benefit obligation at beginning of year	4,258	4,061
Service cost	88	79	$ 128
Interest cost	222	221	163
Participant contributions	0	0
Actuarial (gain) loss	(143)	170
Benefits paid	(291)	(273)
Net benefit obligation at end of year	4,134	4,258	4,061
Change in plan assets:
Fair value of plan assets at beginning of year	4,272	4,027
Actual return on plan assets	193	514
Employer contributions	8	4	5
Participant contributions	0	0
Benefits paid	(291)	(273)
Fair value of plan assets at end of year	4,182	4,272	4,027
Funded status – surplus	(48)	(14)
Accrued benefit asset at December 31	(48)	(14)
Amounts recognized in the balance sheet consist of:
Noncurrent asset	(71)	(44)
Liability, Defined Benefit Plan, Current	2	2
Liability, Defined Benefit Plan, Noncurrent	21	28
Amounts recognized in regulatory assets or liabilities consist of:
Net actuarial (gain) loss	42	(10)
Prior service credit	0	0
Amounts recognized in accumulated OCI (pretax) consist of:
Net actuarial (gain) loss	26	22
Total	68	12
Postretirement Benefits
Change in benefit obligation:
Net benefit obligation at beginning of year	856	838
Service cost	12	12	20
Interest cost	44	45	34
Participant contributions	7	7
Actuarial (gain) loss	(51)	17
Benefits paid	(61)	(63)
Net benefit obligation at end of year	807	856	838
Change in plan assets:
Fair value of plan assets at beginning of year	1,393	1,249
Actual return on plan assets	150	197
Employer contributions	4	3	2
Participant contributions	7	7
Benefits paid	(61)	(63)
Fair value of plan assets at end of year	1,493	1,393	$ 1,249
Funded status – surplus	(686)	(537)
Accrued benefit asset at December 31	(686)	(537)
Amounts recognized in the balance sheet consist of:
Noncurrent asset	(686)	(537)
Liability, Defined Benefit Plan, Current	0	0
Liability, Defined Benefit Plan, Noncurrent	0	0
Amounts recognized in regulatory assets or liabilities consist of:
Net actuarial (gain) loss	(379)	(311)
Prior service credit	(21)	(25)
Amounts recognized in accumulated OCI (pretax) consist of:
Net actuarial (gain) loss	(7)	(4)
Total	$ (407)	$ (340)