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Retirement Plans (Projected Benefit Obligation, Fair Values Of Plan Assets And Amounts Recognized In The Balance Sheet) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in the consolidated balance sheet
Pension and other postretirement benefits - current	$ (39)	$ (38)
Pension and other postretirement benefits - noncurrent	(591)	(697)
Pension [Member]
Change in projected benefit obligation (PBO)
PBO at beginning of the period	2,442	2,510
Service cost	47	51	$ 69
Interest cost	126	129	106
Actuarial gain	(5)	(44)	(867)
Benefits paid	(187)	(204)
Special/contractual termination benefits	12
Settlements	0
PBO at end of the period	2,435	2,442	2,510
Change in plan assets
Fair value of plan assets at beginning of the period	2,268	2,033
Actual return on plan assets, net of expenses	114	305
Employer contribution	133	134
Benefits paid	(187)	(204)
Fair value of plan assets at end of the period	2,328	2,268	2,033
Funded status	(107)	(174)
Amounts recognized in the consolidated balance sheet
Pension and other postretirement benefits - current
Pension and other postretirement benefits - noncurrent	(107)	(174)
Accumulated other comprehensive gain
OPEB [Member]
Change in projected benefit obligation (PBO)
PBO at beginning of the period	561	606
Service cost	7	8	13
Interest cost	28	31	31
Plan amendments		(45)
Plan participants' contributions	10	11
Actuarial gain	(35)	3	(248)
Benefits paid	(48)	(53)
PBO at end of the period	523	561	606
Change in plan assets
Fair value of plan assets at beginning of the period
Plan participants' contributions	10	11
Employer contribution	38	42
Benefits paid	(48)	(53)
Fair value of plan assets at end of the period
Funded status	(523)	(561)
Amounts recognized in the consolidated balance sheet
Pension and other postretirement benefits - current	(39)	(38)
Pension and other postretirement benefits - noncurrent	(484)	(523)
Accumulated other comprehensive gain	$ (100)	$ (125)	$ (102)

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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