Pension And Postretirement Benefits (Change In The Value Of Plan Assets And The Plans' Funded Status) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		$ 30,098,000,000	$ 40,874,000,000
Actual return on plan assets		265,000,000	1,791,000,000
Benefits paid, including settlements		(2,447,000,000)	(4,863,000,000)
Contributions	$ 0	3,000,000	0
Group annuity contract transfer		0	(7,704,000,000)
Fair value of plan assets at end of year		27,919,000,000	30,098,000,000
Unfunded status at end of year		(3,025,000,000)	(3,129,000,000)
Postretirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		1,763,000,000	2,160,000,000
Actual return on plan assets		117,000,000	227,000,000
Benefits paid, including settlements		(736,000,000)	(624,000,000)
Contributions		0	0
Group annuity contract transfer		0	0
Fair value of plan assets at end of year		1,144,000,000	1,763,000,000
Unfunded status at end of year		$ (5,195,000,000)	$ (4,930,000,000)