Employee Benefit Plans (Schedule of Net Change In Pension And Other Postretirement Plan Assets Included in Level 3 Fair Value) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Pension Benefits
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at beginning of year	$ 9,087
Fair value of plan assets at end of year	8,478
Pension Benefits | Level 3
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Purchases	11
Transfers into Level 3	73
Fair value of plan assets at end of year	84
Other Postretirement Benefits
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at beginning of year	2,062
Fair value of plan assets at end of year	2,203
Other Postretirement Benefits | Level 3
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Purchases	1
Transfers into Level 3	5
Fair value of plan assets at end of year	$ 6