Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Capitalization of pension and OPEB expense			$ 8	$ 8
Pension remeasurement gain	$ 44	$ (72)	44	2
OPEB remeasurement gain (loss)	0	18	(8)	27
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to plans			62
Pension remeasurement gain		(72)	44	2
Increase in plan assets			99
Plan assets	$ 2,427		2,427		$ 2,328
Investment returns			119
Benefit payments			82
Pension special termination benefit enhancements		4		10
OPEB [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
OPEB remeasurement gain (loss)		$ 18	$ (8)	$ 27