Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 22	$ 25
Expected return on plan assets	(29)	(30)
Amortization of net actuarial loss	7	8
Total net periodic pension cost (benefit)	$ 0	$ 3