Benefit Plans (Components of Net Periodic Cost (Benefit)) (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 67	$ 62	$ 80
Expected return on plan assets	(152)	(154)	(155)
Amortization of net actuarial loss (gain)	30	46	45
Settlement loss	0	1	3
Total net periodic pension cost (benefit)	$ (55)	$ (45)	$ (27)