Benefit Plans (Components of net periodic cost (benefit)) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 25	$ 17	$ 74	$ 50
Expected return on plan assets	(29)	(38)	(89)	(114)
Amortization of net actuarial loss	7	8	24	23
Total net periodic pension cost (benefit)	$ 3	$ (13)	$ 9	$ (41)