Benefit Plans (Components of net periodic cost (benefit)) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 24	$ 16	$ 49	$ 33
Expected return on plan assets	(30)	(38)	(60)	(76)
Amortization of net actuarial loss	9	8	17	15
Total net periodic pension cost (benefit)	$ 3	$ (14)	$ 6	$ (28)