Benefit Plans (Components of net periodic cost (benefit)) (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Interest cost on projected benefit obligation	$ 16	$ 16	$ 33	$ 31
Expected return on plan assets	(38)	(39)	(76)	(77)
Amortization of net actuarial (gain) loss	8	11	15	23
Settlement loss	0	1	0	1
Total net periodic pension cost (benefit)	$ (14)	$ (11)	$ (28)	$ (22)