Pension Plan and Other Postretirement Benefits (Pension and Other Postretirement Benefit Costs) (Details) - Pension - 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]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1	1	2	2
Expected return on plan assets	0	(2)	0	(3)
Amortization of prior service cost	1	0	(1)	0
Settlement loss	0	1	0	1
Net periodic benefit cost	$ 0	$ 0	$ 1	$ 0