Pension Plan and Other Postretirement Benefits (Pension and Other Postretirement Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 2
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0
Interest cost	0	1
Expected return on plan assets	(1)	0
Amortization of prior service cost	0	0
Settlement loss	2	0
Net periodic benefit cost	$ 1	$ 1