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