Pension Plan and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, lump sum payment distribution, percentage of pension assets		40.00%
Settlement loss			$ 2
Defined benefit plan, funded (unfunded) status of plan	$ 13		13
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost			1	$ 1
Benefit obligation	10	$ 9	10
Pension
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			2	0
Defined benefit plan, funded (unfunded) status of plan	$ 13	$ 15	13
Net periodic benefit cost			$ 1	$ 1
Non-Qualified Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Treasury stock acquired (in shares)	1,455	1,743