Pension Plan and Other Postretirement Benefits (Narrative) (Details) - USD ($)				1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Apr. 06, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Lump sum payments for settlement			$ 38,000,000
Settlement loss							$ 2,000,000
Defined benefit plan, funded (unfunded) status of plan	$ 13,000,000				$ 13,000,000		13,000,000
Treasury stock acquired (in shares)				2,800,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost							1,000,000	$ 1,000,000
Benefit obligation	10,000,000	$ 9,000,000			10,000,000		10,000,000
Pension
Defined Benefit Plan Disclosure [Line Items]
Settlement loss					0	$ 0	2,000,000	0
Defined benefit plan, funded (unfunded) status of plan	$ 13,000,000	$ 15,000,000			13,000,000		13,000,000
Net periodic benefit cost					$ 0	$ 0	$ 1,000,000	$ 1,000,000
Non-Qualified Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Treasury stock acquired (in shares)	1,455	1,743