Pension Plan and Other Postretirement Benefits (Narrative) (Details) - USD ($)				3 Months Ended		9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Apr. 06, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 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	$ 14,000,000			$ 14,000,000		14,000,000
Treasury stock acquired (in shares)					10,800,000		13,600,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost				1,000,000	$ 1,000,000	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	$ 0	$ 15,000,000		0		0
Net periodic benefit cost				$ 0	$ 1,000,000	$ 1,000,000	$ 2,000,000
Non-Qualified Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Treasury stock acquired (in shares)	1,455	1,743