Pension Plan and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
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	$ 1	$ 1	$ 1
Benefit obligation	14		14		$ 13
Pension
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	1	$ 1	2	$ 1
Benefit obligation	$ 13		$ 13		$ 12
Non-Qualified Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Treasury stock acquired (in shares)			1,745		2,035