Pension and Other Post-Employment Benefits (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement (Benefit) Expense	$ 10	$ 12
Operating Expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement (Benefit) Expense	10	12
Administrative Expense [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement (Benefit) Expense	3	3
Other Nonoperating Income (Expense) [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement (Benefit) Expense	$ (3)	$ (3)