Employee Benefit Plans (Narrative) (Details) - Other Postretirement Benefits	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Minimum
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Age		50 years
Deferred Compensation Arrangement with Individual, Requisite Service Period	10 years
Maximum
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Requisite Age		55 years
Deferred Compensation Arrangement with Individual, Requisite Service Period	20 years