Employee Benefit Plans (Assumed Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Assumed annual increases in Medicare Part B trends after eight years	4.50%	4.50%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Assumed annual increases in Medicare Part B trends for next eight years	4.21%	2.87%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Assumed annual increases in Medicare Part B trends for next eight years	7.19%	6.06%