Pension and Other Benefit Programs (Schedule of Defined Asset Allocation) (Details)		Dec. 31, 2020	Dec. 31, 2019
Long Duration Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Weight		90.00%
Position	[1]	89.00%	69.00%
Equities Real Estate And Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Weight		10.00%
Position	[1]	11.00%	30.00%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Position	[1]		1.00%

[1] Investments in collective trust funds as of December 31, 2020 and 2019 have been categorized within the asset classes above based on the underlying investments in those funds.