Pension And Other Benefit Programs (Schedule Of Defined Asset Allocation) (Details)	Dec. 31, 2019		Dec. 31, 2018
Long Duration Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Weight	70.00%
Position	69.00%	[1]	62.00%
Equities Real Estate And Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Weight	30.00%
Position	30.00%	[1]	30.00%
High Yield Bonds And Real Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Position			2.00%
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Position	1.00%	[1]	6.00%

[1] Investments in collective trust funds as of December 31, 2019 and 2018 have been categorized within the asset classes above based on the underlying investments in those funds.