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Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - Senior Notes [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
4.868% Senior notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 05, 2014
Date due	Jun. 01, 2044
Principal Amounts	$ 400,000,000
Consolidated Balance Sheet Amount	397,194,000	$ 397,074,000
Market Value	$ 528,000,000	452,848,000
3.5% Senior notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 07, 2020
Date due	Oct. 15, 2050
Principal Amounts	$ 1,000,000,000
Consolidated Balance Sheet Amount	979,524,000
Market Value	$ 1,138,100,000

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