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Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Consolidated Balance Sheet Amount	$ 2,346,147,000	$ 2,345,800,000
Senior Notes [Member]
Debt Instrument [Line Items]
Original Principal Amount	2,400,000,000
Consolidated Balance Sheet Amount	2,346,147,000	2,345,800,000
Market Value	$ 2,165,348,000	2,541,500,000
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Date issued	Jun. 05, 2014
Date due	Jun. 01, 2044
Original Principal Amount	$ 400,000,000
Consolidated Balance Sheet Amount	397,343,000	397,314,000
Market Value	$ 437,148,000	503,840,000
Debt instrument, stated interest rate	4.868%
Senior Notes [Member] | 3.5% Senior Notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 07, 2020
Date due	Oct. 15, 2050
Original Principal Amount	$ 1,000,000,000
Consolidated Balance Sheet Amount	980,178,000	980,046,000
Market Value	$ 895,420,000	1,054,520,000
Debt instrument, stated interest rate	3.50%
Senior Notes [Member] | 3.125% Senior Notes due 10/15/2052 [Member]
Debt Instrument [Line Items]
Date issued	Oct. 04, 2021
Date due	Oct. 15, 2052
Original Principal Amount	$ 1,000,000,000
Consolidated Balance Sheet Amount	968,626,000	968,440,000
Market Value	$ 832,780,000	$ 983,140,000
Debt instrument, stated interest rate	3.125%

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