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Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Consolidated Balance Sheet Amount $ 2,345,800,000 $ 1,376,718,000
Senior Notes [Member]    
Debt Instrument [Line Items]    
Original Principal Amount 2,400,000,000  
Consolidated Balance Sheet Amount 2,345,800,000 1,376,718,000
Market Value $ 2,541,500,000 1,666,100,000
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 397,314,000 397,194,000
Market Value $ 503,840,000 528,000,000
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 980,046,000 979,524,000
Market Value $ 1,054,520,000 1,138,100,000
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 $ 1,000,000,000.0  
Consolidated Balance Sheet Amount 968,440,000
Market Value $ 983,140,000
Debt instrument, stated interest rate 3.125%