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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Interest expense incurred $ 86 $ 62 $ 28
4.868% Senior Notes due 6/1/2044 [Member]      
Debt Instrument [Line Items]      
Interest expense incurred $ 19 19 19
Debt instrument, stated interest rate 4.868%    
3.5% Senior Notes due 10/15/2050 [Member]      
Debt Instrument [Line Items]      
Interest expense incurred $ 35 35 8
Debt instrument, stated interest rate 3.50%    
3.125% Senior Notes due 10/15/2052 [Member]      
Debt Instrument [Line Items]      
Interest expense incurred $ 32 $ 8
Debt instrument, stated interest rate 3.125%