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Senior Notes (Schedule Of Interest Expense Incurred In Connection With Senior Notes) (Details) - Senior Notes [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Interest expense incurred	$ 22	$ 14	$ 65	$ 41
4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 5	5	$ 15	15
Debt instrument, stated interest rate	4.868%		4.868%
3.5% Senior Notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 9	9	$ 26	26
Debt instrument, stated interest rate	3.50%		3.50%
3.125% Senior Notes due 10/15/2052 [Member]
Debt Instrument [Line Items]
Interest expense incurred	$ 8		$ 24
Debt instrument, stated interest rate	3.125%		3.125%

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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