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Senior Notes (Schedule Of Outstanding Senior Notes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Consolidated Balance Sheet Amount	$ 2,347,000,000	$ 2,346,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Original Principal Amount	2,400,000,000
Consolidated Balance Sheet Amount	2,347,000,000	2,346,000,000
Market Value	$ 1,647,000,000	2,542,000,000
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	397,000,000	397,000,000
Market Value	$ 343,000,000	504,000,000
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	981,000,000	980,000,000
Market Value	$ 677,000,000	1,055,000,000
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	969,000,000	969,000,000
Market Value	$ 627,000,000	$ 983,000,000
Debt instrument, stated interest rate	3.125%

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