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Debt And Related Expenses (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Aug. 01, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Repayments of long-term debt		$ 242	$ 0	$ 242	$ 0
Interest Income. Received		11	$ 19	43	$ 22
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility, borrowing capacity		3,000		3,000
Outstanding credit facility borrowings		$ 0		$ 0
Debt-to-capitalization ratio		0.219		0.219
Outstanding letters of credit		$ 3		$ 3
Senior Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio		0.65		0.65
8.25% due August 1, 2023 [Member]
Debt Instrument [Line Items]
Debt interest rate, stated percentage		8.25%		8.25%		8.25%
8.25% due August 1, 2023 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 242
Debt interest rate, stated percentage	8.25%

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