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Debt And Related Expenses (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
Repayments of long-term debt	$ 0	$ 0	$ 0	$ 1,243
Early retirement of debt	0	0	0	(30)
Charge on early retirement of debt, noncash charges	0	0	0	59
Interest Income. Received	19	$ 1	22	2
Devon and WPX Agreement [Member]
Debt Instrument [Line Items]
Interest Income. Received	7
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	2,330		2,330
Outstanding letters of credit	$ 2		$ 2
Senior Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt-to-capitalization ratio	0.65		0.65
Senior Notes [Member]
Debt Instrument [Line Items]
Early retirement of debt				30
Charge on early retirement of debt, cash retirement costs				89
Charge on early retirement of debt, noncash charges				59
6.00% Due 2022 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt				$ 43
Debt interest rate, stated percentage		6.00%		6.00%
5.875% Due 2028 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt				$ 175
Debt interest rate, stated percentage		5.875%		5.875%
4.5% Due 2030 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt				$ 315
Debt interest rate, stated percentage		4.50%		4.50%
5.75% due June 1, 2026 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt				$ 500
Debt interest rate, stated percentage		5.75%		5.75%
5.25% Due 2027 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Repayments of long-term debt				$ 210
Debt interest rate, stated percentage		5.25%		5.25%

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