Debt And Related Expenses (Schedule Of Debt Maturities) (Details) - Coterra [Member] $ in Millions	May 07, 2026 USD ($)
Debt Instrument [Line Items]
Face Value	$ 3,505
Fair value	3,500
3.77% due 2026 [Member]
Debt Instrument [Line Items]
Face Value	249
Fair value	$ 250
Maturity Date	Sep. 18, 2026
Debt interest rate, stated percentage	3.77%
3.90% due 2027 [Member]
Debt Instrument [Line Items]
Face Value	$ 747
Fair value	$ 750
Maturity Date	May 15, 2027
Debt interest rate, stated percentage	3.90%
4.375% due 2029 [Member]
Debt Instrument [Line Items]
Face Value	$ 499
Fair value	$ 500
Maturity Date	Mar. 15, 2029
Debt interest rate, stated percentage	4.375%
5.60% due 2034 [Member]
Debt Instrument [Line Items]
Face Value	$ 516
Fair value	$ 500
Maturity Date	Mar. 15, 2034
Debt interest rate, stated percentage	5.60%
5.40% due 2035 [Member]
Debt Instrument [Line Items]
Face Value	$ 762
Fair value	$ 750
Maturity Date	Feb. 15, 2035
Debt interest rate, stated percentage	5.40%
5.90% due 2055 [Member]
Debt Instrument [Line Items]
Face Value	$ 732
Fair value	$ 750
Maturity Date	Feb. 15, 2055
Debt interest rate, stated percentage	5.90%