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Derivative Financial Instruments (Schedule Of Open NGL Derivative Positions) (Details)
 6 Months Ended
Jun. 30, 2021
$ / bbl
bbl
OPIS Mont Belvieu Texas Natural Gasoline Price Swaps NGL Q2-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (Bbls/d) | bbl 1,000
Weighted Average Price Swap | $ / bbl 47.57
OPIS Mont Belvieu Texas Normal Butane Price Swaps NGL Q2-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (Bbls/d) | bbl 1,000
Weighted Average Price Swap | $ / bbl 31.40
OPIS Mont Belvieu Texas Propane Price Swaps NGL Q2-Q4 2021 [Member]  
Derivatives, Fair Value [Line Items]  
Volume Per Day (Bbls/d) | bbl 1,000
Weighted Average Price Swap | $ / bbl 27.88