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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Comprehensive Statements Of Earnings) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivatives, Fair Value [Line Items]        
Net gains (losses) recognized in comprehensive statements of earnings $ 481 $ 804 $ 606 $ 43
Commodity Derivatives [Member] | Oil, Gas And NGL Derivatives [Member]        
Derivatives, Fair Value [Line Items]        
Net gains (losses) recognized in comprehensive statements of earnings 414 748 426 29
Commodity Derivatives [Member] | Marketing And Midstream Revenues [Member]        
Derivatives, Fair Value [Line Items]        
Net gains (losses) recognized in comprehensive statements of earnings 6 1 8 (2)
Interest Rate Derivatives [Member] | Other Nonoperating Items [Member]        
Derivatives, Fair Value [Line Items]        
Net gains (losses) recognized in comprehensive statements of earnings (30)   (28) 1
Foreign Currency Derivatives [Member] | Other Nonoperating Items [Member]        
Derivatives, Fair Value [Line Items]        
Net gains (losses) recognized in comprehensive statements of earnings $ 91 $ 55 $ 200 $ 15