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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Comprehensive Statement Of Earnings) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivatives, Fair Value [Line Items]        
Net gain (losses) recognized in comprehensive statements of earnings $ 804 $ (168) $ 43 $ (65)
Commodity Derivatives [Member]
       
Derivatives, Fair Value [Line Items]        
Net gain (losses) recognized in comprehensive statements of earnings 748 (141) 29 (95)
Interest Rate Derivatives [Member]
       
Derivatives, Fair Value [Line Items]        
Net gain (losses) recognized in comprehensive statements of earnings   1 1 1
Foreign Currency Derivatives [Member]
       
Derivatives, Fair Value [Line Items]        
Net gain (losses) recognized in comprehensive statements of earnings 55 (28) 15 29
EnLink [Member] | Commodity Derivatives [Member]
       
Derivatives, Fair Value [Line Items]        
Net gain (losses) recognized in comprehensive statements of earnings $ 1   $ (2)