Derivatives (Schedule Of Outstanding Derivatives Entered Into To Hedge Inventory Or Fixed Price Purchase Commitments) (Details) (Not Designated As Hedging Instrument [Member])	6 Months Ended
	Jun. 30, 2014 bbl
Sell (Short) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	613
Weighted average contract price per gal	104.52
Sell (Short) Contracts [Member] | Diesel Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	122
Weighted average contract price per gal	2.98
Sell (Short) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	470
Weighted average contract price per gal	91.25
Sell (Short) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	155
Underlying, Derivative	0.97
Sell (Short) Contracts [Member] | Diesel Options [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	25
Weighted average contract price per gal	2.58
Buy (Long) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	132
Weighted average contract price per gal	105.70
Buy (Long) Contracts [Member] | Diesel Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	2
Weighted average contract price per gal	3.04
Buy (Long) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Weighted average contract price per gal	0.00
Buy (Long) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Underlying, Derivative	0.00
Buy (Long) Contracts [Member] | Diesel Options [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Weighted average contract price per gal	0.00