Derivatives (Schedule Of Outstanding Derivatives Entered Into To Hedge Inventory Or Fixed Price Purchase Commitments) (Details) (Not Designated As Hedging Instrument [Member])	9 Months Ended
	Sep. 30, 2014 bbl
Sell (Short) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	601
Weighted average contract price per gal	95.06
Sell (Short) Contracts [Member] | Diesel Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	100
Weighted average contract price per gal	2.78
Sell (Short) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	435
Weighted average contract price per gal	84.22
Sell (Short) Contracts [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	90
Underlying, Derivative	1.19
Sell (Short) Contracts [Member] | Diesel Options [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	20
Weighted average contract price per gal	2.08
Buy (Long) Contracts [Member] | Crude Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	406
Weighted average contract price per gal	93.67
Buy (Long) Contracts [Member] | Diesel Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	0
Weighted average contract price per gal	0.00
Buy (Long) Contracts [Member] | Fuel Oil Futures [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	50
Weighted average contract price per gal	83.85
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