Commitments and Contingencies (Narrative 1) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Percentage Of Employees Represented By Unions Under Collective Bargaining Agreements	18.00%
Required Cash Reserve for Credit Card Agreements	$ 0	$ 0
Required Amount of Withholding of Payments for Credit Card Agreements	0	0
Cash Reserve for Credit Card Processing Agreements	0	0
Amount Withheld for Credit Card Processing Agreements	$ 0	$ 0
All Employees [Member]
Entity Number of Employees	78,000
Refinery Employees [Member]
Entity Number of Employees	210