Oil Refinery (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Business Acquisition, Date of Acquisition Agreement				Jun. 22, 2012
Operating Revenue	$ 9,707		$ 9,732	$ 18,207		$ 18,145
Exchanged products [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	$ (1,347)	[1]		$ (2,668)	[1]

[1] Represents transfers, valued on a market price basis, from the refinery to the airline segment for use in airline operations. We determine market price by reference to the market index for the primary delivery location for jet fuel from the refinery, which is New York harbor.