Oil Refinery (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating Revenue	$ 10,621		$ 9,707		$ 19,537		$ 18,207
Operating Income (Loss)	1,579		914		2,199		1,136
Interest Expense, Net	155		172		320		350
Depreciation and amortization	451		415		893		820
Total assets, end of period	52,191		45,772		52,191		45,772		52,252
Capital Expenditures	518		338		1,132		985
Airline [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	1,566		965		2,227		1,209
Interest Expense, Net	155		172		320		350
Depreciation and amortization	445		411		882		812
Total assets, end of period	50,948		44,567		50,948		44,567
Capital Expenditures	511		332		1,103		973
Refinery [Member]
Segment Reporting Information [Line Items]
Operating Revenue	2,018		1,864		3,481		3,595
Operating Income (Loss)	13		(51)		(28)		(73)
Interest Expense, Net	0		0		0		0
Depreciation and amortization	6		4		11		8
Total assets, end of period	1,243		1,205		1,243		1,205
Capital Expenditures	7		6		29		12
Sales to airline segment [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(387)	[1]	(315)	[1]	(636)	[1]	(607)	[1]
Exchanged products [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(1,524)	[2]	(1,347)	[2]	(2,527)	[2]	(2,668)	[2]
Sales of refined products to third parties [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	$ (107)	[3]	$ (202)	[3]	$ (318)	[3]	$ (320)	[3]

[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, which is New York Harbor, for jet fuel from the refinery.

[2] Represents value of products delivered under our strategic agreements, as discussed above, determined on a market price basis.

[3] Represents sales of refined products to third parties. These sales were at or near cost; accordingly, the margin on these sales is de minimis.