Oil Refinery (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Operating Revenue	$ 10,490	$ 9,923	$ 28,697	$ 28,068
Operating Income (Loss)	1,563	1,308	2,699	1,824
Interest Expense, Net	176		526
Depreciation and amortization	418	392	1,238	1,166
Total assets	45,997		45,997		44,550
Capital Expenditures	631		1,616
Airline [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	1,560		2,769
Interest Expense, Net	176		526
Depreciation and amortization	413		1,225
Total assets	44,823		44,823
Capital Expenditures	618		1,591
Refinery [Member]
Segment Reporting Information [Line Items]
Operating Revenue	1,892		5,487
Operating Income (Loss)	3		(70)
Interest Expense, Net	0		0
Depreciation and amortization	5		13
Total assets	1,174		1,174
Capital Expenditures	13		25
Segment Allocations [Member]
Segment Reporting Information [Line Items]
Derivative, Gain (Loss) on Derivative, Net	36		8
Sales to airline segment [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(320)		(927)
Exchanged products [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(1,504)		(4,172)
Sales of refined products to third parties [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenue	$ (68)		$ (388)