Oil Refinery (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total Operating Revenue	$ 9,076	$ 10,490	$ 9,707	$ 8,500	$ 8,602	$ 9,923	$ 9,732	$ 8,413	$ 37,773	$ 36,670	$ 35,115
Operating Income (Loss)	701	1,563	914	222	352	1,308	134	382	3,400	2,175	1,975
Interest Expense, net									698	812
Depreciation and amortization expense									1,658	1,565
Total assets	52,252				44,550				52,252	44,550
Capital expenditures									2,568	1,968
Airline [Member]
Segment Reporting Information [Line Items]
Total Operating Revenue									37,773	36,670
Operating Income (Loss)									3,516	2,238
Interest Expense, net									698	812
Depreciation and amortization expense									1,641	1,561
Total assets	51,080				43,386				51,080	43,386
Capital expenditures									2,516	1,637
Refinery [Member]
Segment Reporting Information [Line Items]
Total Operating Revenue									7,003	1,347
Operating Income (Loss)									(116)	(63)
Interest Expense, net									0	0
Depreciation and amortization expense									17	4
Total assets	1,172				1,164				1,172	1,164
Capital expenditures									52	331
Sales to airline segment [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Operating Revenue									(1,156)	(213)
Exchanged products [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Operating Revenue									(5,352)	(1,121)
Sales of refined products to third parties [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total Operating Revenue									$ (495)	$ (13)