Oil Refinery (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating Revenue	$ 11,178	$ 10,490	$ 30,715	$ 28,697
Operating Income (Loss)	835	1,563	3,034	2,699
Interest Expense, Net	140	176	460	526
Depreciation and amortization	440	418	1,333	1,238
Total assets, end of period	51,940	45,997	51,940	45,997	52,252
Capital Expenditures	457	631	1,589	1,616
Airline [Member]
Segment Reporting Information [Line Items]
Operating Revenue	11,114	10,490	30,651	28,697
Operating Income (Loss)	816	1,560	3,043	2,769
Interest Expense, Net	140	176	460	526
Depreciation and amortization	433	413	1,315	1,225
Total assets, end of period	50,648	44,823	50,648	44,823
Capital Expenditures	449	618	1,552	1,591
Refinery [Member]
Segment Reporting Information [Line Items]
Operating Revenue	1,836	1,892	5,317	5,487
Operating Income (Loss)	19	3	(9)	(70)
Interest Expense, Net	0	0	0	0
Depreciation and amortization	7	5	18	13
Total assets, end of period	1,292	1,174	1,292	1,174
Capital Expenditures	8	13	37	25
Sales to airline segment [Member] | Intersegment Sales/Other [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(345)	(320)	(981)	(927)
Exchanged Products [Member] | Intersegment Sales/Other [Member]
Segment Reporting Information [Line Items]
Operating Revenue	(1,393)	(1,504)	(3,920)	(4,172)
Sales of refined products to third parties [Member] | Intersegment Sales/Other [Member]
Segment Reporting Information [Line Items]
Operating Revenue	$ (34)	$ (68)	$ (352)	$ (388)