Oil Refinery (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 8,602	$ 9,923	$ 9,732	$ 8,413	$ 8,399	$ 9,816	$ 9,153	$ 7,747	$ 36,670		$ 35,115	$ 31,755
Segment Reporting Information, Intersegment Revenue									(213)	[1]
Inventory Exchanged Under Exchange Agreements									(1,121)	[2]
Revenue from External Customers									(13)	[3]
Operating Income (Loss)	352	1,308	134	382	726	860	481	(92)	2,175		1,975	2,217
Interest Expense									812
Depreciation, Depletion and Amortization, Nonproduction									1,565		1,523	1,511
Assets	44,550				43,499				44,550		43,499
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									1,968
Airline [Member]
Segment Reporting Information [Line Items]
Revenues									36,670
Operating Income (Loss)									2,238
Interest Expense									812
Depreciation, Depletion and Amortization, Nonproduction									1,561
Assets	43,386								43,386
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									1,637
Refinery [Member]
Segment Reporting Information [Line Items]
Revenues									1,347
Operating Income (Loss)									(63)
Interest Expense									0
Depreciation, Depletion and Amortization, Nonproduction									4
Assets	1,164								1,164
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									331
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									0
Interest Expense									0
Depreciation, Depletion and Amortization, Nonproduction									0
Assets	0								0
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets									$ 0

[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.

[2] Represents value of products exchanged under our buy/sell agreements, as discussed above, determined on a market price basis.

[3] Represents sales of refinery by-products to third parties. Such products are generally sold at or near cost; accordingly, margin on such sales is de minimis. By-products are produced as a result of the refining of crude oil into gasoline, diesel and jet fuel.