Segments and Geographic Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information, Profit (Loss)
Operating revenue	$ 9,458	$ 10,483	$ 10,447	$ 9,251	$ 9,502	$ 11,107	$ 10,707	$ 9,388	$ 39,639	$ 40,704	$ 40,362
Operating income (loss)	1,020	$ 1,969	$ 2,423	$ 1,540	1,717	$ 2,213	$ 2,474	$ 1,398	6,952	7,802	2,206
Interest expense, net									388	481	650
Depreciation and amortization									1,902	1,835	1,771
Total assets	51,261				53,134				51,261	53,134	54,005
Capital expenditures									3,391	2,945	2,249
Sales to airline segment | Intersegment Sales/Other
Segment Reporting Information, Profit (Loss)
Operating revenue									(695)	(990)	(1,313)
Exchanged products | Intersegment Sales/Other
Segment Reporting Information, Profit (Loss)
Operating revenue									(2,658)	(3,108)	(5,104)
Sales of refined products | Intersegment Sales/Other
Segment Reporting Information, Profit (Loss)
Operating revenue									(257)	(337)	(397)
Airline | Operating Segments
Segment Reporting Information, Profit (Loss)
Operating revenue									39,406	40,398	40,217
Operating income (loss)									7,077	7,512	2,110
Interest expense, net									386	481	650
Depreciation and amortization									1,862	1,805	1,745
Total assets	49,930				51,785				49,930	51,785	52,896
Capital expenditures									3,270	2,853	2,184
Refinery | Operating Segments
Segment Reporting Information, Profit (Loss)
Operating revenue									3,843	4,741	6,959
Operating income (loss)									(125)	290	96
Interest expense, net									2	0	0
Depreciation and amortization									40	30	26
Total assets	$ 1,331				$ 1,349				1,331	1,349	1,109
Capital expenditures									$ 121	$ 92	$ 65