Operating Segments and Geographic Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Segment Earnings	$ (1,470)	$ 571	$ (2,195)	$ 3,138
Upstream [Member]
Segment Reporting Information [Line Items]
Segment Earnings	(2,462)	(2,219)	(3,921)	(659)
Downstream [Member]
Segment Reporting Information [Line Items]
Segment Earnings	1,278	2,956	2,013	4,379
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment Earnings	(1,184)	737	(1,908)	3,720
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Segment Earnings	(1,113)	(1,038)	(1,963)	(1,498)
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Segment Earnings	(1,349)	(1,181)	(1,958)	839
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Segment Earnings	537	731	784	1,437
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Segment Earnings	741	2,225	1,229	2,942
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest Income	17	16	32	32
Other	$ (303)	$ (182)	$ (319)	$ (614)