Operating Segments and Geographic Data (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Segment Earnings	$ 4,047	$ 1,952	$ 11,094	$ 6,084
Operating Segments
Segment Reporting Information [Line Items]
Segment Earnings	4,752	2,303	12,965	6,794
Operating Segments \| Upstream
Segment Reporting Information [Line Items]
Segment Earnings	3,379	489	10,026	2,859
Operating Segments \| Upstream \| United States
Segment Reporting Information [Line Items]
Segment Earnings	828	(26)	2,314	(48)
Operating Segments \| Upstream \| International
Segment Reporting Information [Line Items]
Segment Earnings	2,551	515	7,712	2,907
Operating Segments \| Downstream
Segment Reporting Information [Line Items]
Segment Earnings	1,373	1,814	2,939	3,935
Operating Segments \| Downstream \| United States
Segment Reporting Information [Line Items]
Segment Earnings	748	640	1,847	1,743
Operating Segments \| Downstream \| International
Segment Reporting Information [Line Items]
Segment Earnings	625	1,174	1,092	2,192
All Other
Segment Reporting Information [Line Items]
Interest expense	(171)	(30)	(524)	(115)
Interest income	37	13	84	42
Other	$ (571)	$ (334)	$ (1,431)	$ (637)

Segment earnings, other income (expense).

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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