Investments and Advances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Investments and Advances	$ 29,789	$ 26,578
Other at or below cost	461	532
Total investments and advances	30,250	27,110
Equity in Earnings	2,661	4,684	$ 7,098
Investments and Advances [Member] | United States [Member]
Schedule of Equity Method Investments [Line Items]
Total investments and advances	7,258	6,863
Investments and Advances [Member] | International [Member]
Schedule of Equity Method Investments [Line Items]
Total investments and advances	22,992	20,247
Equity in Earnings [Member] | United States [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	802	1,342	1,623
Equity in Earnings [Member] | International [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	1,859	3,342	5,475
All Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	(16)	(18)
Equity in Earnings	(4)	(3)	(4)
Upstream [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	19,153	16,703
Equity in Earnings	1,243	2,218	4,713
Upstream [Member] | Tengizchevroil LLP [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	11,414	8,077
Equity in Earnings	1,380	1,939	4,392
Upstream [Member] | Petropiar [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	977	679
Equity in Earnings	326	180	26
Upstream [Member] | Caspian Pipeline Consortium [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	1,245	1,342
Equity in Earnings	145	162	191
Upstream [Member] | Petroboscan [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	982	1,163
Equity in Earnings	(133)	219	186
Upstream [Member] | Angola LNG Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	2,744	3,284
Equity in Earnings	(282)	(417)	(311)
Upstream [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	1,791	2,158
Equity in Earnings	(193)	135	229
Downstream [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	10,652	9,893
Equity in Earnings	1,422	2,469	2,389
Downstream [Member] | GS Caltex Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	3,767	3,620
Equity in Earnings	373	824	420
Downstream [Member] | Chevron Phillips Chemical Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	5,767	5,196
Equity in Earnings	840	1,367	1,606
Downstream [Member] | Caltex Australia Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	0	0
Equity in Earnings	0	92	183
Downstream [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	1,118	1,077
Equity in Earnings	$ 209	$ 186	$ 180