Investments and Advances (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	$ 26,578	$ 26,335
Other at or below cost	[1]	532	577
Total investments and advances	[1]	27,110	26,912
Equity in Earnings		4,684	7,098	$ 7,527
Investments and Advances [Member] | United States [Member]
Schedule of Equity Method Investments [Line Items]
Total investments and advances	[1]	6,863	6,787
Investments and Advances [Member] | International [Member]
Schedule of Equity Method Investments [Line Items]
Total investments and advances	[1]	20,247	20,125
Equity in Earnings [Member] | United States [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings		1,342	1,623	1,294
Equity in Earnings [Member] | International [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings		3,342	5,475	6,233
Upstream [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	16,703	16,110
Equity in Earnings		2,218	4,713	5,812
Upstream [Member] | Tengizchevroil LLP [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	8,077	7,319
Equity in Earnings		1,939	4,392	4,957
Upstream [Member] | Petropiar [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	679	794
Equity in Earnings		180	26	339
Upstream [Member] | Caspian Pipeline Consortium [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	1,342	1,487
Equity in Earnings		162	191	113
Upstream [Member] | Petroboscan [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	1,163	917
Equity in Earnings		219	186	300
Upstream [Member] | Angola LNG Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	3,284	3,277
Equity in Earnings		(417)	(311)	(111)
Upstream [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	2,158	2,316
Equity in Earnings		135	229	214
Downstream [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	9,893	10,192
Equity in Earnings		2,469	2,389	1,926
Downstream [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	1,077	1,048
Equity in Earnings		186	180	199
Downstream [Member] | GS Caltex Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	3,620	2,867
Equity in Earnings		824	420	132
Downstream [Member] | Chevron Phillips Chemical Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	5,196	5,116
Equity in Earnings		1,367	1,606	1,371
Downstream [Member] | Caltex Australia Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	0	1,161
Equity in Earnings		92	183	224
All Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	[1]	(18)	33
Equity in Earnings		$ (3)	$ (4)	$ (211)

[1] 2014 conformed to 2015 presentation