Investments and Advances (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Investments and Advances	$ 24,878	$ 23,068
Other at or below cost	624	650
Total investment and advances	25,502	23,718
Equity in Earnings	7,527	6,889	7,363
Investments and Advances [Member] | United States [Member]
Schedule of Equity Method Investments [Line Items]
Total investment and advances	6,638	5,788
Investments and Advances [Member] | International [Member]
Schedule of Equity Method Investments [Line Items]
Total investment and advances	18,864	17,930
Equity in Earnings [Member] | United States [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	1,294	1,268	1,119
Equity in Earnings [Member] | International [Member]
Schedule of Equity Method Investments [Line Items]
Equity in Earnings	6,233	5,621	6,244
Upstream [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	15,664	14,695
Equity in Earnings	5,812	5,154	5,706
Upstream [Member] | Tengizchevroil LLP [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	5,875	5,451
Equity in Earnings	4,957	4,614	5,097
Upstream [Member] | Petropiar [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	858	952
Equity in Earnings	339	55	116
Upstream [Member] | Caspian Pipeline Consortium [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	1,298	1,187
Equity in Earnings	113	96	122
Upstream [Member] | Petroboscan [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	1,375	1,261
Equity in Earnings	300	229	247
Upstream [Member] | Angola LNG Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	3,423	3,186
Equity in Earnings	(111)	(106)	(42)
Upstream [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	2,835	2,658
Equity in Earnings	214	266	166
Downstream [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	8,839	7,733
Equity in Earnings	1,926	1,750	1,608
Downstream [Member] | Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	989	837
Equity in Earnings	199	196	183
Downstream [Member] | GS Caltex Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	2,518	2,610
Equity in Earnings	132	249	248
Downstream [Member] | Chevron Phillips Chemical Company LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	4,312	3,451
Equity in Earnings	1,371	1,206	985
Downstream [Member] | Star Petroleum Refining Company Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	0	0
Equity in Earnings	0	22	75
Downstream [Member] | Caltex Australia Limited [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	1,020	835
Equity in Earnings	224	77	117
All Other [Member]
Schedule of Equity Method Investments [Line Items]
Investments and Advances	375	640
Equity in Earnings	$ (211)	$ (15)	$ 49