Investments and Advances (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity [Line Items]
Term of joint venture Tengizchevroil in years	40 years
Percentage of affiliate by summarized financial information	100.00%
Investments and advances	$ 24,878	$ 23,068
The portion of equity ownership interest held in CP Chemical by Conoco Phillips Corporation	50.00%
The portion of equity ownership interest of Caltex Australia Ltd. held by public	50.00%
Fair value of Chevron share in Caltex Australia Ltd common stock	2,400
Sale and other operating revenues from affiliated companies	14,635	17,356	20,164
Purchased crude oil and products	134,696	140,766	149,923
Accounts and notes receivable due from affiliated companies	1,328	1,207
Accounts payable due to affiliated companies	466	407
Chevron's loan to affiliates	1,129	1,494	957
Affiliated Entity [Member]
Variable Interest Entity [Line Items]
Purchased crude oil and products	7,063	6,634	7,489
Tengizchevroil LLP [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%
Chevron investment carrying value over underlying equity in TCO's net assets	160
Petropiar [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	30.00%
Chevron investment carrying value less underlying equity in Petropiar net assets	170
Caspian Pipeline Consortium [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	15.00%
Long term loans of Caspian Pipeline Consortium included in investments and advances	1,251
Percentage of Caspian Pipeline Consortium pipeline construction funded by Loans	30.00%
Petroboscan [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	39.00%
Chevron investment carrying value over underlying equity in Petroboscan's net assets	180
Angola LNG Limited [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	36.00%
GS Caltex Corporation [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%
Chevron Phillips Chemical Company LLC [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%
Caltex Australia Limited [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%
Tengizchevroil LLP [Member]
Variable Interest Entity [Line Items]
Equity method investment, ownership percentage	50.00%
Percentage of affiliate by summarized financial information	100.00%
Upstream [Member]
Variable Interest Entity [Line Items]
Investments and advances	15,664	14,695
Upstream [Member] | Tengizchevroil LLP [Member]
Variable Interest Entity [Line Items]
Investments and advances	5,875	5,451
Upstream [Member] | Petropiar [Member]
Variable Interest Entity [Line Items]
Investments and advances	858	952
Upstream [Member] | Caspian Pipeline Consortium [Member]
Variable Interest Entity [Line Items]
Investments and advances	1,298	1,187
Upstream [Member] | Petroboscan [Member]
Variable Interest Entity [Line Items]
Investments and advances	1,375	1,261
Upstream [Member] | Angola LNG Limited [Member]
Variable Interest Entity [Line Items]
Investments and advances	3,423	3,186
Upstream [Member] | Other [Member]
Variable Interest Entity [Line Items]
Investments and advances	2,835	2,658
Notes Payable to Banks [Member] | Petroboscan's Draw Down [Member]
Variable Interest Entity [Line Items]
Chevron's loan to affiliates	$ 2,000
Hamaca [Member]
Variable Interest Entity [Line Items]
Term of joint venture with Petropiar (in years)	25 years
Equity ownership portion of Chevron in Hamaca project	30.00%