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Investments and Advances (Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]      
Percentage of affiliate by summarized financial information 100.00%    
Investments and advances [1] $ 26,578 $ 26,335  
Related Party Transaction, Other Revenues from Transactions with Related Party 4,850 10,404 $ 14,635
Purchased crude oil and products 69,751 119,671 134,696
Accounts and notes receivable due from affiliated companies 399 924  
Accounts payable due to affiliated companies 286 345  
Chevron's loan to affiliates 410 874 1,129
Affiliated Entity [Member]      
Variable Interest Entity [Line Items]      
Purchased crude oil and products $ 4,240 $ 6,735 $ 7,063
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 $ 150    
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 $ 160    
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 $ 1,098    
Percentage of Caspian Pipeline Consortium pipeline construction funded by Loans 30.00%    
Petroboscan [Member]      
Variable Interest Entity [Line Items]      
Equity method investment, ownership percentage 39.20%    
Chevron investment carrying value over underlying equity in Petroboscan's net assets $ 140    
Angola LNG Limited [Member]      
Variable Interest Entity [Line Items]      
Equity method investment, ownership percentage 36.40%    
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 sold 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%    
[1] 2014 conformed to 2015 presentation