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Financial and Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Assets at Fair Value $ 107us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue $ 413us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Total Liabilities at Fair Value 104us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue 84us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
Commodity [Member] | Accounts and notes receivable, net [Member]    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Assets at Fair Value 106us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= cvx_AccountsAndNotesReceivableNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 401us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= cvx_AccountsAndNotesReceivableNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodity [Member] | Long term receivables, net [Member]    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Assets at Fair Value 1us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= cvx_LongTermReceivablesNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 12us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
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= cvx_LongTermReceivablesNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodity [Member] | Accounts payable [Member]    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Liabilities at Fair Value 89us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 57us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodity [Member] | Deferred credits and other noncurrent obligations [Member]    
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments    
Total Liabilities at Fair Value $ 15us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= cvx_DeferredCreditsAndOtherNoncurrentObligationsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 $ 27us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= cvx_DeferredCreditsAndOtherNoncurrentObligationsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember