Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			1 Months Ended
	Mar. 31, 2014 Biofuels Blending [Member]	Mar. 31, 2013 Biofuels Blending [Member]	Mar. 31, 2014 Foreign Currency Contract [Member]	Apr. 30, 2014 Foreign Currency Contract [Member] Subsequent Event [Member]	Mar. 31, 2014 Fair Value Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Fair Value Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Fair Value Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Cash Flow Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Cash Flow Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Cash Flow Hedging [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Soybean Oil (in thousands of pounds) [Member] lb	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Soybean Oil (in thousands of pounds) [Member] lb	Mar. 31, 2014 Economic Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Economic Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Economic Hedging [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Economic Hedging [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in billions of BTUs) [Member] MMBTU	Mar. 31, 2014 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in billions of BTUs) [Member] MMBTU	Mar. 31, 2014 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Natural Gas (in billions of BTUs) [Member] MMBTU	Mar. 31, 2014 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in thousands of bushels) [Member] bu	Mar. 31, 2014 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Natural Gas (in billions of BTUs) [Member] MMBTU	Mar. 31, 2014 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in billions of BTUs) [Member] MMBTU	Mar. 31, 2014 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in billions of BTUs) [Member] MMBTU	Mar. 31, 2014 Commodity [Member] Options Held [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2014 Commodity [Member] Options Held [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives					2,229	2,905	676	13,578	10,312	3,266	68,833	12,085,000	14	0	95,621	32,130,000	99,540,000	0	2,075,000	0	16,957,000	2,157,000	10,260	0	10,551	0	97,715	145,000	1,000,000	8,940	0	1,500,000	97,631	145,000	750,000	8,940	0	0	17,760	0	17,760	0	12,700	500,000	0	0	13,150	0
Price Risk Management Activities (Textual)
Monetary notional amount of derivative liabilities			$ 999
Foreign currency commitments maturity date				Apr. 30, 2014
Compliance program costs	$ 92	$ 130