Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 31, 2013 Foreign Currency Contract [Member]	Jun. 30, 2013 Foreign Currency Contract [Member]	Jun. 30, 2013 Biofuels Blending [Member]	Jun. 30, 2012 Biofuels Blending [Member]	Jun. 30, 2013 Biofuels Blending [Member]	Jun. 30, 2012 Biofuels Blending [Member]	Jun. 30, 2013 Fair Value Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Fair Value Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Fair Value Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Cash Flow Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Cash Flow Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Cash Flow Hedging [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Soybean Oil (in thousands of pounds) [Member] lb	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Soybean Oil (in thousands of pounds) [Member] lb	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Soybean Oil (in thousands of pounds) [Member] lb	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Soybean Oil (in thousands of pounds) [Member] lb	Jun. 30, 2013 Economic Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Economic Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Economic Hedging [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Economic Hedging [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Current Year [Member] RINs (in thousands of gallons) [Member] gal	Jun. 30, 2013 Commodity [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Year Two [Member] RINs (in thousands of gallons) [Member] gal	Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Jun. 30, 2013 Commodity [Member] Options Held [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Jun. 30, 2013 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							8,062	10,954	2,892	7,938	5,527	2,411	39,316	28,405,000	5,220,000	58	5,000	0	53,514	49,030,000	27,900,000	0	1,180,000	0	21,678,000	1,215,000	3,510	0	2,585	0	10,750,000	0	99,886	1,700,000	5,620,000	37,527	0	0	99,311	750,000	5,620,000	37,927	0	0	25,000,000	0	26,255	145,000	21,135	0	26,255	145,000	21,135	0	26,321	1,700,000	0	0	25,256	0
Monetary notional amount of derivative liabilities		$ 581
Price Risk Management Activities (Textual)
Foreign currency commitments maturity date	Jul. 31, 2013
Compliance program costs			$ 137	$ 59	$ 267	$ 126