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Price Risk Management Activities (Details)
lb in Thousands, bu in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
lb
MBbls
bu
Mar. 31, 2017
USD ($)
Price Risk Management Activities (Textual)    
Compliance program costs | $ $ 206 $ 146
Foreign Currency Contracts [Member]    
Price Risk Management Activities (Textual)    
Monetary notional amount of derivative liabilities | $ $ 479  
Foreign currency commitments maturity date Apr. 30, 2018  
Economic Hedges [Member] | Swap, 2018 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 9,099  
Economic Hedges [Member] | Swap, 2018 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 8,636  
Economic Hedges [Member] | Swap, 2019 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Economic Hedges [Member] | Swap, 2019 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Economic Hedges [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 99,455  
Economic Hedges [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 23,800  
Economic Hedges [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Soybean Oil (in pounds) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, pounds | lb 28,320  
Economic Hedges [Member] | Future, 2018 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 101,298  
Economic Hedges [Member] | Future, 2018 Maturity [Member] | Short (Sales) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 63,330  
Economic Hedges [Member] | Future, 2018 Maturity [Member] | Short (Sales) [Member] | Soybean Oil (in pounds) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, pounds | lb 89,819  
Economic Hedges [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Economic Hedges [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 125  
Economic Hedges [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Soybean Oil (in pounds) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, pounds | lb 0  
Economic Hedges [Member] | Future, 2019 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Economic Hedges [Member] | Future, 2019 Maturity [Member] | Short (Sales) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 4,685  
Economic Hedges [Member] | Future, 2019 Maturity [Member] | Short (Sales) [Member] | Soybean Oil (in pounds) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, pounds | lb 0  
Economic Hedges [Member] | Forward Contracts, 2018 Maturity [Member] | Long (Purchases) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 35,069  
Economic Hedges [Member] | Forward Contracts, 2019 Maturity [Member] | Long (Purchases) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 4,759  
Trading Derivatives [Member] | Swap, 2018 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 300  
Trading Derivatives [Member] | Swap, 2018 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 300  
Trading Derivatives [Member] | Swap, 2019 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Trading Derivatives [Member] | Swap, 2019 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Trading Derivatives [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 35,329  
Trading Derivatives [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 250  
Trading Derivatives [Member] | Future, 2018 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 35,247  
Trading Derivatives [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 2,675  
Trading Derivatives [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Corn (in bushels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume | bu 0  
Trading Derivatives [Member] | Future, 2019 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 2,675  
Trading Derivatives [Member] | Options Held, 2018 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 112,500  
Trading Derivatives [Member] | Options Held, 2018 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 112,800  
Trading Derivatives [Member] | Options Held, 2019 Maturity [Member] | Long (Purchases) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0  
Trading Derivatives [Member] | Options Held, 2019 Maturity [Member] | Short (Sales) [Member] | Crude Oil (in thousands of barrels) [Member]    
Volume of Outstanding Contracts    
Nonmonetary notional amount of price risk derivatives, volume 0