Price Risk Management Activities (Details) lb in Thousands, bu in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) lb MBbls bu	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Price Risk Management Activities (Textual)
Compliance program costs | $	$ 942	$ 749	$ 440
Foreign Currency Contracts [Member]
Price Risk Management Activities (Textual)
Monetary notional amount of derivative liabilities | $	$ 507
Foreign currency commitments maturity date	Jan. 31, 2018
Not Designated as Hedging Instrument, Economic Hedge [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	2,655
Not Designated as Hedging Instrument, Economic Hedge [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	2,590
Not Designated as Hedging Instrument, Economic Hedge [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
Not Designated as Hedging Instrument, Economic Hedge [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
Not Designated as Hedging Instrument, Economic Hedge [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	83,296
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	21,315
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, mass | lb	76,079
Not Designated as Hedging Instrument, Economic Hedge [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	87,542
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2018 Maturity [Member] | Short (Sales) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	50,695
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2018 Maturity [Member] | Short (Sales) [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, mass | lb	154,378
Not Designated as Hedging Instrument, Economic Hedge [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
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	35
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, mass | lb	0
Not Designated as Hedging Instrument, Economic Hedge [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
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2019 Maturity [Member] | Short (Sales) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	665
Not Designated as Hedging Instrument, Economic Hedge [Member] | Future, 2019 Maturity [Member] | Short (Sales) [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, mass | lb	0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward Contracts, 2018 Maturity [Member] | Long (Purchases) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	25,103
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward Contracts, 2019 Maturity [Member] | Long (Purchases) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	630
Not Designated as Hedging Instrument, Trading [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	659
Not Designated as Hedging Instrument, Trading [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	659
Not Designated as Hedging Instrument, Trading [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
Not Designated as Hedging Instrument, Trading [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
Not Designated as Hedging Instrument, Trading [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	37,532
Not Designated as Hedging Instrument, Trading [Member] | Future, 2018 Maturity [Member] | Long (Purchases) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	300
Not Designated as Hedging Instrument, Trading [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	36,919
Not Designated as Hedging Instrument, Trading [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
Not Designated as Hedging Instrument, Trading [Member] | Future, 2019 Maturity [Member] | Long (Purchases) [Member] | Grain (in bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives, volume | bu	0
Not Designated as Hedging Instrument, Trading [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	150
Not Designated as Hedging Instrument, Trading [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	153,050
Not Designated as Hedging Instrument, Trading [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	153,050
Not Designated as Hedging Instrument, Trading [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
Not Designated as Hedging Instrument, Trading [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