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Price Risk Management Activities (Details) lb in Thousands, bu in Thousands, $ in Millions | 12 Months Ended
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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 |  |

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