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Derivatives and Fair Value of Financial Instruments-Derivatives Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Commodities |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Margin account | $ 36 | $ 20
Commodities | Other current assets |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Asset Derivatives | 2 | 4
Derivative assets and liabilities, net basis | 21 | 18
Commodities | Other current liabilities |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Liability Derivatives | 17 | 6
Foreign currencies | Other current assets |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Asset Derivatives | 2 | 3
Foreign currencies | Other current liabilities |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Liability Derivatives | 1 | $ 6
Equity | Short term investments |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Liability Derivatives | $ 2 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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