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Derivatives and Fair Value of Financial Instruments-Derivatives Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Commodities |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Margin account | $ 23 | $ 20
Commodities | Other current assets |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Asset Derivatives | 5 | 4
Derivative assets and liabilities, net basis | 17 | 18
Commodities | Other current liabilities |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Liability Derivatives | 11 | 6
Foreign currencies | Other current assets |  |
Fair value of each type of derivative and its location in the Consolidated Balance Sheets |  |
Asset Derivatives |  | 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 | $ 1 |

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