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Financial and Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total assets at fair value | $ 22 | $ 32
Total liabilities at fair value | 124 | 109
Commodity | Accounts and notes receivable, net |  |
Derivatives, Fair Value [Line Items] |  |
Total assets at fair value | 22 | 30
Commodity | Long-term receivables, net |  |
Derivatives, Fair Value [Line Items] |  |
Total assets at fair value | 0 | 2
Commodity | Accounts payable |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities at fair value | 122 | 99
Commodity | Deferred credits and other noncurrent obligations |  |
Derivatives, Fair Value [Line Items] |  |
Total liabilities at fair value | $ 2 | $ 10

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