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Financial and Derivative Instruments (Details) - Commodity - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Assets at Fair Value | $ 7 | $ 22
Total Liabilities at Fair Value | 184 | 124
Accounts and notes receivable, net |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Assets at Fair Value | 7 | 22
Long-term receivables, net |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Assets at Fair Value | 0 | 0
Accounts payable |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Liabilities at Fair Value | 171 | 122
Deferred credits and other noncurrent obligations |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Liabilities at Fair Value | $ 13 | $ 2

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