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Financial and Derivative Instruments (Details 1) - Commodity - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Assets at Fair Value | $ 52 | $ 283
Total Liabilities at Fair Value | 21 | 12
Accounts and notes receivable, net |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Assets at Fair Value | 49 | 279
Long-term receivables, net |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Assets at Fair Value | 3 | 4
Accounts payable |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Liabilities at Fair Value | 15 | 12
Deferred credits and other noncurrent obligations |  |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments |  |
Total Liabilities at Fair Value | $ 6 | $ 0

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