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Financial and Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments | Consolidated Balance Sheet: Fair Value of Derivatives Not Designated as Hedging Instruments
|  |  |  |  | At December 31 |
Type of Contract | Balance Sheet Classification | 2017 |  |  |  | 2016 |
Commodity | Accounts and notes receivable, net | $ | 22 |  |  |  | $ | 30 |
Commodity | Long-term receivables, net | — |  |  |  | 2 |
Total assets at fair value | $ | 22 |  |  |  | $ | 32 |
Commodity | Accounts payable | $ | 122 |  |  |  | $ | 99 |
Commodity | Deferred credits and other noncurrent obligations | 2 |  |  |  | 10 |
Total liabilities at fair value | $ | 124 |  |  |  | $ | 109 |
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments | Consolidated Statement of Income: The Effect of Derivatives Not Designated as Hedging Instruments
|  | Gain/(Loss) |
Type of Derivative | Statement of | Year ended December 31 |
Contract | Income Classification | 2017 |  |  |  | 2016 |  |  | 2015 |
Commodity | Sales and other operating revenues | $ | (105 | ) |  |  | $ | (269 | ) |  | $ | 277 |
Commodity | Purchased crude oil and products | (9 | ) |  |  | (31 | ) |  | 30 |
Commodity | Other income | (2 | ) |  |  | — |  |  | (3 | )
|  | $ | (116 | ) |  |  | $ | (300 | ) |  | $ | 304 |
Consolidated Balance Sheet: The Effect of Netting Derivative Assets | The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at December 31, 2017 and December 31, 2016. Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities
|  | Gross Amounts Recognized |  |  | Gross Amounts Offset |  |  | Net Amounts Presented |  |  | Gross Amounts Not Offset |  |  | Net Amounts |
At December 31, 2017 |  |  |  |  |
Derivative Assets |  | $ | 1,169 |  |  | $ | 1,147 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 22 |
Derivative Liabilities |  | $ | 1,271 |  |  | $ | 1,147 |  |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |
At December 31, 2016 |  |  |  |  |  |  |  |  |  |
Derivative Assets |  | $ | 1,052 |  |  | $ | 1,020 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 32 |
Derivative Liabilities |  | $ | 1,129 |  |  | $ | 1,020 |  |  | $ | 109 |  |  | $ | — |  |  | $ | 109 |
Consolidated Balance Sheet: The Effect of Netting Derivative Liabilities | The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at December 31, 2017 and December 31, 2016. Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities
|  | Gross Amounts Recognized |  |  | Gross Amounts Offset |  |  | Net Amounts Presented |  |  | Gross Amounts Not Offset |  |  | Net Amounts |
At December 31, 2017 |  |  |  |  |
Derivative Assets |  | $ | 1,169 |  |  | $ | 1,147 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 22 |
Derivative Liabilities |  | $ | 1,271 |  |  | $ | 1,147 |  |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |
At December 31, 2016 |  |  |  |  |  |  |  |  |  |
Derivative Assets |  | $ | 1,052 |  |  | $ | 1,020 |  |  | $ | 32 |  |  | $ | — |  |  | $ | 32 |
Derivative Liabilities |  | $ | 1,129 |  |  | $ | 1,020 |  |  | $ | 109 |  |  | $ | — |  |  | $ | 109 |

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