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Financial and Derivative Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Consolidated Balance Sheet: Fair Value of Derivatives Not Designated as Hedging Instruments | Derivative instruments measured at fair value at March 31, 2018, and December 31, 2017, and their classification on the Consolidated Balance Sheet and Consolidated Statement of Income are as follows: Consolidated Balance Sheet: Fair Value of Derivatives Not Designated as Hedging Instruments (Millions of dollars)
Type of Contract |  | Balance Sheet Classification |  | At March 31 2018 |  | At December 31 2017
Commodity |  | Accounts and notes receivable, net |  | $ | 7 |  |  | $ | 22 |
Commodity |  | Long-term receivables, net |  | — |  |  | — |
Total Assets at Fair Value |  | $ | 7 |  |  | $ | 22 |
Commodity |  | Accounts payable |  | $ | 90 |  |  | $ | 122 |
Commodity |  | Deferred credits and other noncurrent obligations |  | 5 |  |  | 2 |
Total Liabilities at Fair Value |  | $ | 95 |  |  | $ | 124 |
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 (Millions of dollars)
|  |  |  | (Loss) / Gain Three Months Ended March 31
Type of Contract |  | Statement of Income Classification |  | 2018 |  | 2017
Commodity |  | Sales and other operating revenues |  | $ | (12 | ) |  | $ | 162 |
Commodity |  | Purchased crude oil and products |  | (9 | ) |  | 4 |
Commodity |  | Other income |  | — |  |  | (2 | )
|  |  |  | $ | (21 | ) |  | $ | 164 |
Schedule of Offsetting Assets | The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at March 31, 2018, and December 31, 2017. Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities (Millions of dollars)
|  | Gross Amount Recognized |  | Gross Amounts Offset |  | Net Amounts Presented |  | Gross Amounts Not Offset |  | Net Amount
At March 31, 2018 |  |  |  |  |
Derivative Assets |  | $ | 1,180 |  |  | $ | 1,173 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Derivative Liabilities |  | $ | 1,268 |  |  | $ | 1,173 |  |  | $ | 95 |  |  | $ | — |  |  | $ | 95 |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |
Derivative Assets |  | $ | 1,169 |  |  | $ | 1,147 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 22 |
Derivative Liabilities |  | $ | 1,271 |  |  | $ | 1,147 |  |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |
Schedule of Offsetting Liabilities | The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at March 31, 2018, and December 31, 2017. Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities (Millions of dollars)
|  | Gross Amount Recognized |  | Gross Amounts Offset |  | Net Amounts Presented |  | Gross Amounts Not Offset |  | Net Amount
At March 31, 2018 |  |  |  |  |
Derivative Assets |  | $ | 1,180 |  |  | $ | 1,173 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 7 |
Derivative Liabilities |  | $ | 1,268 |  |  | $ | 1,173 |  |  | $ | 95 |  |  | $ | — |  |  | $ | 95 |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |
Derivative Assets |  | $ | 1,169 |  |  | $ | 1,147 |  |  | $ | 22 |  |  | $ | — |  |  | $ | 22 |
Derivative Liabilities |  | $ | 1,271 |  |  | $ | 1,147 |  |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |

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