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Cash, Cash Equivalents and Restricted Cash (Tables) | 12 Months Ended
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Dec. 31, 2018
Cash and Cash Equivalents [Abstract] |
Restrictions on Cash and Cash Equivalents | The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported within our Consolidated Statements of Cash Flows:
| December 31
Millions of dollars | 2018 |  | 2017 |  | 2016
Cash and cash equivalents as presented in our Consolidated Balance Sheets | $ | 1,498 |  |  | $ | 1,196 |  |  | $ | 1,085 |
Restricted cash included in prepaid and other current assets (1) | 40 |  |  | 48 |  |  | 45 |
Restricted cash included in other noncurrent assets (1) | — |  |  | 49 |  |  | 110 |
Cash, cash equivalents and restricted cash as presented in our Consolidated Statements of Cash Flows | $ | 1,538 |  |  | $ | 1,293 |  |  | $ | 1,240 |
(1)Change in restricted cash resulted in realization of foreign currency translation adjustments of $3 million and ($8 million), respectively, for the twelve months ended December 31, 2018 and 2017 compared to the prior year.
Schedule of Cash and Cash Equivalents | The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported within our Consolidated Statements of Cash Flows:
| December 31
Millions of dollars | 2018 |  | 2017 |  | 2016
Cash and cash equivalents as presented in our Consolidated Balance Sheets | $ | 1,498 |  |  | $ | 1,196 |  |  | $ | 1,085 |
Restricted cash included in prepaid and other current assets (1) | 40 |  |  | 48 |  |  | 45 |
Restricted cash included in other noncurrent assets (1) | — |  |  | 49 |  |  | 110 |
Cash, cash equivalents and restricted cash as presented in our Consolidated Statements of Cash Flows | $ | 1,538 |  |  | $ | 1,293 |  |  | $ | 1,240 |
(1)Change in restricted cash resulted in realization of foreign currency translation adjustments of $3 million and ($8 million), respectively, for the twelve months ended December 31, 2018 and 2017 compared to the prior year.

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