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Cash, Cash Equivalents and Restricted Cash (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash and Cash Equivalents [Abstract] |
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 | 2020 |  | 2019 |  | 2018
Cash and cash equivalents as presented in our Consolidated Balance Sheets | $ | 2,924 |  |  | $ | 1,952 |  |  | $ | 1,498 |
Restricted cash included in prepaid and other current assets | 10 |  |  | — |  |  | 40 |
Restricted cash included in other noncurrent assets | — |  |  | — |  |  | — |
Cash, cash equivalents and restricted cash as presented in our Consolidated Statements of Cash Flows | $ | 2,934 |  |  | $ | 1,952 |  |  | $ | 1,538 |
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 | 2020 |  | 2019 |  | 2018
Cash and cash equivalents as presented in our Consolidated Balance Sheets | $ | 2,924 |  |  | $ | 1,952 |  |  | $ | 1,498 |
Restricted cash included in prepaid and other current assets | 10 |  |  | — |  |  | 40 |
Restricted cash included in other noncurrent assets | — |  |  | — |  |  | — |
Cash, cash equivalents and restricted cash as presented in our Consolidated Statements of Cash Flows | $ | 2,934 |  |  | $ | 1,952 |  |  | $ | 1,538 |

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