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Cash, Cash Equivalents and Restricted Cash (Tables) | 9 Months Ended
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Sep. 30, 2021
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 Condensed Statements of Cash Flows:
| September 30,
Millions of dollars | 2021 |  | 2020
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets | $ | 2,875 |  |  | $ | 3,528 |
Restricted cash included in prepaid and other current assets(1) | — |  |  | 13 |
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows | $ | 2,875 |  |  | $ | 3,541 |
| December 31,
Millions of dollars | 2020 |  | 2019
Cash and cash equivalents as presented in our Consolidated Balance Sheets | $ | 2,924 |  |  | $ | 1,952 |
Restricted cash included in prepaid and other current assets (1) | 10 |  |  | — |
Cash, cash equivalents and restricted cash as presented in our Consolidated Statements of Cash Flows | $ | 2,934 |  |  | $ | 1,952 |
(1)Restricted cash represents consolidated contributions held as part of the Company's Charitable Foundation
Schedule of Cash and Cash Equivalents | The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported within our Consolidated Condensed Statements of Cash Flows:
| September 30,
Millions of dollars | 2021 |  | 2020
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets | $ | 2,875 |  |  | $ | 3,528 |
Restricted cash included in prepaid and other current assets(1) | — |  |  | 13 |
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows | $ | 2,875 |  |  | $ | 3,541 |
| December 31,
Millions of dollars | 2020 |  | 2019
Cash and cash equivalents as presented in our Consolidated Balance Sheets | $ | 2,924 |  |  | $ | 1,952 |
Restricted cash included in prepaid and other current assets (1) | 10 |  |  | — |
Cash, cash equivalents and restricted cash as presented in our Consolidated Statements of Cash Flows | $ | 2,934 |  |  | $ | 1,952 |
(1)Restricted cash represents consolidated contributions held as part of the Company's Charitable Foundation

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