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Cash, Cash Equivalents and Restricted Cash (Tables)
 6 Months Ended
Jun. 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:
June 30,
Millions of dollars20212020
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets$2,968 $2,546 
Restricted cash included in prepaid and other current assets — — 
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows$2,968 $2,546 
December 31,
Millions of dollars20202019
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 contributions held as part of the Company's Charitable Foundation as of December 31, 2020.
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:
June 30,
Millions of dollars20212020
Cash and cash equivalents as presented in our Consolidated Condensed Balance Sheets$2,968 $2,546 
Restricted cash included in prepaid and other current assets — — 
Cash, cash equivalents and restricted cash as presented in our Consolidated Condensed Statements of Cash Flows$2,968 $2,546 
December 31,
Millions of dollars20202019
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 contributions held as part of the Company's Charitable Foundation as of December 31, 2020.