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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of Cash and Cash Equivalents The following table reconciles cash, cash equivalents and restricted cash reported in our consolidated balance sheets to the total amount presented in our consolidated statements of cash flows:
September 30,
2020		December 31,
2019
(in millions)
Cash and cash equivalents$4,353 $3,315 
Restricted cash and cash equivalents725 779 
Restricted cash included within long-term investments and other assets3 3 
Total cash, cash equivalents and restricted cash and cash equivalents in the consolidated statement of cash flow$5,081 $4,097 
Schedule of Restrictions on Cash and Cash Equivalents The following table reconciles cash, cash equivalents and restricted cash reported in our consolidated balance sheets to the total amount presented in our consolidated statements of cash flows:
September 30,
2020		December 31,
2019
(in millions)
Cash and cash equivalents$4,353 $3,315 
Restricted cash and cash equivalents725 779 
Restricted cash included within long-term investments and other assets3 3 
Total cash, cash equivalents and restricted cash and cash equivalents in the consolidated statement of cash flow$5,081 $4,097