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Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]  
Schedule of Cash and Cash Equivalents The restricted cash and cash equivalents presented below are included in “Restricted investments” in the accompanying consolidated balance sheets.
March 31,
 20252024
(In millions)
Cash and cash equivalents$4,856 $4,513 
Restricted cash and cash equivalents99 59 
Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows
$4,955 $4,572 
Schedule of Restricted Cash and Cash Equivalents The restricted cash and cash equivalents presented below are included in “Restricted investments” in the accompanying consolidated balance sheets.
March 31,
 20252024
(In millions)
Cash and cash equivalents$4,856 $4,513 
Restricted cash and cash equivalents99 59 
Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows
$4,955 $4,572