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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
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.
December 31,
202420232022
(In millions)
Cash and cash equivalents$4,662 $4,848 $4,006 
Restricted cash and cash equivalents79 60 42 
Total cash and cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows
$4,741 $4,908 $4,048 
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.
December 31,
202420232022
(In millions)
Cash and cash equivalents$4,662 $4,848 $4,006 
Restricted cash and cash equivalents79 60 42 
Total cash and cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows
$4,741 $4,908 $4,048