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Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Accounting Policies [Abstract]        
Cash and cash equivalents $ 4,856 $ 4,662 $ 4,513  
Restricted cash and cash equivalents 99   59  
Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows $ 4,955 $ 4,741 $ 4,572 $ 4,908