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Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounting Policies [Abstract]        
Cash and cash equivalents $ 4,499 $ 4,662 $ 4,354  
Restricted cash and cash equivalents 93   64  
Total cash, cash equivalents, and restricted cash and cash equivalents presented in the consolidated statements of cash flows $ 4,592 $ 4,741 $ 4,418 $ 4,908