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Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Accounting Policies [Abstract]        
Cash and cash equivalents $ 9,098 $ 8,586    
Restricted cash (included in other current assets) 57 95    
Restricted cash (included in other assets) 197 203    
Total cash, cash equivalents and restricted cash in the statements of cash flows $ 9,352 $ 8,884 $ 7,140 $ 8,525