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Significant Accounting Policies - Receivables and Contract Balances (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Accounting Policies [Abstract]    
Trade receivables (included in accounts receivable, net) $ 11,221 $ 9,881
Contract liabilities (included in accrued expenses and other current liabilities) $ 58 $ 144