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Related Party Transactions - Transactions with Other Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]          
Revenues from related parties $ 11,578 $ 12,456 $ 33,698 $ 36,854  
Purchases and related costs from related parties 89 103 285 296  
Trade accounts receivable and other receivables, net from related parties 3,623   3,623   $ 3,679
Trade accounts payable to related parties 3,584   3,584   3,647
Affiliated Entity          
Related Party Transaction [Line Items]          
Revenues from related parties 12 $ 12 35 $ 34  
Trade accounts receivable and other receivables, net from related parties 55   55   40
Trade accounts payable to related parties $ 72   $ 72   $ 66