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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]        
Revenue $ 10,258 $ 9,036 $ 28,921 $ 25,363
Net income (loss) 396 245 827 535
Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Equity Method Investments [Line Items]        
Revenue 876 797 2,360 2,760
Operating income 366 243 902 898
Net income (loss) $ 184 $ 1 $ 492 $ (1,235)