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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Schedule of Equity Method Investments [Line Items]        
Revenue $ 9,754 $ 8,391 $ 18,663 $ 16,326
Net income (loss) 239 142 431 290
Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Schedule of Equity Method Investments [Line Items]        
Revenue 722 950 1,483 1,963
Operating income 293 340 536 655
Net income (loss) $ 117 $ (198) $ 308 $ (1,235)