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Variable Interest Entities and Equity Method Investments - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]          
Total investment $ 4,300   $ 4,300   $ 4,400
Total assets 118,618   118,618   35,885
Net income 247 $ 98 361 $ 111  
Aggregated total          
Schedule of Equity Method Investments [Line Items]          
Total assets 37,800   37,800   $ 4,400
Net income $ 65 $ 30 $ 103 $ 66