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Investments - Schedule of Fair Values by Classification (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Total interest-bearing securities $ 8,302 $ 11,486
Available-for-sale investments    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 8,302 11,486
Total interest-bearing securities $ 8,302 $ 11,486