v3.26.1
Equity Method Investment - Schedule of Equity Method Investment Financial Position and Results of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]        
Assets $ 122,766   $ 57,706  
Liabilities 108,172   50,662  
Equity interests 14,594 $ 6,543 7,044 $ 6,432
Total liabilities and equity 122,766   57,706  
Net income (loss) 150 140    
Bankers Healthcare Group, LLC        
Schedule of Equity Method Investments [Line Items]        
Assets 4,443   4,264  
Liabilities 3,951   3,824  
Equity interests 492   440  
Total liabilities and equity 4,443   $ 4,264  
Revenues 302 241    
Net income (loss) $ 69 $ 44