v3.26.1
Bank Deposits (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Bank Deposits [Line Items]    
Time deposits $ 0 $ 0
Brokerage Customers Deposits [Member]    
Bank Deposits [Line Items]    
Deposits of related parties $ 24,300 $ 25,600