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Concentrations of Credit Risk (Details) - Liabilities - Credit Concentration Risk - USD ($)
$ in Billions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Concentration Risk    
Maximum DB Cayman credit protection $ 11.0 $ 10.0
California    
Concentration Risk    
Concentration risk percentage 17.00% 18.00%
Texas    
Concentration Risk    
Concentration risk percentage 13.00% 13.00%