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Concentrations of Credit Risk (Details) - Liabilities - Credit Concentration Risk - USD ($) $ in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Concentration Risk |  |
Maximum DB Cayman credit protection | $ 11.5 | $ 11.4
California |  |
Concentration Risk |  |
Concentration risk percentage | 16.00% | 16.00%
Texas |  |
Concentration Risk |  |
Concentration risk percentage | 12.00% | 12.00%

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