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Concentrations of Credit Risk (Details) - Liabilities - Credit Concentration Risk - USD ($) $ in Billions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Concentration Risk |  |
Maximum DB Cayman credit protection | $ 11.4 | $ 10.0
California |  |
Concentration Risk |  |
Concentration risk percentage | 16.00% | 18.00%
Texas |  |
Concentration Risk |  |
Concentration risk percentage | 12.00% | 13.00%

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