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%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details