| Schedule of Securities under repurchase agreement obligations | 
 As of March 31, 2025 and 2024, trading securities included collateralized securities subject to repurchase agreements as described in the following table: 
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March 31, 2025 | 
 
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Interest rates and remaining contractual maturity of the agreements | 
 
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Average interest rate | 
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Up to 30 days | 
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30-90 days | 
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Total | 
 
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| Securities sold under repurchase agreements  | 
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| Non-US sovereign debt | 
15.74  | 
% | 
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$ | 
904,940  | 
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$ | 
2,364  | 
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$ | 
907,304  | 
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| Corporate debt | 
15.95  | 
% | 
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423,572  | 
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87,120  | 
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510,692  | 
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| Corporate equity | 
3.25  | 
% | 
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447  | 
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—  | 
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447  | 
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| Total securities sold under repurchase agreements | 
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$ | 
1,328,959 
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$ | 
89,484 
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$ | 
1,418,443 
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March 31, 2024  | 
 
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Interest rates and remaining contractual maturity of the agreements | 
 
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Average interest rate | 
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Up to 30 days | 
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30-90 days | 
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Total | 
 
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| Securities sold under repurchase agreements  | 
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| Non-US sovereign debt | 
13.78  | 
% | 
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$ | 
1,545,080  | 
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$ | 
259,948  | 
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$ | 
1,805,028  | 
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| Corporate debt | 
13.84  | 
% | 
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923,752  | 
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14,644  | 
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938,396  | 
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| US sovereign debt | 
3.06  | 
% | 
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13,172  | 
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—  | 
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13,172  | 
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| Corporate equity | 
—  | 
% | 
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—  | 
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—  | 
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—  | 
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| Total securities sold under repurchase agreements | 
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$ | 
2,482,004 
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$ | 
274,592 
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$ | 
2,756,596 
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