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Commitments, Contingencies, Guarantees and Others - Other Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 8 Months Ended
Mar. 31, 2024
Jun. 30, 2024
Loss Contingencies [Line Items]    
Loss contingency, estimate of possible loss   $ 200
FDIC Special Assessment    
Loss Contingencies [Line Items]    
Operating expenses $ 339 289
Loss contingency, estimate of possible loss   $ 200