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Financial Assets And Financial Liabilities (Narrative) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers in and/or out of Level 3 $ 0  
Securities Purchased Under Agreement To Resell [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities purchased under agreemet to resell [1] 30,058,000,000 $ 21,353,000,000
Securities Borrowed [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities purchased under agreemet to resell $ 2,451,000,000 [1] $ 0
[1] As of September 30, 2025 and December 31, 2024, the Company had $30.1 billion and $21.4 billion, respectively, of securities purchased under agreements to resell, and $2.5 billion and $0, respectively, of securities borrowed that were segregated to satisfy regulatory requirements. These securities are included in “Securities - segregated for regulatory purposes” in the condensed consolidated statements of financial condition.