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Debt Securities (Narrative) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
securities
Dec. 31, 2024
USD ($)
securities
Marketable Securities [Line Items]    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | securities 680 1,210
Total loans pledged to secure borrowings $ 7,300 $ 5,200
Debt Securities    
Marketable Securities [Line Items]    
Interest Receivable $ 43 $ 33