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Borrowed Funds (Narrative) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Parent Company | Senior debt  
Debt Instrument [Line Items]  
Basis adjustments - Fair value accounting hedges $ 100
Parent Company | Subordinated debt  
Debt Instrument [Line Items]  
Basis adjustments - Fair value accounting hedges (38)
Subsidiaries | Senior debt  
Debt Instrument [Line Items]  
Basis adjustments - Fair value accounting hedges (33)
Subsidiaries | Subordinated debt  
Debt Instrument [Line Items]  
Basis adjustments - Fair value accounting hedges $ (71)