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Borrowed Funds (Narrative) (Details) $ in Millions	Sep. 30, 2024 USD ($)
Parent Company | Senior debt
Debt Instrument [Line Items]
Basis adjustments - Fair value accounting hedges	$ 124
Parent Company | Subordinated debt
Debt Instrument [Line Items]
Basis adjustments - Fair value accounting hedges	(32)
Subsidiaries | Senior debt
Debt Instrument [Line Items]
Basis adjustments - Fair value accounting hedges	(74)
Subsidiaries | Subordinated debt
Debt Instrument [Line Items]
Basis adjustments - Fair value accounting hedges	$ (101)

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