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Borrowed Funds (FHLB Borrowings, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Carrying value of debt	$ 58,307	$ 58,601
Parent Company
Debt Instrument [Line Items]
Carrying value of debt	33,727	28,352
Parent Company | Senior debt
Debt Instrument [Line Items]
Carrying value of debt	$ 32,711	27,369
Parent Company | Senior debt | Minimum
Debt Instrument [Line Items]
Interest rate	1.15%
Parent Company | Senior debt | Maximum
Debt Instrument [Line Items]
Interest rate	6.88%
Parent Company | Subordinated debt
Debt Instrument [Line Items]
Interest rate	4.63%
Carrying value of debt	$ 810	777
Parent Company | Junior subordinated debt
Debt Instrument [Line Items]
Interest rate	5.00%
Carrying value of debt	$ 206	206
Subsidiaries
Debt Instrument [Line Items]
Carrying value of debt	24,580	30,249
Subsidiaries | Senior debt
Debt Instrument [Line Items]
Carrying value of debt	$ 5,984	5,128
Subsidiaries | Senior debt | Minimum
Debt Instrument [Line Items]
Interest rate	3.10%
Subsidiaries | Senior debt | Maximum
Debt Instrument [Line Items]
Interest rate	4.86%
Subsidiaries | Subordinated debt
Debt Instrument [Line Items]
Carrying value of debt	$ 2,496	3,121
Subsidiaries | Subordinated debt | Minimum
Debt Instrument [Line Items]
Interest rate	2.70%
Subsidiaries | Subordinated debt | Maximum
Debt Instrument [Line Items]
Interest rate	5.90%
Subsidiaries | FHLB
Debt Instrument [Line Items]
Carrying value of debt	$ 16,100	$ 22,000
Subsidiaries | FHLB | Minimum
Debt Instrument [Line Items]
Interest rate	4.05%
Subsidiaries | FHLB | Maximum
Debt Instrument [Line Items]
Interest rate	4.72%

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Contractual interest rate for funds borrowed, under the debt agreement.

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