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Borrowings - Annual Maturities on Borrowings Outstanding (Details)
$ in Millions
Jun. 30, 2025
USD ($)
Debt Instrument [Line Items]  
Other short-term borrowings, 2025 $ 8,472
Total 17,472
Federal Home Loan Bank Advances | Secured Credit Facility  
Debt Instrument [Line Items]  
FHLB borrowings, 2025 $ 9,000