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Borrowings - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Short-term Debt [Line Items]    
Short-term borrowings $ 26,885 $ 27,839
FHLB Advances    
Short-term Debt [Line Items]    
Short-term borrowings $ 17,600 $ 22,100