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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

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