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Deposits and Borrowings - Deposits and Short-term Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2025	May 18, 2025	Dec. 31, 2024	Dec. 31, 2023
Deposits:
Non-interest-bearing deposits	$ 27,385		$ 26,122
Interest-bearing deposits	448,386	$ 105,208	336,585
Total deposits	475,771		362,707	$ 348,413
Short-term borrowings:
Total short-term borrowings	1,087		562
Federal funds purchased and securities loaned or sold under agreements to repurchase
Short-term borrowings:
Total short-term borrowings	587		562
Short-term FHLB advances
Short-term borrowings:
Total short-term borrowings	$ 500		$ 0