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Deposits and Borrowings - Deposits and Short-term Borrowings (Details) - USD ($) $ in Millions	Sep. 30, 2025	May 18, 2025	Dec. 31, 2024	Sep. 30, 2024
Deposits:
Non-interest-bearing deposits	$ 27,649		$ 26,122
Interest-bearing deposits	441,136	$ 105,208	336,585
Total deposits	468,785		362,707	$ 353,631
Short-term borrowings:
Total short-term borrowings	616		562
Federal funds purchased and securities loaned or sold under agreements to repurchase
Short-term borrowings:
Total short-term borrowings	$ 616		$ 562