Short-Term Borrowings - Components of Other Short-Term Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Short-Term Debt [Abstract]
FHLB advances	$ 4,100	$ 2,500
Securities sold under repurchase agreements	273	330
Derivative collateral	19	3
Other borrowed money	58	28
Other short-term borrowings	$ 4,450	$ 2,861