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Borrowed Funds - Breakdown of Borrowed Funds (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument
Federal Home Loan Bank advances	$ 23,750	$ 20,250
Total wholesale borrowings	25,708	20,250
Junior subordinated debentures	580	579
Subordinated notes	439	438
Total borrowed funds	26,727	21,267
Total wholesale borrowings
Debt Instrument
Total wholesale borrowings	25,708	20,250
FHLB advances
Debt Instrument
Federal Home Loan Bank advances	22,750	19,250
Federal Reserve Bank Advances
Debt Instrument
Fed funds purchased	1,000	1,000
Repurchase agreements
Debt Instrument
Fed funds purchased	1,958	0
Junior Subordinated Debt
Debt Instrument
Junior subordinated debentures	580	579
Subordinated notes
Debt Instrument
Subordinated notes	$ 439	$ 438

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