Borrowings - Annual Maturities on Borrowings Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Other short-term borrowings, 2024	$ 8,405
2024	30,405
Other short-term borrowings, 2025	0
Total, 2025	2,000
FHLB borrowings, Total	24,000	$ 26,400
Other short-term borrowings, Total	8,405	$ 6,553
Total	32,405
Federal Home Loan Bank Advances \| Secured Credit Facility
Debt Instrument [Line Items]
FHLB borrowings, 2024	22,000
FHLB borrowings, 2025	2,000
FHLB borrowings, Total	$ 24,000

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