Borrowings - Annual Maturities on Borrowings Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Other short-term borrowings, 2024	$ 5,094
2024	13,994
Other short-term borrowings, 2025	5,499
Total, 2025	19,199
FHLB borrowings, Total	22,600	$ 26,400
Other short-term borrowings, Total	10,593	$ 6,553
Total	33,193
Federal Home Loan Bank Advances \| Secured Credit Facility
Debt Instrument [Line Items]
FHLB borrowings, 2024	8,900
FHLB borrowings, 2025	13,700
FHLB borrowings, Total	$ 22,600

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