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Borrowings - Annual Maturities on Borrowings Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
FHLB borrowings
FHLB borrowings, Total	$ 850	$ 16,700
Other short-term borrowings
Other short-term borrowings, 2025	5,541
Other short-term borrowings, 2026	1,000
Net Amounts Presented in the Condensed Consolidated Balance Sheets	6,541	$ 5,999
Advance From Federal Home Loan Bank And Other Short-Term Borrowings, Maturity [Abstract]
Total, 2025	5,541
Total, 2026	1,850
Total	7,391
Federal Home Loan Bank Advances | Secured Credit Facility
FHLB borrowings
FHLB borrowings, 2025	0
FHLB borrowings, 2026	850
FHLB borrowings, Total	$ 850

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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-Topic 942
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Amount of advance from Federal Home Loan Bank (FHLBank) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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