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Borrowed Funds - Narrative (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument
Interest payable	$ 109,000,000	$ 50,000,000
FHLB lockout period	5 years
Long-term debt	$ 20,333,000,000	21,267,000,000
Junior subordinated debentures	609,000,000	609,000,000
Subordinated notes	442,000,000	438,000,000
Federal Reserve Bank term funding
Debt Instrument
Long-term debt	0
Fed funds purchased	$ 1,000,000,000.0	$ 1,000,000,000

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