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Borrowed Funds - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument
Interest payable			$ 47	$ 51
FHLB lockout period			12 months
FHLB available capacity			$ 5,400	6,600
FHLB advance, maturity period			5 years
Decrease in total borrowed funds			$ (1,200)
Repayment of FHLB advances upon maturity	$ 1,000	$ 250
Junior subordinated debentures			610	610
Subordinated notes			$ 448	$ 444

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