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Loans and ACL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Loans and ACL - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount	$ 55	$ 40
Unfunded lending commitments related to the modified obligations	330		$ 336
Commercial:
Financing Receivable
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	7
Consumer:
Financing Receivable
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 6