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Loans and ACL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Loans and ACL - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount		$ 42	$ 48
Unfunded lending commitments related to the modified obligations	$ 430	430		$ 336
Commercial:
Financing Receivable
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(60)	(53)
Consumer:
Financing Receivable
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 89	$ 95