Loans and ACL - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Commercial:
Financing Receivable
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ (11)	$ (184)
Commitments to extend, originate, or purchase credit
Financing Receivable
Allowance for Loan and Lease Losses, Period Increase (Decrease)	(6)	(13)
Consumer:
Financing Receivable
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 28	$ (62)