Loans and Related Allowance for Credit Losses, Loan Purchases, Sales, and Transfers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	$ 128	$ 125	$ 506	$ 309
Sales and net transfers (to)/from LHFS	(1,903)	(1,197)	(3,238)	(2,553)
Total Commercial [Member]
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	127	124	503	306
Sales and net transfers (to)/from LHFS	(785)	(1,186)	(2,097)	(2,318)
Total Consumer [Member]
Loans and Allowance for Credit Losses, Significant Activity [Abstract]
Purchases	1	1	3	3
Sales and net transfers (to)/from LHFS	$ (1,118)	$ (11)	$ (1,141)	$ (235)