Loans and Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable
Unearned income	$ 244		$ 280
Net premium	498		251
Accrued interest receivable	332		350
Loans pledged at the FHLB	15,300		15,500
Loans pledged at the FRB	50,900		37,800
Direct financing lease - interest income	42		64		$ 88
Sales type lease - interest income	42		28		13
Allowance for loan and lease losses	1,892	[1]	2,453	[1]	$ 1,202	$ 1,103
Commercial Leases
Accounts, Notes, Loans and Financing Receivable
Allowance for loan and lease losses	$ 15		$ 29

[1] Includes $24 and $55 of other short-term investments, $322 and $756 of portfolio loans and leases, $(2) and $(7) of ALLL, $2 and $5 of other assets, $1 and $2 of other liabilities and $263 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2021 and 2020, respectively. For further information, refer to Note 12.