Loans and Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022		Mar. 31, 2021	Dec. 31, 2021		Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable
Unearned income	$ 235			$ 244
Net premium	537			498
Accrued interest receivable	328			332
Loans pledged at the FHLB	15,400			15,300
Loans pledged at the FRB	53,500			50,900
Direct financing lease - interest income	8		$ 12
Sales type lease - interest income	11		10
Allowance for loan and lease losses	1,908	[1]	$ 2,208	1,892	[1]	$ 2,453
Commercial Leases
Accounts, Notes, Loans and Financing Receivable
Allowance for loan and lease losses	$ 17			$ 15

[1] Includes $24 and $24 of other short-term investments, $266 and $322 of portfolio loans and leases, $(2) and $(2) of ALLL, $2 and $2 of other assets, an immaterial amount and $1 of other liabilities, and $209 and $263 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2022 and December 31, 2021, respectively. For further information, refer to Note 11.