Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 4,415	$ 4,741
Portfolio loans and leases:
Commercial and industrial loans		51,659	49,665
Commercial mortgage loans		10,316	10,602
Commercial construction loans		5,241	5,815
Commercial leases		3,052	2,915
Residential mortgage loans		16,397	15,928
Home equity		4,084	5,183
Indirect secured consumer loans		16,783	13,653
Credit card		1,766	2,007
Other consumer loans		2,752	3,014
Total portfolio loans and leases	[2],[3]	112,050	108,782
Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		4,394	4,465
Residential mortgage loans | GNMA loans
Portfolio loans and leases:
Total portfolio loans and leases			39
Commercial
Portfolio loans and leases:
Total portfolio loans and leases		70,268	68,997
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		7	230
Portfolio loans and leases:
Total portfolio loans and leases		51,659	49,665
Loans and leases related to SBA Paycheck Protection Program of CARES Act		1,300	4,800
Commercial | Commercial mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		13	7
Commercial | Commercial leases
Loans and leases held for sale:
Loans and leases held for sale		1	39
Portfolio loans and leases:
Total portfolio loans and leases		3,052	2,915
Consumer
Portfolio loans and leases:
Total portfolio loans and leases		$ 41,782	39,785
Consumer | Residential mortgage loans | GNMA loans
Portfolio loans and leases:
Total portfolio loans and leases			$ 39

[1] Includes $1,023 and $1,481 of residential mortgage loans held for sale measured at fair value at December 31, 2021 and 2020, respectively.

[2] Includes $154 and $161 of residential mortgage loans measured at fair value at December 31, 2021 and 2020, respectively.

[3] 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.