Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 2,616	$ 4,415
Portfolio loans and leases:
Commercial and industrial loans		53,909	51,659
Commercial mortgage loans		10,694	10,316
Commercial construction loans		5,420	5,241
Commercial leases		2,915	3,052
Residential mortgage loans		17,144	16,397
Home equity		3,916	4,084
Indirect secured consumer loans		17,424	16,783
Credit card		1,690	1,766
Other consumer loans		2,753	2,752
Loans and Leases		113,957	110,158
Total portfolio loans and leases	[2],[3]	115,865	112,050
Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		2,593	4,394
Commercial
Portfolio loans and leases:
Loans and Leases		72,938	70,268
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		22	7
Portfolio loans and leases:
Loans and Leases		53,909	51,659
Loans and leases related to SBA Paycheck Protection Program of CARES Act		737	1,300
Commercial | Commercial mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		0	13
Commercial | Commercial leases
Loans and leases held for sale:
Loans and leases held for sale		1	1
Portfolio loans and leases:
Loans and Leases		2,915	3,052
Consumer
Portfolio loans and leases:
Loans and Leases		$ 42,927	$ 41,782

[1] Includes $858 and $1,023 of residential mortgage loans held for sale measured at fair value at March 31, 2022 and December 31, 2021, respectively.

[2] Includes $145 and $154 of residential mortgage loans measured at fair value at March 31, 2022 and December 31, 2021, respectively.

[3] 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.