Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 1,940	$ 4,415
Portfolio loans and leases:
Commercial and industrial loans		56,437	51,659
Commercial mortgage loans		10,947	10,316
Commercial construction loans		5,573	5,241
Commercial leases		2,821	3,052
Residential mortgage loans		17,600	16,397
Home equity		4,000	4,084
Indirect secured consumer loans		16,646	16,783
Credit card		1,770	1,766
Other consumer loans		4,205	2,752
Loans and leases		117,900	110,158
Total portfolio loans and leases	[2],[3]	119,999	112,050
Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		1,871	4,394
Commercial
Portfolio loans and leases:
Loans and leases		75,778	70,268
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		68	7
Portfolio loans and leases:
Loans and leases		56,437	51,659
Loans and leases related to SBA Paycheck Protection Program of CARES Act		210	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		2,821	3,052
Consumer
Portfolio loans and leases:
Loans and leases		$ 44,221	$ 41,782

[1] Includes $1,107 and $1,023 of residential mortgage loans held for sale measured at fair value at September 30, 2022 and December 31, 2021, respectively.

[2] Includes $125 and $154 of residential mortgage loans measured at fair value at September 30, 2022 and December 31, 2021, respectively.

[3] Includes $19 and $24 of other short-term investments, $223 and $322 of portfolio loans and leases, $(3) and $(2) of ALLL, $2 and $2 of other assets, $9 and $1 of other liabilities, and $156 and $263 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2022 and December 31, 2021, respectively. For further information, refer to Note 12.