Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 749	$ 1,007
Portfolio loans and leases:
Commercial and industrial loans		57,720	57,232
Commercial mortgage loans		11,228	11,020
Commercial construction loans		5,548	5,433
Commercial leases		2,743	2,704
Residential mortgage loans		17,608	17,628
Home equity		3,958	4,039
Indirect secured consumer loans		16,484	16,552
Credit card		1,761	1,874
Other consumer loans		5,807	4,998
Loans and leases		120,642	119,286
Total portfolio loans and leases		122,857	121,480
Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		725	934
Commercial
Portfolio loans and leases:
Loans and leases		77,239	76,389
Total portfolio loans and leases		77,239	76,389
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		21	73
Portfolio loans and leases:
Loans and leases		57,720	57,232
Total portfolio loans and leases		57,720	57,232
Commercial | Commercial leases
Loans and leases held for sale:
Loans and leases held for sale		3	0
Portfolio loans and leases:
Loans and leases		2,743	2,704
Total portfolio loans and leases		2,743	2,704
Consumer
Portfolio loans and leases:
Loans and leases		$ 45,618	$ 45,091

[1] Includes $599 and $600 of residential mortgage loans held for sale measured at fair value at March 31, 2023 and December 31, 2022, respectively.