Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 378	$ 1,007
Portfolio loans and leases:
Total portfolio loans and leases	[2],[3]	117,234	121,480
Commercial
Portfolio loans and leases:
Total portfolio loans and leases		72,746	76,389
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		41	73
Portfolio loans and leases:
Total portfolio loans and leases		53,270	57,232
Commercial | Commercial leases
Loans and leases held for sale:
Loans and leases held for sale		3	0
Portfolio loans and leases:
Total portfolio loans and leases		2,579	2,704
Commercial | Commercial mortgage loans
Portfolio loans and leases:
Total portfolio loans and leases		11,276	11,020
Commercial | Commercial construction loans
Portfolio loans and leases:
Total portfolio loans and leases		5,621	5,433
Consumer
Portfolio loans and leases:
Total portfolio loans and leases		44,488	45,091
Consumer | Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		334	934
Portfolio loans and leases:
Total portfolio loans and leases		17,026	17,628
Consumer | Home equity
Portfolio loans and leases:
Total portfolio loans and leases		3,916	4,039
Consumer | Indirect secured consumer loans
Portfolio loans and leases:
Total portfolio loans and leases		14,965	16,552
Consumer | Credit card
Portfolio loans and leases:
Total portfolio loans and leases		1,865	1,874
Consumer | Other consumer loans:
Portfolio loans and leases:
Total portfolio loans and leases		$ 6,716	$ 4,998

[1] Includes $334 and $600 of residential mortgage loans held for sale measured at fair value at December 31, 2023 and 2022, respectively.

[2] Includes $55 and $17 of other short-term investments, $1,573 and $185 of portfolio loans and leases, $(28) and $(2) of ALLL, $10 and $2 of other assets, $14 and $9 of other liabilities and $1,409 and $118 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2023 and 2022, respectively. For further information, refer to Note 12.

[3] Includes $116 and $123 of residential mortgage loans measured at fair value at December 31, 2023 and 2022, respectively.