Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 614	$ 1,007
Portfolio loans and leases:
Total portfolio loans and leases	[2],[3]	120,088	121,480
Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		533	934
Commercial
Portfolio loans and leases:
Total portfolio loans and leases		75,118	76,389
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		29	73
Portfolio loans and leases:
Total portfolio loans and leases		55,790	57,232
Commercial | Commercial construction loans
Loans and leases held for sale:
Loans and leases held for sale		52	0
Portfolio loans and leases:
Total portfolio loans and leases		5,582	5,433
Commercial | Commercial mortgage loans
Portfolio loans and leases:
Total portfolio loans and leases		11,122	11,020
Commercial | Commercial leases
Portfolio loans and leases:
Total portfolio loans and leases		2,624	2,704
Consumer
Portfolio loans and leases:
Total portfolio loans and leases		44,970	45,091
Consumer | Residential mortgage loans
Portfolio loans and leases:
Total portfolio loans and leases		17,293	17,628
Consumer | Home equity
Portfolio loans and leases:
Total portfolio loans and leases		3,898	4,039
Consumer | Indirect secured consumer loans
Portfolio loans and leases:
Total portfolio loans and leases		15,434	16,552
Consumer | Credit card
Portfolio loans and leases:
Total portfolio loans and leases		1,817	1,874
Consumer | Other consumer loans
Portfolio loans and leases:
Total portfolio loans and leases		$ 6,528	$ 4,998

[1] Includes $497 and $600 of residential mortgage loans held for sale measured at fair value at September 30, 2023 and December 31, 2022, respectively.

[2] Includes $113 and $123 of residential mortgage loans measured at fair value at September 30, 2023 and December 31, 2022, respectively.

[3] Includes $59 and $17 of other short-term investments, $1,728 and $185 of portfolio loans and leases, $(27) and $(2) of ALLL, $11 and $2 of other assets, $15 and $9 of other liabilities, and $1,553 and $118 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2023 and December 31, 2022, respectively. For further information, refer to Note 12.