Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) - USD ($) $ in Millions		Jun. 30, 2020	Dec. 31, 2019
Loans and leases held for sale:
Loans and leases held for sale	[1]	$ 912	$ 1,400
Portfolio loans and leases:
Commercial and industrial loans		55,661	50,542
Commercial mortgage loans		11,233	10,963
Commercial construction loans		5,479	5,090
Commercial leases		3,061	3,363
Residential mortgage loans		16,457	16,724
Home equity		5,681	6,083
Indirect secured consumer loans		12,395	11,538
Credit card		2,211	2,532
Other consumer loans		2,875	2,723
Total portfolio loans and leases	[2],[3]	115,053	109,558
Residential mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		840	1,264
Commercial
Portfolio loans and leases:
Total portfolio loans and leases		75,434	69,958
Commercial | Commercial and industrial loans
Loans and leases held for sale:
Loans and leases held for sale		69	135
Portfolio loans and leases:
Total portfolio loans and leases		55,661
Loans and leases related to SBA Paycheck Protection Program of CARES Act		5,200
Commercial | Commercial mortgage loans
Loans and leases held for sale:
Loans and leases held for sale		3	1
Consumer
Portfolio loans and leases:
Total portfolio loans and leases		39,619	$ 39,600
Consumer | Residential mortgage loans | GNMA loans
Portfolio loans and leases:
Total portfolio loans and leases		$ 82

[1] Includes $840 and $1,264 of residential mortgage loans held for sale measured at fair value and $15 and $0 of commercial loans held for sale measured at fair value at June 30, 2020 and December 31, 2019, respectively.

[2] Includes $185 and $183 of residential mortgage loans measured at fair value at June 30, 2020 and December 31, 2019, respectively.

[3] Includes $66 and $74 of other short-term investments, $1,032 and $1,354 of portfolio loans and leases, $(14) and $(7) of ALLL, $7 and $8 of other assets, $2 and $2 of other liabilities, and $933 and $1,253 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2020 and December 31, 2019, respectively. For further information refer to Note 13.