Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Bancorp's Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Modifications
With an ALLL		$ 398	$ 333
No Related ALLL		214	206
Total loans and leases held for sale		612	539
Loans and leases held for sale	[1]	614	1,007
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		6	0
Nonperforming | Government Insured
Financing Receivable, Modifications
Total loans and leases held for sale		17	15
Commercial
Financing Receivable, Modifications
With an ALLL		235	149
No Related ALLL		46	114
Total loans and leases held for sale		281	263
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		225	114
No Related ALLL		37	101
Total loans and leases held for sale		262	215
Loans and leases held for sale		29	73
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		10	9
No Related ALLL		6	7
Total loans and leases held for sale		16	16
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		0	20
No Related ALLL		2	4
Total loans and leases held for sale		2	24
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL		0	6
No Related ALLL		0	2
Total loans and leases held for sale		0	8
Loans and leases held for sale		52	0
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		1	0
Total loans and leases held for sale		1	0
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		39	81
No Related ALLL		88	43
Total loans and leases held for sale		127	124
Consumer
Financing Receivable, Modifications
With an ALLL		124	103
No Related ALLL		38	25
Total loans and leases held for sale		162	128
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		23	45
No Related ALLL		35	22
Total loans and leases held for sale		58	67
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		28	26
No Related ALLL		3	3
Total loans and leases held for sale		31	29
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		32	27
No Related ALLL		0	0
Total loans and leases held for sale		32	27
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL		41	5
No Related ALLL		0	0
Total loans and leases held for sale		41	5
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		398	333
No Related ALLL		172	182
Total loans and leases held for sale		570	515
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		42	24
Total loans and leases held for sale		$ 42	$ 24

[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.