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	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Modifications
With an ALLL	$ 406	$ 469
No Related ALLL	237	219
Total	643	688
Loans and leases held for sale (includes $512 and $334 of residential mortgage loans measured at fair value)	537	378
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale (includes $512 and $334 of residential mortgage loans measured at fair value)	4	1
Nonperforming | Government Insured
Financing Receivable, Modifications
Total	24	19
Commercial
Financing Receivable, Modifications
With an ALLL	213	284
No Related ALLL	61	42
Total	274	326
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL	198	273
No Related ALLL	36	31
Total	234	304
Loans and leases held for sale (includes $512 and $334 of residential mortgage loans measured at fair value)	22	41
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL	13	11
No Related ALLL	22	6
Total	35	17
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL	1	0
No Related ALLL	2	3
Total	3	3
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL	0	0
No Related ALLL	1	1
Total	1	1
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL	1	0
No Related ALLL	0	1
Total	1	1
Loans and leases held for sale (includes $512 and $334 of residential mortgage loans measured at fair value)	3	3
Residential Mortgage
Financing Receivable, Modifications
With an ALLL	37	26
No Related ALLL	92	98
Total	129	124
Consumer
Financing Receivable, Modifications
With an ALLL	156	159
No Related ALLL	47	40
Total	203	199
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL	20	21
No Related ALLL	41	36
Total	61	57
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL	30	32
No Related ALLL	6	4
Total	36	36
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL	31	34
No Related ALLL	0	0
Total	31	34
Consumer | Solar energy installation loans
Financing Receivable, Modifications
With an ALLL	66	60
No Related ALLL	0	0
Total	66	60
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL	9	12
No Related ALLL	0	0
Total	9	12
Nonaccrual portfolio loans and leases
Financing Receivable, Modifications
With an ALLL	406	469
No Related ALLL	200	180
Total	606	649
OREO and other repossessed property
Financing Receivable, Modifications
With an ALLL	0	0
No Related ALLL	37	39
Total	$ 37	$ 39