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	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modifications
With an ALLL	$ 550	$ 469
No Related ALLL	303	219
Total	853	688
Loans and leases held for sale	640	378
Financing receivable, excluding accrued interest, modified in period, amount	552	615
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale	7	1
Nonperforming | Government Insured
Financing Receivable, Modifications
Total	18	19
Commercial
Financing Receivable, Modifications
With an ALLL	319	284
No Related ALLL	137	42
Total	456	326
Financing receivable, excluding accrued interest, modified in period, amount	424	453
Commercial | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	33	31
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL	265	273
No Related ALLL	109	31
Total	374	304
Loans and leases held for sale	15	41
Financing receivable, excluding accrued interest, modified in period, amount	232	245
Commercial | Commercial and industrial loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	19	31
Commercial | Commercial mortgage owner-occupied loans:
Financing Receivable, Modifications
With an ALLL	52	11
No Related ALLL	23	6
Total	75	17
Financing receivable, excluding accrued interest, modified in period, amount	61	27
Commercial | Commercial mortgage owner-occupied loans: | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	14	0
Commercial | Commercial mortgage nonowner-occupied loans:
Financing Receivable, Modifications
With an ALLL	0	0
No Related ALLL	4	3
Total	4	3
Financing receivable, excluding accrued interest, modified in period, amount	72	68
Commercial | Commercial mortgage nonowner-occupied loans: | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL	0	0
No Related ALLL	1	1
Total	1	1
Loans and leases held for sale	29	0
Financing receivable, excluding accrued interest, modified in period, amount	59	113
Commercial | Commercial construction loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL	2	0
No Related ALLL	0	1
Total	2	1
Loans and leases held for sale	0	3
Residential Mortgage
Financing Receivable, Modifications
With an ALLL	57	26
No Related ALLL	80	98
Total	137	124
Financing receivable, excluding accrued interest, modified in period, amount	89	113
Residential Mortgage | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	72	91
Consumer
Financing Receivable, Modifications
With an ALLL	174	159
No Related ALLL	56	40
Total	230	199
Financing receivable, excluding accrued interest, modified in period, amount	39	49
Consumer | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	2	2
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL	21	21
No Related ALLL	49	36
Total	70	57
Financing receivable, excluding accrued interest, modified in period, amount	15	16
Consumer | Home equity | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	2	2
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL	48	32
No Related ALLL	7	4
Total	55	36
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL	32	34
No Related ALLL	0	0
Total	32	34
Financing receivable, excluding accrued interest, modified in period, amount	20	27
Consumer | Credit card | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0
Consumer | Solar energy installation loans
Financing Receivable, Modifications
With an ALLL	64	60
No Related ALLL	0	0
Total	64	60
Financing receivable, excluding accrued interest, modified in period, amount	1	1
Consumer | Solar energy installation loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL	9	12
No Related ALLL	0	0
Total	9	12
Financing receivable, excluding accrued interest, modified in period, amount	3	5
Consumer | Other consumer loans | Term Extension and Payment Delay
Financing Receivable, Modifications
Financing receivable, excluding accrued interest, modified in period, amount	0	0
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL	550	469
No Related ALLL	273	180
Total	823	649
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL	0	0
No Related ALLL	30	39
Total	$ 30	$ 39