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		Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Modifications
With an ALLL		$ 469	$ 333
No Related ALLL		219	206
Total		688	539
Loans and leases held for sale	[1]	378	1,007
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		1	0
Nonperforming | Government Insured
Financing Receivable, Modifications
Total		19	15
Commercial
Financing Receivable, Modifications
With an ALLL		284	149
No Related ALLL		42	114
Total		326	263
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		273	114
No Related ALLL		31	101
Total		304	215
Loans and leases held for sale		41	73
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		11	9
No Related ALLL		6	7
Total		17	16
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		0	20
No Related ALLL		3	4
Total		3	24
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL		0	6
No Related ALLL		1	2
Total		1	8
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		1	0
Total		1	0
Loans and leases held for sale		3	0
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		26	81
No Related ALLL		98	43
Total		124	124
Consumer
Financing Receivable, Modifications
With an ALLL		159	103
No Related ALLL		40	25
Total		199	128
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		21	45
No Related ALLL		36	22
Total		57	67
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		32	26
No Related ALLL		4	3
Total		36	29
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		34	27
No Related ALLL		0	0
Total		34	27
Consumer | Other consumer loans:
Financing Receivable, Modifications
With an ALLL		72	5
No Related ALLL		0	0
Total		72	5
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		469	333
No Related ALLL		180	182
Total		649	515
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		39	24
Total		$ 39	$ 24

[1] Includes $334 and $600 of residential mortgage loans held for sale measured at fair value at December 31, 2023 and 2022, respectively.