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		Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Modifications
With an ALLL		$ 483	$ 333
No Related ALLL		140	206
Total		623	539
Loans and leases held for sale	[1]	749	1,007
Total portfolio loans and leases		122,857	121,480
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		0	0
Nonperforming | Government Insured
Financing Receivable, Modifications
Total portfolio loans and leases		17	15
Commercial
Financing Receivable, Modifications
With an ALLL		275	149
No Related ALLL		59	114
Total		334	263
Total portfolio loans and leases		77,239	76,389
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		239	114
No Related ALLL		41	101
Total		280	215
Loans and leases held for sale		21	73
Total portfolio loans and leases		57,720	57,232
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		11	9
No Related ALLL		11	7
Total		22	16
Total portfolio loans and leases		5,395	5,258
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		18	20
No Related ALLL		4	4
Total		22	24
Total portfolio loans and leases		5,833	5,762
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL		3	6
No Related ALLL		2	2
Total		5	8
Total portfolio loans and leases		5,548	5,433
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		4	0
No Related ALLL		1	0
Total		5	0
Loans and leases held for sale		3	0
Total portfolio loans and leases		2,743	2,704
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		92	81
No Related ALLL		37	43
Total		129	124
Consumer
Financing Receivable, Modifications
With an ALLL		116	103
No Related ALLL		14	25
Total		130	128
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		55	45
No Related ALLL		13	22
Total		68	67
Total portfolio loans and leases		3,958	4,039
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		68	67
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		26	26
No Related ALLL		1	3
Total		27	29
Total portfolio loans and leases		16,484	16,552
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		27	29
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		29	27
No Related ALLL		0	0
Total		29	27
Total portfolio loans and leases		1,761	1,874
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		29	27
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL		6	5
No Related ALLL		0	0
Total		6	5
Total portfolio loans and leases		5,807	4,998
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		6	5
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		483	333
No Related ALLL		110	182
Total		593	515
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		30	24
Total		$ 30	$ 24

[1] Includes $599 and $600 of residential mortgage loans held for sale measured at fair value at March 31, 2023 and December 31, 2022, respectively.