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		3 Months Ended	9 Months Ended
		Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Modifications
With an ALLL		$ 574	$ 574
No Related ALLL		357	357
Total		931	931
Interest Income Recognized		12	39
Nonaccrual portfolio loans and leases				$ 618
OREO and other repossessed personal property				62
Total nonperforming portfolio assets				680
Loans and leases held for sale	[1]	2,323	2,323	1,400
Total portfolio loans and leases	[2],[3]	110,731	110,731	109,558
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		10	10	7
Restructured loans held for sale		1	1
Nonperforming | Government Insured
Financing Receivable, Modifications
Total portfolio loans and leases		25	25	16
Restructured nonaccrual loans and leases		13	13	11
Commercial
Financing Receivable, Modifications
With an ALLL		468	468
No Related ALLL		220	220
Total		688	688
Interest Income Recognized		2	7
Nonaccrual portfolio loans and leases				397
Total portfolio loans and leases		71,250	71,250	69,958
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		354	354
No Related ALLL		164	164
Total		518	518
Interest Income Recognized		2	6
Nonaccrual portfolio loans and leases				338
Loans and leases held for sale		57	57	135
Total portfolio loans and leases		51,695	51,695
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		17	17
No Related ALLL		35	35
Total		52	52
Interest Income Recognized		0	0
Nonaccrual portfolio loans and leases				29
Total portfolio loans and leases		4,804	4,804
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		86	86
No Related ALLL		16	16
Total		102	102
Interest Income Recognized		0	0
Nonaccrual portfolio loans and leases				1
Total portfolio loans and leases		6,074	6,074
Commercial | Commercial construction loans
Financing Receivable, Modifications
Nonaccrual portfolio loans and leases				1
Total portfolio loans and leases		5,656	5,656
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		11	11
No Related ALLL		5	5
Total		16	16
Interest Income Recognized		0	1
Nonaccrual portfolio loans and leases				28
Total portfolio loans and leases		3,021	3,021
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		10	10
No Related ALLL		59	59
Total		69	69
Interest Income Recognized		7	22
Nonaccrual portfolio loans and leases				91
Consumer
Financing Receivable, Modifications
With an ALLL		96	96
No Related ALLL		38	38
Total		134	134
Interest Income Recognized		3	10
Nonaccrual portfolio loans and leases				130
Total portfolio loans and leases		39,481	39,481	39,600
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		58	58
No Related ALLL		31	31
Total		89	89
Interest Income Recognized		2	7
Nonaccrual portfolio loans and leases				94
Total portfolio loans and leases		5,455	5,455
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		89	89
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		9	9
No Related ALLL		7	7
Total		16	16
Interest Income Recognized		0	0
Nonaccrual portfolio loans and leases				7
Total portfolio loans and leases		12,925	12,925
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		16	16
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		26	26
No Related ALLL		0	0
Total		26	26
Interest Income Recognized		1	3
Nonaccrual portfolio loans and leases				27
Total portfolio loans and leases		2,087	2,087
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		26	26
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL		3	3
No Related ALLL		0	0
Total		3	3
Interest Income Recognized		0	0
Nonaccrual portfolio loans and leases				$ 2
Total portfolio loans and leases		2,856	2,856
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		3	3
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		574	574
No Related ALLL		317	317
Total		891	891
Interest Income Recognized		12	39
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0	0
No Related ALLL		40	40
Total		40	40
Interest Income Recognized		$ 0	$ 0

[1] Includes $1,472 and $1,264 of residential mortgage loans held for sale measured at fair value at September 30, 2020 and December 31, 2019, respectively.

[2] Includes $174 and $183 of residential mortgage loans measured at fair value at September 30, 2020 and December 31, 2019, respectively.

[3] Includes $61 and $74 of other short-term investments, $887 and $1,354 of portfolio loans and leases, $(9) and $(7) of ALLL, $5 and $8 of other assets, $2 and $2 of other liabilities, and $786 and $1,253 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2020 and December 31, 2019, respectively. For further information refer to Note 13.