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		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable, Modifications
With an ALLL		$ 351		$ 351		$ 382
No Related ALLL		306		306		482
Total		657		657		864
Loans and leases held for sale	[1]	5,730		5,730		4,741
Total portfolio loans and leases	[2],[3]	107,733		107,733		108,782
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		13		13		5
Restructured loans held for sale		27		27		1
Nonperforming | Government Insured
Financing Receivable, Modifications
Total portfolio loans and leases		26		26		29
Restructured nonaccrual loans and leases		13		13		17
Commercial
Financing Receivable, Modifications
With an ALLL		221		221		274
No Related ALLL		188		188		364
Total		409		409		638
Interest Income Recognized		8	$ 3	18	$ 5
Total portfolio loans and leases		67,020		67,020		68,997
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		181		181		213
No Related ALLL		167		167		260
Total		348		348		473
Interest Income Recognized		4	3	9	4
Loans and leases held for sale		11		11		230
Total portfolio loans and leases		47,564		47,564		49,665
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		11		11		20
No Related ALLL		17		17		60
Total		28		28		80
Interest Income Recognized		2	0	7	0
Total portfolio loans and leases		4,757		4,757		4,675
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		23		23		34
No Related ALLL		1		1		43
Total		24		24		77
Interest Income Recognized		2	0	2	0
Total portfolio loans and leases		5,590		5,590		5,927
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL		0		0		1
No Related ALLL		0		0		0
Total		0		0		1
Loans and leases held for sale		2		2		0
Total portfolio loans and leases		5,871		5,871		5,815
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		6		6		6
No Related ALLL		3		3		1
Total		9		9		7
Interest Income Recognized		0	0	0	1
Loans and leases held for sale		0		0		39
Total portfolio loans and leases		3,238		3,238		2,915
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		3		3		11
No Related ALLL		46		46		49
Total		49		49		60
Interest Income Recognized		6	7	13	15
Consumer
Financing Receivable, Modifications
With an ALLL		127		127		97
No Related ALLL		36		36		39
Total		163		163		136
Interest Income Recognized		3	3	7	7
Total portfolio loans and leases		40,713		40,713		39,785
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		56		56		55
No Related ALLL		29		29		31
Total		85		85		86
Interest Income Recognized		2	2	4	5
Total portfolio loans and leases		4,545		4,545		5,183
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		85		85		86
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		42		42		8
No Related ALLL		7		7		8
Total		49		49		16
Interest Income Recognized		0	0	1	0
Total portfolio loans and leases		15,192		15,192		13,653
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		49		49		16
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		27		27		32
No Related ALLL		0		0		0
Total		27		27		32
Interest Income Recognized		1	1	2	2
Total portfolio loans and leases		1,793		1,793		2,007
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		27		27		32
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL		2		2		2
No Related ALLL		0		0		0
Total		2		2		2
Total portfolio loans and leases		3,052		3,052		3,014
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		2		2		2
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		351		351		382
No Related ALLL		270		270		452
Total		621		621		834
Interest Income Recognized		17	$ 13	38	$ 27
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0		0		0
No Related ALLL		36		36		30
Total		$ 36		$ 36		$ 30

[1] Includes $1,633 and $1,481 of residential mortgage loans held for sale measured at fair value at June 30, 2021 and December 31, 2020, respectively.

[2] Includes $151 and $161 of residential mortgage loans measured at fair value at June 30, 2021 and December 31, 2020, respectively.

[3] Includes $33 and $55 of other short-term investments, $455 and $756 of portfolio loans and leases, $(3) and $(7) of ALLL, $3 and $5 of other assets, $1 and $2 of other liabilities, and $400 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2021 and December 31, 2020, respectively. For further information, refer to Note 11.