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
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Modifications
With an ALLL		$ 361		$ 382
No Related ALLL		422		482
Total		783		864
Interest Income Recognized		21	$ 14
Loans and leases held for sale	[1]	5,477		4,741
Total portfolio loans and leases	[2],[3]	108,855		108,782
Nonperforming
Financing Receivable, Modifications
Loans and leases held for sale		2		5
Restructured loans held for sale		20		1
Nonperforming | Government Insured
Financing Receivable, Modifications
Total portfolio loans and leases		30		29
Restructured nonaccrual loans and leases		16		17
Commercial
Financing Receivable, Modifications
With an ALLL		218		274
No Related ALLL		291		364
Total		509		638
Interest Income Recognized		11	2
Total portfolio loans and leases		69,028		68,997
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
With an ALLL		161		213
No Related ALLL		198		260
Total		359		473
Interest Income Recognized		5	1
Loans and leases held for sale		71		230
Total portfolio loans and leases		49,094		49,665
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
With an ALLL		15		20
No Related ALLL		57		60
Total		72		80
Interest Income Recognized		5	0
Total portfolio loans and leases		4,752		4,675
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
With an ALLL		34		34
No Related ALLL		36		43
Total		70		77
Interest Income Recognized		1	0
Total portfolio loans and leases		5,729		5,927
Commercial | Commercial construction loans
Financing Receivable, Modifications
With an ALLL		2		1
No Related ALLL		0		0
Total		2		1
Interest Income Recognized		0	0
Total portfolio loans and leases		6,198		5,815
Commercial | Commercial leases
Financing Receivable, Modifications
With an ALLL		6		6
No Related ALLL		0		1
Total		6		7
Interest Income Recognized		0	1
Loans and leases held for sale		0		39
Total portfolio loans and leases		3,255		2,915
Residential Mortgage
Financing Receivable, Modifications
With an ALLL		5		11
No Related ALLL		51		49
Total		56		60
Interest Income Recognized		7	8
Consumer
Financing Receivable, Modifications
With an ALLL		138		97
No Related ALLL		38		39
Total		176		136
Interest Income Recognized		3	4
Total portfolio loans and leases		39,827		39,785
Consumer | Home equity
Financing Receivable, Modifications
With an ALLL		60		55
No Related ALLL		30		31
Total		90		86
Interest Income Recognized		2	3
Total portfolio loans and leases		4,815		5,183
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		90		86
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
With an ALLL		45		8
No Related ALLL		8		8
Total		53		16
Interest Income Recognized		0	0
Total portfolio loans and leases		14,336		13,653
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		53		16
Consumer | Credit card
Financing Receivable, Modifications
With an ALLL		30		32
No Related ALLL		0		0
Total		30		32
Interest Income Recognized		1	1
Total portfolio loans and leases		1,810		2,007
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		30		32
Consumer | Other consumer loans
Financing Receivable, Modifications
With an ALLL		3		2
No Related ALLL		0		0
Total		3		2
Interest Income Recognized		0	0
Total portfolio loans and leases		3,090		3,014
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Total portfolio loans and leases		3		2
Nonaccrual Portfolio Loans and Leases
Financing Receivable, Modifications
With an ALLL		361		382
No Related ALLL		380		452
Total		741		834
Interest Income Recognized		21	14
OREO and Other Repossessed Assets
Financing Receivable, Modifications
With an ALLL		0		0
No Related ALLL		42		30
Total		42		$ 30
Interest Income Recognized		$ 0	$ 0

[1] Includes $1,801 and $1,481 of residential mortgage loans held for sale measured at fair value and $9 and $0 of commercial loans held for sale measured at fair value at March 31, 2021 and December 31, 2020, respectively.

[2] Includes $153 and $161 of residential mortgage loans measured at fair value at March 31, 2021 and December 31, 2020, respectively.

[3] Includes $54 and $55 of other short-term investments, $633 and $756 of portfolio loans and leases, $(5) and $(7) of ALLL, $4 and $5 of other assets, $1 and $2 of other liabilities, and $540 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2021 and December 31, 2020, respectively. For further information, refer to Note 11.