Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Credit Risk Profile of the Bancorp's Residential Mortgage and Consumer Portfolio Segments by Class (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Modifications
Total	[1],[2]		$ 110,731		$ 109,558
Total loans and leases			108,157		108,356
Performing
Financing Receivable, Modifications
Total loans and leases					39,196
Nonperforming
Financing Receivable, Modifications
Total loans and leases					221
Residential mortgage loans
Financing Receivable, Modifications
Residential mortgage loans			174		183
Residential Mortgage
Financing Receivable, Modifications
Residential mortgage loans			174		183
Residential Mortgage | Federal Housing Administration Loan
Financing Receivable, Modifications
Losses due to claim denials and curtailments		$ 1	2	$ 1
Residential Mortgage | 30-89 days past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Past due			91		94
Residential Mortgage | 90 days or more past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Past due			249		261
Residential Mortgage | Residential mortgage loans
Financing Receivable, Modifications
2020			2,845
2019			2,354
2018			981
2017			1,890
2016			2,600
Prior			5,314
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			15,984
Total loans and leases					16,541
Past due					169
Residential Mortgage | Residential mortgage loans | 30-89 days past due
Financing Receivable, Modifications
Past due					27
Residential Mortgage | Residential mortgage loans | 90 days or more past due
Financing Receivable, Modifications
Past due					142
Residential Mortgage | Residential mortgage loans | Performing
Financing Receivable, Modifications
2020			2,845
2019			2,354
2018			981
2017			1,888
2016			2,597
Prior			5,250
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			15,915
Total loans and leases					16,450
Residential Mortgage | Residential mortgage loans | Performing | Current
Financing Receivable, Modifications
2020			2,843
2019			2,348
2018			976
2017			1,877
2016			2,589
Prior			5,191
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			15,824
Residential Mortgage | Residential mortgage loans | Performing | 30-89 days past due
Financing Receivable, Modifications
2020			2
2019			1
2018			3
2017			4
2016			3
Prior			11
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			24
Residential Mortgage | Residential mortgage loans | Performing | 90 days or more past due
Financing Receivable, Modifications
2020			0
2019			5
2018			2
2017			7
2016			5
Prior			48
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			67
Residential Mortgage | Residential mortgage loans | Nonperforming
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			2
2016			3
Prior			64
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			69
Total loans and leases					91
Consumer
Financing Receivable, Modifications
Total			39,481		39,600
Consumer | Home equity
Financing Receivable, Modifications
2020			11
2019			27
2018			36
2017			5
2016			3
Prior			181
Revolving Loans Amortized Cost Basis			5,183
Revolving Loans Converted to Term Loans Amortized Cost Basis			9
Total			5,455
Total loans and leases					6,083
Past due					118
Consumer | Home equity | 30-89 days past due
Financing Receivable, Modifications
Past due					61
Consumer | Home equity | 90 days or more past due
Financing Receivable, Modifications
Past due					57
Consumer | Home equity | Performing
Financing Receivable, Modifications
2020			11
2019			27
2018			35
2017			5
2016			3
Prior			169
Revolving Loans Amortized Cost Basis			5,108
Revolving Loans Converted to Term Loans Amortized Cost Basis			8
Total			5,366
Total loans and leases					5,989
Consumer | Home equity | Performing | Current
Financing Receivable, Modifications
2020			11
2019			27
2018			35
2017			5
2016			3
Prior			164
Revolving Loans Amortized Cost Basis			5,086
Revolving Loans Converted to Term Loans Amortized Cost Basis			8
Total			5,339
Consumer | Home equity | Performing | 30-89 days past due
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			3
Revolving Loans Amortized Cost Basis			22
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			25
Consumer | Home equity | Performing | 90 days or more past due
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			2
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			2
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
2020			0
2019			0
2018			1
2017			0
2016			0
Prior			12
Revolving Loans Amortized Cost Basis			75
Revolving Loans Converted to Term Loans Amortized Cost Basis			1
Total			89
Total loans and leases					94
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
2020			4,942
2019			4,230
2018			1,948
2017			1,032
2016			474
Prior			299
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			12,925
Total loans and leases					11,538
Past due					149
Consumer | Indirect secured consumer loans | 30-89 days past due
Financing Receivable, Modifications
Past due					132
Consumer | Indirect secured consumer loans | 90 days or more past due
Financing Receivable, Modifications
Past due					17
Consumer | Indirect secured consumer loans | Performing
Financing Receivable, Modifications
2020			4,942
2019			4,226
2018			1,944
2017			1,029
2016			472
Prior			296
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			12,909
Total loans and leases					11,531
Consumer | Indirect secured consumer loans | Performing | Current
Financing Receivable, Modifications
2020			4,928
2019			4,186
2018			1,909
2017			1,008
2016			462
Prior			290
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			12,783
Consumer | Indirect secured consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
2020			13
2019			38
2018			32
2017			19
2016			9
Prior			5
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			116
Consumer | Indirect secured consumer loans | Performing | 90 days or more past due
Financing Receivable, Modifications
2020			1
2019			2
2018			3
2017			2
2016			1
Prior			1
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			10
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
2020			0
2019			4
2018			4
2017			3
2016			2
Prior			3
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			16
Total loans and leases					7
Consumer | Credit card
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			2,087
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			2,087
Total loans and leases					2,532
Past due					98
Consumer | Credit card | 30-89 days past due
Financing Receivable, Modifications
Past due					50
Consumer | Credit card | 90 days or more past due
Financing Receivable, Modifications
Past due					48
Consumer | Credit card | Performing
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			2,061
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			2,061
Total loans and leases					2,505
Consumer | Credit card | Performing | Current
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			2,005
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			2,005
Consumer | Credit card | Performing | 30-89 days past due
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			29
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			29
Consumer | Credit card | Performing | 90 days or more past due
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			27
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			27
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			26
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			26
Total loans and leases					27
Consumer | Other consumer loans
Financing Receivable, Modifications
2020			607
2019			652
2018			506
2017			208
2016			37
Prior			37
Revolving Loans Amortized Cost Basis			808
Revolving Loans Converted to Term Loans Amortized Cost Basis			1
Total			2,856
Total loans and leases					2,723
Past due					21
Consumer | Other consumer loans | 30-89 days past due
Financing Receivable, Modifications
Past due					18
Consumer | Other consumer loans | 90 days or more past due
Financing Receivable, Modifications
Past due					3
Consumer | Other consumer loans | Performing
Financing Receivable, Modifications
2020			607
2019			652
2018			506
2017			208
2016			37
Prior			36
Revolving Loans Amortized Cost Basis			806
Revolving Loans Converted to Term Loans Amortized Cost Basis			1
Total			2,853
Total loans and leases					2,721
Consumer | Other consumer loans | Performing | Current
Financing Receivable, Modifications
2020			605
2019			645
2018			502
2017			205
2016			37
Prior			36
Revolving Loans Amortized Cost Basis			803
Revolving Loans Converted to Term Loans Amortized Cost Basis			1
Total			2,834
Consumer | Other consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
2020			2
2019			6
2018			4
2017			3
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			3
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			18
Consumer | Other consumer loans | Performing | 90 days or more past due
Financing Receivable, Modifications
2020			0
2019			1
2018			0
2017			0
2016			0
Prior			0
Revolving Loans Amortized Cost Basis			0
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			1
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
2020			0
2019			0
2018			0
2017			0
2016			0
Prior			1
Revolving Loans Amortized Cost Basis			2
Revolving Loans Converted to Term Loans Amortized Cost Basis			0
Total			3
Total loans and leases					2
Residential Mortgage and Consumer
Financing Receivable, Modifications
2020			8,405
2019			7,263
2018			3,471
2017			3,135
2016			3,114
Prior			5,831
Revolving Loans Amortized Cost Basis			8,078
Revolving Loans Converted to Term Loans Amortized Cost Basis			10
Total			$ 39,307
Total loans and leases					39,417
Past due					555
Residential Mortgage and Consumer | 30-89 days past due
Financing Receivable, Modifications
Past due					288
Residential Mortgage and Consumer | 90 days or more past due
Financing Receivable, Modifications
Past due					$ 267

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

[2] 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.