Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Modifications
Total	[1],[2]	$ 108,782	$ 109,558
Total loans and leases		106,329	108,356
Commercial
Financing Receivable, Modifications
2020		10,665
2019		4,149
2018		2,839
2017		1,767
2016		1,369
Prior		2,523
Revolving Loans Amortized Cost Basis		45,685
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		68,997	69,958
Total loans and leases		68,997	69,958
Commercial | Pass
Financing Receivable, Modifications
2020		9,711
2019		3,901
2018		2,420
2017		1,604
2016		1,266
Prior		2,300
Revolving Loans Amortized Cost Basis		39,029
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		60,231
Total loans and leases			66,143
Commercial | Special mention
Financing Receivable, Modifications
2020		448
2019		142
2018		205
2017		61
2016		43
Prior		47
Revolving Loans Amortized Cost Basis		3,388
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,334
Total loans and leases			1,825
Commercial | Substandard
Financing Receivable, Modifications
2020		494
2019		104
2018		205
2017		102
2016		60
Prior		176
Revolving Loans Amortized Cost Basis		3,261
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,402
Total loans and leases			1,944
Commercial | Doubtful
Financing Receivable, Modifications
2020		12
2019		2
2018		9
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		7
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		30
Total loans and leases			46
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
2020		7,227
2019		2,272
2018		1,397
2017		806
2016		515
Prior		828
Revolving Loans Amortized Cost Basis		36,620
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		49,665
Total loans and leases		49,665	50,542
Commercial | Commercial and industrial loans | Pass
Financing Receivable, Modifications
2020		7,042
2019		2,144
2018		1,114
2017		700
2016		471
Prior		703
Revolving Loans Amortized Cost Basis		31,657
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		43,831
Total loans and leases			47,671
Commercial | Commercial and industrial loans | Special mention
Financing Receivable, Modifications
2020		66
2019		46
2018		167
2017		46
2016		5
Prior		21
Revolving Loans Amortized Cost Basis		2,317
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		2,668
Total loans and leases			1,423
Commercial | Commercial and industrial loans | Substandard
Financing Receivable, Modifications
2020		119
2019		80
2018		107
2017		60
2016		39
Prior		104
Revolving Loans Amortized Cost Basis		2,639
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		3,148
Total loans and leases			1,406
Commercial | Commercial and industrial loans | Doubtful
Financing Receivable, Modifications
2020		0
2019		2
2018		9
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		7
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		18
Total loans and leases			42
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
2020		1,316
2019		684
2018		465
2017		302
2016		264
Prior		467
Revolving Loans Amortized Cost Basis		1,177
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,675
Total loans and leases		4,675	4,880
Commercial | Commercial mortgage owner-occupied loans | Pass
Financing Receivable, Modifications
2020		1,047
2019		655
2018		416
2017		288
2016		249
Prior		420
Revolving Loans Amortized Cost Basis		1,025
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,100
Total loans and leases			4,421
Commercial | Commercial mortgage owner-occupied loans | Special mention
Financing Receivable, Modifications
2020		58
2019		12
2018		16
2017		7
2016		2
Prior		17
Revolving Loans Amortized Cost Basis		64
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		176
Total loans and leases			162
Commercial | Commercial mortgage owner-occupied loans | Substandard
Financing Receivable, Modifications
2020		211
2019		17
2018		33
2017		7
2016		13
Prior		30
Revolving Loans Amortized Cost Basis		88
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		399
Total loans and leases			293
Commercial | Commercial mortgage owner-occupied loans | Doubtful
Financing Receivable, Modifications
2020		0
2019		0
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		0
Total loans and leases			4
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
2020		1,315
2019		750
2018		614
2017		269
2016		261
Prior		375
Revolving Loans Amortized Cost Basis		2,343
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		5,927
Total loans and leases		5,927	6,083
Commercial | Commercial mortgage nonowner-occupied loans | Pass
Financing Receivable, Modifications
2020		902
2019		679
2018		548
2017		247
2016		223
Prior		341
Revolving Loans Amortized Cost Basis		1,626
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,566
Total loans and leases			5,866
Commercial | Commercial mortgage nonowner-occupied loans | Special mention
Financing Receivable, Modifications
2020		252
2019		68
2018		17
2017		8
2016		36
Prior		9
Revolving Loans Amortized Cost Basis		416
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		806
Total loans and leases			135
Commercial | Commercial mortgage nonowner-occupied loans | Substandard
Financing Receivable, Modifications
2020		149
2019		3
2018		49
2017		14
2016		2
Prior		25
Revolving Loans Amortized Cost Basis		301
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		543
Total loans and leases			82
Commercial | Commercial mortgage nonowner-occupied loans | Doubtful
Financing Receivable, Modifications
2020		12
2019		0
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		12
Total loans and leases			0
Commercial | Commercial construction loans
Financing Receivable, Modifications
2020		173
2019		49
2018		27
2017		0
2016		9
Prior		12
Revolving Loans Amortized Cost Basis		5,545
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		5,815
Total loans and leases		5,815	5,090
Commercial | Commercial construction loans | Pass
Financing Receivable, Modifications
2020		98
2019		49
2018		27
2017		0
2016		9
Prior		12
Revolving Loans Amortized Cost Basis		4,721
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,916
Total loans and leases			4,963
Commercial | Commercial construction loans | Special mention
Financing Receivable, Modifications
2020		67
2019		0
2018		0
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		591
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		658
Total loans and leases			52
Commercial | Commercial construction loans | Substandard
Financing Receivable, Modifications
2020		8
2019		0
2018		0
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		233
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		241
Total loans and leases			75
Commercial | Commercial construction loans | Doubtful
Financing Receivable, Modifications
2020		0
2019		0
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		0
Total loans and leases			0
Commercial | Commercial leases
Financing Receivable, Modifications
2020		634
2019		394
2018		336
2017		390
2016		320
Prior		841
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		2,915
Total loans and leases		2,915	3,363
Commercial | Commercial leases | Pass
Financing Receivable, Modifications
2020		622
2019		374
2018		315
2017		369
2016		314
Prior		824
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		2,818
Total loans and leases			3,222
Commercial | Commercial leases | Special mention
Financing Receivable, Modifications
2020		5
2019		16
2018		5
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		26
Total loans and leases			53
Commercial | Commercial leases | Substandard
Financing Receivable, Modifications
2020		7
2019		4
2018		16
2017		21
2016		6
Prior		17
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		71
Total loans and leases			88
Commercial | Commercial leases | Doubtful
Financing Receivable, Modifications
2020		0
2019		0
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		$ 0
Total loans and leases			$ 0

[1] Includes $161 and $183 of residential mortgage loans measured at fair value at December 31, 2020 and 2019, respectively.

[2] Includes $55 and $74 of other short-term investments, $756 and $1,354 of portfolio loans and leases, $(7) and $(7) of ALLL, $5 and $8 of other assets, $2 and $2 of other liabilities and $656 and $1,253 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2020 and 2019, respectively. For further information, refer to Note 13.