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		Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Modifications
Total	[1],[2]	$ 115,053	$ 109,558
Total loans and leases		112,357	108,356
Commercial
Financing Receivable, Modifications
2020		9,375
2019		5,114
2018		3,486
2017		2,372
2016		1,711
Prior		3,919
Revolving Loans Amortized Cost Basis		49,457
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		75,434	69,958
Total loans and leases		75,434	69,958
Commercial | Pass
Financing Receivable, Modifications
2020		8,851
2019		4,781
2018		2,834
2017		2,048
2016		1,555
Prior		3,572
Revolving Loans Amortized Cost Basis		42,896
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		66,537
Total loans and leases			66,143
Commercial | Special mention
Financing Receivable, Modifications
2020		215
2019		186
2018		340
2017		135
2016		89
Prior		108
Revolving Loans Amortized Cost Basis		4,044
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		5,117
Total loans and leases			1,825
Commercial | Substandard
Financing Receivable, Modifications
2020		299
2019		132
2018		278
2017		183
2016		66
Prior		239
Revolving Loans Amortized Cost Basis		2,517
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		3,714
Total loans and leases			1,944
Commercial | Doubtful
Financing Receivable, Modifications
2020		10
2019		15
2018		34
2017		6
2016		1
Prior		0
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		66
Total loans and leases			46
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
2020		7,406
2019		3,089
2018		1,846
2017		1,133
2016		707
Prior		1,084
Revolving Loans Amortized Cost Basis		40,396
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		55,661
Total loans and leases		55,661	50,542
Commercial | Commercial and industrial loans | Pass
Financing Receivable, Modifications
2020		7,238
2019		2,849
2018		1,404
2017		966
2016		612
Prior		944
Revolving Loans Amortized Cost Basis		34,809
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		48,822
Total loans and leases			47,671
Commercial | Commercial and industrial loans | Special mention
Financing Receivable, Modifications
2020		62
2019		155
2018		213
2017		72
2016		42
Prior		21
Revolving Loans Amortized Cost Basis		3,300
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		3,865
Total loans and leases			1,423
Commercial | Commercial and industrial loans | Substandard
Financing Receivable, Modifications
2020		96
2019		70
2018		195
2017		89
2016		52
Prior		119
Revolving Loans Amortized Cost Basis		2,287
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		2,908
Total loans and leases			1,406
Commercial | Commercial and industrial loans | Doubtful
Financing Receivable, Modifications
2020		10
2019		15
2018		34
2017		6
2016		1
Prior		0
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		66
Total loans and leases			42
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
2020		986
2019		832
2018		549
2017		419
2016		300
Prior		636
Revolving Loans Amortized Cost Basis		1,192
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,914
Total loans and leases		4,914	4,880
Commercial | Commercial mortgage owner-occupied loans | Pass
Financing Receivable, Modifications
2020		828
2019		757
2018		473
2017		340
2016		278
Prior		568
Revolving Loans Amortized Cost Basis		1,069
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		4,313
Total loans and leases			4,421
Commercial | Commercial mortgage owner-occupied loans | Special mention
Financing Receivable, Modifications
2020		27
2019		23
2018		24
2017		27
2016		13
Prior		23
Revolving Loans Amortized Cost Basis		38
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		175
Total loans and leases			162
Commercial | Commercial mortgage owner-occupied loans | Substandard
Financing Receivable, Modifications
2020		131
2019		52
2018		52
2017		52
2016		9
Prior		45
Revolving Loans Amortized Cost Basis		85
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		426
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		909
2019		1,017
2018		667
2017		327
2016		312
Prior		524
Revolving Loans Amortized Cost Basis		2,563
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		6,319
Total loans and leases		6,319	6,083
Commercial | Commercial mortgage nonowner-occupied loans | Pass
Financing Receivable, Modifications
2020		757
2019		1,006
2018		584
2017		299
2016		294
Prior		444
Revolving Loans Amortized Cost Basis		2,106
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		5,490
Total loans and leases			5,866
Commercial | Commercial mortgage nonowner-occupied loans | Special mention
Financing Receivable, Modifications
2020		86
2019		4
2018		71
2017		17
2016		18
Prior		39
Revolving Loans Amortized Cost Basis		369
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		604
Total loans and leases			135
Commercial | Commercial mortgage nonowner-occupied loans | Substandard
Financing Receivable, Modifications
2020		66
2019		7
2018		12
2017		11
2016		0
Prior		41
Revolving Loans Amortized Cost Basis		88
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		225
Total loans and leases			82
Commercial | Commercial mortgage nonowner-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			0
Commercial | Commercial construction loans
Financing Receivable, Modifications
2020		65
2019		58
2018		28
2017		0
2016		10
Prior		12
Revolving Loans Amortized Cost Basis		5,306
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		5,479
Total loans and leases		5,479	5,090
Commercial | Commercial construction loans | Pass
Financing Receivable, Modifications
2020		19
2019		58
2018		28
2017		0
2016		10
Prior		12
Revolving Loans Amortized Cost Basis		4,912
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		5,039
Total loans and leases			4,963
Commercial | Commercial construction loans | Special mention
Financing Receivable, Modifications
2020		40
2019		0
2018		0
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		337
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		377
Total loans and leases			52
Commercial | Commercial construction loans | Substandard
Financing Receivable, Modifications
2020		6
2019		0
2018		0
2017		0
2016		0
Prior		0
Revolving Loans Amortized Cost Basis		57
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		63
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		9
2019		118
2018		396
2017		493
2016		382
Prior		1,663
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		3,061
Total loans and leases		3,061	3,363
Commercial | Commercial leases | Pass
Financing Receivable, Modifications
2020		9
2019		111
2018		345
2017		443
2016		361
Prior		1,604
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		2,873
Total loans and leases			3,222
Commercial | Commercial leases | Special mention
Financing Receivable, Modifications
2020		0
2019		4
2018		32
2017		19
2016		16
Prior		25
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		96
Total loans and leases			53
Commercial | Commercial leases | Substandard
Financing Receivable, Modifications
2020		0
2019		3
2018		19
2017		31
2016		5
Prior		34
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		92
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 $185 and $183 of residential mortgage loans measured at fair value at June 30, 2020 and December 31, 2019, respectively.

[2] Includes $66 and $74 of other short-term investments, $1,032 and $1,354 of portfolio loans and leases, $(14) and $(7) of ALLL, $7 and $8 of other assets, $2 and $2 of other liabilities, and $933 and $1,253 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2020 and December 31, 2019, respectively. For further information refer to Note 13.