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		Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Modifications
Total	[1],[2]	$ 108,855	$ 108,782
Commercial
Financing Receivable, Modifications
Year One		2,909	10,665
Year Two		9,717	4,149
Year Three		3,844	2,839
Year Four		2,480	1,767
Year Five		1,607	1,369
Prior		3,491	2,523
Revolving Loans Amortized Cost Basis		44,980	45,685
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		69,028	68,997
Commercial | Pass
Financing Receivable, Modifications
Year One		2,792	9,711
Year Two		8,908	3,901
Year Three		3,597	2,420
Year Four		2,061	1,604
Year Five		1,476	1,266
Prior		3,232	2,300
Revolving Loans Amortized Cost Basis		38,925	39,029
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		60,991	60,231
Commercial | Special mention
Financing Receivable, Modifications
Year One		27	448
Year Two		293	142
Year Three		131	205
Year Four		159	61
Year Five		30	43
Prior		57	47
Revolving Loans Amortized Cost Basis		2,510	3,388
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		3,207	4,334
Commercial | Substandard
Financing Receivable, Modifications
Year One		90	494
Year Two		516	104
Year Three		116	205
Year Four		260	102
Year Five		101	60
Prior		202	176
Revolving Loans Amortized Cost Basis		3,544	3,261
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		4,829	4,402
Commercial | Doubtful
Financing Receivable, Modifications
Year One		0	12
Year Two		0	2
Year Three		0	9
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		1	7
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		1	30
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Year One		1,832	7,227
Year Two		6,636	2,272
Year Three		2,034	1,397
Year Four		1,123	806
Year Five		713	515
Prior		1,207	828
Revolving Loans Amortized Cost Basis		35,549	36,620
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		49,094	49,665
Commercial | Commercial and industrial loans | Pass
Financing Receivable, Modifications
Year One		1,822	7,042
Year Two		6,472	2,144
Year Three		1,918	1,114
Year Four		884	700
Year Five		623	471
Prior		1,068	703
Revolving Loans Amortized Cost Basis		31,655	31,657
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		44,442	43,831
Commercial | Commercial and industrial loans | Special mention
Financing Receivable, Modifications
Year One		1	66
Year Two		60	46
Year Three		39	167
Year Four		90	46
Year Five		18	5
Prior		23	21
Revolving Loans Amortized Cost Basis		1,499	2,317
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		1,730	2,668
Commercial | Commercial and industrial loans | Substandard
Financing Receivable, Modifications
Year One		9	119
Year Two		104	80
Year Three		77	107
Year Four		149	60
Year Five		72	39
Prior		116	104
Revolving Loans Amortized Cost Basis		2,394	2,639
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		2,921	3,148
Commercial | Commercial and industrial loans | Doubtful
Financing Receivable, Modifications
Year One		0	0
Year Two		0	2
Year Three		0	9
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		1	7
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		1	18
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
Year One		263	1,316
Year Two		1,181	684
Year Three		664	465
Year Four		431	302
Year Five		285	264
Prior		670	467
Revolving Loans Amortized Cost Basis		1,258	1,177
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		4,752	4,675
Commercial | Commercial mortgage owner-occupied loans | Pass
Financing Receivable, Modifications
Year One		216	1,047
Year Two		998	655
Year Three		639	416
Year Four		393	288
Year Five		275	249
Prior		605	420
Revolving Loans Amortized Cost Basis		1,024	1,025
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		4,150	4,100
Commercial | Commercial mortgage owner-occupied loans | Special mention
Financing Receivable, Modifications
Year One		4	58
Year Two		55	12
Year Three		14	16
Year Four		6	7
Year Five		4	2
Prior		22	17
Revolving Loans Amortized Cost Basis		96	64
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		201	176
Commercial | Commercial mortgage owner-occupied loans | Substandard
Financing Receivable, Modifications
Year One		43	211
Year Two		128	17
Year Three		11	33
Year Four		32	7
Year Five		6	13
Prior		43	30
Revolving Loans Amortized Cost Basis		138	88
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		401	399
Commercial | Commercial mortgage owner-occupied loans | Doubtful
Financing Receivable, Modifications
Year One		0	0
Year Two		0	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		0	0
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
Year One		166	1,315
Year Two		1,164	750
Year Three		725	614
Year Four		586	269
Year Five		250	261
Prior		557	375
Revolving Loans Amortized Cost Basis		2,281	2,343
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		5,729	5,927
Commercial | Commercial mortgage nonowner-occupied loans | Pass
Financing Receivable, Modifications
Year One		107	902
Year Two		783	679
Year Three		642	548
Year Four		464	247
Year Five		239	223
Prior		522	341
Revolving Loans Amortized Cost Basis		1,466	1,626
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		4,223	4,566
Commercial | Commercial mortgage nonowner-occupied loans | Special mention
Financing Receivable, Modifications
Year One		22	252
Year Two		105	68
Year Three		60	17
Year Four		58	8
Year Five		8	36
Prior		9	9
Revolving Loans Amortized Cost Basis		299	416
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		561	806
Commercial | Commercial mortgage nonowner-occupied loans | Substandard
Financing Receivable, Modifications
Year One		37	149
Year Two		276	3
Year Three		23	49
Year Four		64	14
Year Five		3	2
Prior		26	25
Revolving Loans Amortized Cost Basis		516	301
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		945	543
Commercial | Commercial mortgage nonowner-occupied loans | Doubtful
Financing Receivable, Modifications
Year One		0	12
Year Two		0	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		0	12
Commercial | Commercial construction loans
Financing Receivable, Modifications
Year One		54	173
Year Two		165	49
Year Three		48	27
Year Four		27	0
Year Five		0	9
Prior		12	12
Revolving Loans Amortized Cost Basis		5,892	5,545
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		6,198	5,815
Commercial | Commercial construction loans | Pass
Financing Receivable, Modifications
Year One		54	98
Year Two		95	49
Year Three		48	27
Year Four		27	0
Year Five		0	9
Prior		12	12
Revolving Loans Amortized Cost Basis		4,780	4,721
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		5,016	4,916
Commercial | Commercial construction loans | Special mention
Financing Receivable, Modifications
Year One		0	67
Year Two		67	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		616	591
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		683	658
Commercial | Commercial construction loans | Substandard
Financing Receivable, Modifications
Year One		0	8
Year Two		3	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		496	233
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		499	241
Commercial | Commercial construction loans | Doubtful
Financing Receivable, Modifications
Year One		0	0
Year Two		0	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		0	0
Commercial | Commercial leases
Financing Receivable, Modifications
Year One		594	634
Year Two		571	394
Year Three		373	336
Year Four		313	390
Year Five		359	320
Prior		1,045	841
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		3,255	2,915
Commercial | Commercial leases | Pass
Financing Receivable, Modifications
Year One		593	622
Year Two		560	374
Year Three		350	315
Year Four		293	369
Year Five		339	314
Prior		1,025	824
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		3,160	2,818
Commercial | Commercial leases | Special mention
Financing Receivable, Modifications
Year One		0	5
Year Two		6	16
Year Three		18	5
Year Four		5	0
Year Five		0	0
Prior		3	0
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		32	26
Commercial | Commercial leases | Substandard
Financing Receivable, Modifications
Year One		1	7
Year Two		5	4
Year Three		5	16
Year Four		15	21
Year Five		20	6
Prior		17	17
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		63	71
Commercial | Commercial leases | Doubtful
Financing Receivable, Modifications
Year One		0	0
Year Two		0	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans Amortized Cost Basis		0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0	0
Total		$ 0	$ 0

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

[2] 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.