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		Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Modifications
Total	[1],[2]	$ 107,911	$ 108,782
Commercial
Financing Receivable, Modifications
Year One		6,492	10,665
Year Two		5,521	4,149
Year Three		3,178	2,839
Year Four		1,864	1,767
Year Five		1,192	1,369
Prior		2,764	2,523
Revolving Loans		45,709	45,685
Revolving Loans Converted to Term Loans		0	0
Total		66,720	68,997
Commercial | Pass
Financing Receivable, Modifications
Year One		6,173	9,711
Year Two		5,237	3,901
Year Three		3,040	2,420
Year Four		1,628	1,604
Year Five		1,072	1,266
Prior		2,541	2,300
Revolving Loans		41,549	39,029
Revolving Loans Converted to Term Loans		0	0
Total		61,240	60,231
Commercial | Special mention
Financing Receivable, Modifications
Year One		85	448
Year Two		103	142
Year Three		64	205
Year Four		143	61
Year Five		24	43
Prior		62	47
Revolving Loans		1,493	3,388
Revolving Loans Converted to Term Loans		0	0
Total		1,974	4,334
Commercial | Substandard
Financing Receivable, Modifications
Year One		234	494
Year Two		181	104
Year Three		74	205
Year Four		93	102
Year Five		96	60
Prior		161	176
Revolving Loans		2,667	3,261
Revolving Loans Converted to Term Loans		0	0
Total		3,506	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		0	7
Revolving Loans Converted to Term Loans		0	0
Total		0	30
Commercial | Commercial and industrial loans
Financing Receivable, Modifications
Year One		4,144	7,227
Year Two		3,106	2,272
Year Three		1,557	1,397
Year Four		775	806
Year Five		502	515
Prior		933	828
Revolving Loans		36,817	36,620
Revolving Loans Converted to Term Loans		0	0
Total		47,834	49,665
Commercial | Commercial and industrial loans | Pass
Financing Receivable, Modifications
Year One		4,082	7,042
Year Two		3,016	2,144
Year Three		1,497	1,114
Year Four		684	700
Year Five		411	471
Prior		806	703
Revolving Loans		34,092	31,657
Revolving Loans Converted to Term Loans		0	0
Total		44,588	43,831
Commercial | Commercial and industrial loans | Special mention
Financing Receivable, Modifications
Year One		45	66
Year Two		29	46
Year Three		27	167
Year Four		24	46
Year Five		23	5
Prior		21	21
Revolving Loans		929	2,317
Revolving Loans Converted to Term Loans		0	0
Total		1,098	2,668
Commercial | Commercial and industrial loans | Substandard
Financing Receivable, Modifications
Year One		17	119
Year Two		61	80
Year Three		33	107
Year Four		67	60
Year Five		68	39
Prior		106	104
Revolving Loans		1,796	2,639
Revolving Loans Converted to Term Loans		0	0
Total		2,148	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		0	7
Revolving Loans Converted to Term Loans		0	0
Total		0	18
Commercial | Commercial mortgage owner-occupied loans
Financing Receivable, Modifications
Year One		856	1,316
Year Two		946	684
Year Three		595	465
Year Four		349	302
Year Five		217	264
Prior		494	467
Revolving Loans		1,329	1,177
Revolving Loans Converted to Term Loans		0	0
Total		4,786	4,675
Commercial | Commercial mortgage owner-occupied loans | Pass
Financing Receivable, Modifications
Year One		831	1,047
Year Two		889	655
Year Three		560	416
Year Four		333	288
Year Five		214	249
Prior		423	420
Revolving Loans		1,162	1,025
Revolving Loans Converted to Term Loans		0	0
Total		4,412	4,100
Commercial | Commercial mortgage owner-occupied loans | Special mention
Financing Receivable, Modifications
Year One		7	58
Year Two		25	12
Year Three		33	16
Year Four		3	7
Year Five		1	2
Prior		34	17
Revolving Loans		71	64
Revolving Loans Converted to Term Loans		0	0
Total		174	176
Commercial | Commercial mortgage owner-occupied loans | Substandard
Financing Receivable, Modifications
Year One		18	211
Year Two		32	17
Year Three		2	33
Year Four		13	7
Year Five		2	13
Prior		37	30
Revolving Loans		96	88
Revolving Loans Converted to Term Loans		0	0
Total		200	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		0	0
Revolving Loans Converted to Term Loans		0	0
Total		0	0
Commercial | Commercial mortgage nonowner-occupied loans
Financing Receivable, Modifications
Year One		615	1,315
Year Two		852	750
Year Three		650	614
Year Four		438	269
Year Five		190	261
Prior		396	375
Revolving Loans		2,373	2,343
Revolving Loans Converted to Term Loans		0	0
Total		5,514	5,927
Commercial | Commercial mortgage nonowner-occupied loans | Pass
Financing Receivable, Modifications
Year One		412	902
Year Two		762	679
Year Three		620	548
Year Four		326	247
Year Five		178	223
Prior		385	341
Revolving Loans		1,737	1,626
Revolving Loans Converted to Term Loans		0	0
Total		4,420	4,566
Commercial | Commercial mortgage nonowner-occupied loans | Special mention
Financing Receivable, Modifications
Year One		30	252
Year Two		5	68
Year Three		0	17
Year Four		110	8
Year Five		0	36
Prior		1	9
Revolving Loans		241	416
Revolving Loans Converted to Term Loans		0	0
Total		387	806
Commercial | Commercial mortgage nonowner-occupied loans | Substandard
Financing Receivable, Modifications
Year One		173	149
Year Two		85	3
Year Three		30	49
Year Four		2	14
Year Five		12	2
Prior		10	25
Revolving Loans		395	301
Revolving Loans Converted to Term Loans		0	0
Total		707	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		0	0
Revolving Loans Converted to Term Loans		0	0
Total		0	12
Commercial | Commercial construction loans
Financing Receivable, Modifications
Year One		48	173
Year Two		134	49
Year Three		47	27
Year Four		26	0
Year Five		0	9
Prior		11	12
Revolving Loans		5,190	5,545
Revolving Loans Converted to Term Loans		0	0
Total		5,456	5,815
Commercial | Commercial construction loans | Pass
Financing Receivable, Modifications
Year One		30	98
Year Two		95	49
Year Three		47	27
Year Four		26	0
Year Five		0	9
Prior		11	12
Revolving Loans		4,558	4,721
Revolving Loans Converted to Term Loans		0	0
Total		4,767	4,916
Commercial | Commercial construction loans | Special mention
Financing Receivable, Modifications
Year One		0	67
Year Two		39	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans		252	591
Revolving Loans Converted to Term Loans		0	0
Total		291	658
Commercial | Commercial construction loans | Substandard
Financing Receivable, Modifications
Year One		18	8
Year Two		0	0
Year Three		0	0
Year Four		0	0
Year Five		0	0
Prior		0	0
Revolving Loans		380	233
Revolving Loans Converted to Term Loans		0	0
Total		398	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		0	0
Revolving Loans Converted to Term Loans		0	0
Total		0	0
Commercial | Commercial leases
Financing Receivable, Modifications
Year One		829	634
Year Two		483	394
Year Three		329	336
Year Four		276	390
Year Five		283	320
Prior		930	841
Revolving Loans		0	0
Revolving Loans Converted to Term Loans		0	0
Total		3,130	2,915
Commercial | Commercial leases | Pass
Financing Receivable, Modifications
Year One		818	622
Year Two		475	374
Year Three		316	315
Year Four		259	369
Year Five		269	314
Prior		916	824
Revolving Loans		0	0
Revolving Loans Converted to Term Loans		0	0
Total		3,053	2,818
Commercial | Commercial leases | Special mention
Financing Receivable, Modifications
Year One		3	5
Year Two		5	16
Year Three		4	5
Year Four		6	0
Year Five		0	0
Prior		6	0
Revolving Loans		0	0
Revolving Loans Converted to Term Loans		0	0
Total		24	26
Commercial | Commercial leases | Substandard
Financing Receivable, Modifications
Year One		8	7
Year Two		3	4
Year Three		9	16
Year Four		11	21
Year Five		14	6
Prior		8	17
Revolving Loans		0	0
Revolving Loans Converted to Term Loans		0	0
Total		53	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		0	0
Revolving Loans Converted to Term Loans		0	0
Total		$ 0	$ 0

[1] Includes $156 and $161 of residential mortgage loans measured at fair value at September 30, 2021 and December 31, 2020, respectively.

[2] Includes $27 and $55 of other short-term investments, $383 and $756 of portfolio loans and leases, $(3) and $(7) of ALLL, $2 and $5 of other assets, $1 and $2 of other liabilities, and $325 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2021 and December 31, 2020, respectively. For further information, refer to Note 12.