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, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Modifications
Total	[1],[2]	$ 107,911	$ 107,911		$ 108,782
Residential Mortgage
Financing Receivable, Modifications
Residential mortgage loans		156	156	$ 174	161
Residential Mortgage | Federal Housing Administration Loan
Financing Receivable, Modifications
Losses due to claim denials and curtailments		1	2	$ 2
Residential Mortgage | 30-89 days past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Total		59	59		103
Residential Mortgage | 90 days or more past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Total		145	145		242
Residential Mortgage | Residential mortgage loans
Financing Receivable, Modifications
Year One		4,457	4,457		4,008
Year Two		3,590	3,590		2,135
Year Three		1,493	1,493		834
Year Four		491	491		1,647
Year Five		1,086	1,086		2,312
Prior		4,885	4,885		4,831
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		16,002	16,002		15,767
Residential Mortgage | Residential mortgage loans | Performing
Financing Receivable, Modifications
Year One		4,457	4,457		4,007
Year Two		3,590	3,590		2,135
Year Three		1,492	1,492		832
Year Four		491	491		1,645
Year Five		1,084	1,084		2,309
Prior		4,849	4,849		4,779
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		15,963	15,963		15,707
Residential Mortgage | Residential mortgage loans | Performing | Current
Financing Receivable, Modifications
Year One		4,454	4,454		4,006
Year Two		3,588	3,588		2,128
Year Three		1,488	1,488		827
Year Four		488	488		1,635
Year Five		1,075	1,075		2,301
Prior		4,790	4,790		4,719
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		15,883	15,883		15,616
Residential Mortgage | Residential mortgage loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One		3	3		1
Year Two		1	1		1
Year Three		1	1		3
Year Four		0	0		3
Year Five		1	1		1
Prior		13	13		12
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		19	19		21
Residential Mortgage | Residential mortgage loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One		0	0		0
Year Two		1	1		6
Year Three		3	3		2
Year Four		3	3		7
Year Five		8	8		7
Prior		46	46		48
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		61	61		70
Residential Mortgage | Residential mortgage loans | Nonperforming
Financing Receivable, Modifications
Year One		0	0		1
Year Two		0	0		0
Year Three		1	1		2
Year Four		0	0		2
Year Five		2	2		3
Prior		36	36		52
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		39	39		60
Consumer
Financing Receivable, Modifications
Total		41,191	41,191		39,785
Consumer | Home equity
Financing Receivable, Modifications
Year One		2	2		11
Year Two		7	7		24
Year Three		15	15		30
Year Four		20	20		4
Year Five		3	3		2
Prior		137	137		168
Revolving Loans		4,080	4,080		4,933
Revolving Loans Converted to Term Loans		12	12		11
Total		4,276	4,276		5,183
Consumer | Home equity | Performing
Financing Receivable, Modifications
Year One		2	2		11
Year Two		7	7		24
Year Three		15	15		30
Year Four		20	20		4
Year Five		3	3		2
Prior		127	127		158
Revolving Loans		4,013	4,013		4,858
Revolving Loans Converted to Term Loans		11	11		10
Total		4,198	4,198		5,097
Consumer | Home equity | Performing | Current
Financing Receivable, Modifications
Year One		2	2		11
Year Two		7	7		24
Year Three		15	15		30
Year Four		20	20		4
Year Five		3	3		2
Prior		124	124		153
Revolving Loans		3,992	3,992		4,825
Revolving Loans Converted to Term Loans		11	11		10
Total		4,174	4,174		5,059
Consumer | Home equity | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		2	2		3
Revolving Loans		21	21		33
Revolving Loans Converted to Term Loans		0	0		0
Total		23	23		36
Consumer | Home equity | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		1	1		2
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		1	1		2
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		10	10		10
Revolving Loans		67	67		75
Revolving Loans Converted to Term Loans		1	1		1
Total		78	78		86
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Year One		6,831	6,831		6,653
Year Two		4,748	4,748		3,800
Year Three		2,582	2,582		1,716
Year Four		1,086	1,086		882
Year Five		495	495		382
Prior		262	262		220
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		16,004	16,004		13,653
Consumer | Indirect secured consumer loans | Performing
Financing Receivable, Modifications
Year One		6,831	6,831		6,652
Year Two		4,729	4,729		3,795
Year Three		2,576	2,576		1,712
Year Four		1,080	1,080		879
Year Five		492	492		380
Prior		260	260		219
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		15,968	15,968		13,637
Consumer | Indirect secured consumer loans | Performing | Current
Financing Receivable, Modifications
Year One		6,818	6,818		6,626
Year Two		4,707	4,707		3,752
Year Three		2,552	2,552		1,678
Year Four		1,062	1,062		860
Year Five		483	483		372
Prior		255	255		214
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		15,877	15,877		13,502
Consumer | Indirect secured consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One		12	12		25
Year Two		21	21		41
Year Three		22	22		31
Year Four		16	16		17
Year Five		8	8		7
Prior		4	4		4
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		83	83		125
Consumer | Indirect secured consumer loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One		1	1		1
Year Two		1	1		2
Year Three		2	2		3
Year Four		2	2		2
Year Five		1	1		1
Prior		1	1		1
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		8	8		10
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Year One		0	0		1
Year Two		19	19		5
Year Three		6	6		4
Year Four		6	6		3
Year Five		3	3		2
Prior		2	2		1
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		36	36		16
Consumer | Credit card
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		1,744	1,744		2,007
Revolving Loans Converted to Term Loans		0	0		0
Total		1,744	1,744		2,007
Consumer | Credit card | Performing
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		1,720	1,720		1,975
Revolving Loans Converted to Term Loans		0	0		0
Total		1,720	1,720		1,975
Consumer | Credit card | Performing | Current
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		1,689	1,689		1,914
Revolving Loans Converted to Term Loans		0	0		0
Total		1,689	1,689		1,914
Consumer | Credit card | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		17	17		30
Revolving Loans Converted to Term Loans		0	0		0
Total		17	17		30
Consumer | Credit card | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		14	14		31
Revolving Loans Converted to Term Loans		0	0		0
Total		14	14		31
Consumer | Credit card | Nonperforming
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		24	24		32
Revolving Loans Converted to Term Loans		0	0		0
Total		24	24		32
Consumer | Other consumer loans
Financing Receivable, Modifications
Year One		589	589		885
Year Two		613	613		553
Year Three		329	329		441
Year Four		345	345		180
Year Five		122	122		32
Prior		52	52		41
Revolving Loans		958	958		881
Revolving Loans Converted to Term Loans		1	1		1
Total		3,009	3,009		3,014
Consumer | Other consumer loans | Performing
Financing Receivable, Modifications
Year One		589	589		885
Year Two		612	612		553
Year Three		329	329		441
Year Four		345	345		180
Year Five		122	122		32
Prior		52	52		40
Revolving Loans		957	957		880
Revolving Loans Converted to Term Loans		1	1		1
Total		3,007	3,007		3,012
Consumer | Other consumer loans | Performing | Current
Financing Receivable, Modifications
Year One		588	588		883
Year Two		610	610		546
Year Three		325	325		437
Year Four		343	343		178
Year Five		121	121		32
Prior		52	52		40
Revolving Loans		954	954		878
Revolving Loans Converted to Term Loans		1	1		1
Total		2,994	2,994		2,995
Consumer | Other consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One		1	1		2
Year Two		2	2		5
Year Three		3	3		4
Year Four		2	2		2
Year Five		1	1		0
Prior		0	0		0
Revolving Loans		3	3		2
Revolving Loans Converted to Term Loans		0	0		0
Total		12	12		15
Consumer | Other consumer loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One		0	0		0
Year Two		0	0		2
Year Three		1	1		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		0
Revolving Loans		0	0		0
Revolving Loans Converted to Term Loans		0	0		0
Total		1	1		2
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Year One		0	0		0
Year Two		1	1		0
Year Three		0	0		0
Year Four		0	0		0
Year Five		0	0		0
Prior		0	0		1
Revolving Loans		1	1		1
Revolving Loans Converted to Term Loans		0	0		0
Total		2	2		2
Residential Mortgage and Consumer
Financing Receivable, Modifications
Year One		11,879	11,879		11,557
Year Two		8,958	8,958		6,512
Year Three		4,419	4,419		3,021
Year Four		1,942	1,942		2,713
Year Five		1,706	1,706		2,728
Prior		5,336	5,336		5,260
Revolving Loans		6,782	6,782		7,821
Revolving Loans Converted to Term Loans		13	13		12
Total		41,035	41,035		39,624
Residential Mortgage and Consumer | Performing
Financing Receivable, Modifications
Year One		11,879	11,879		11,555
Year Two		8,938	8,938		6,507
Year Three		4,412	4,412		3,015
Year Four		1,936	1,936		2,708
Year Five		1,701	1,701		2,723
Prior		5,288	5,288		5,196
Revolving Loans		6,690	6,690		7,713
Revolving Loans Converted to Term Loans		12	12		11
Total		40,856	40,856		39,428
Residential Mortgage and Consumer | Performing | Current
Financing Receivable, Modifications
Year One		11,862	11,862		11,526
Year Two		8,912	8,912		6,450
Year Three		4,380	4,380		2,972
Year Four		1,913	1,913		2,677
Year Five		1,682	1,682		2,707
Prior		5,221	5,221		5,126
Revolving Loans		6,635	6,635		7,617
Revolving Loans Converted to Term Loans		12	12		11
Total		40,617	40,617		39,086
Residential Mortgage and Consumer | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One		16	16		28
Year Two		24	24		47
Year Three		26	26		38
Year Four		18	18		22
Year Five		10	10		8
Prior		19	19		19
Revolving Loans		41	41		65
Revolving Loans Converted to Term Loans		0	0		0
Total		154	154		227
Residential Mortgage and Consumer | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One		1	1		1
Year Two		2	2		10
Year Three		6	6		5
Year Four		5	5		9
Year Five		9	9		8
Prior		48	48		51
Revolving Loans		14	14		31
Revolving Loans Converted to Term Loans		0	0		0
Total		85	85		115
Residential Mortgage and Consumer | Nonperforming
Financing Receivable, Modifications
Year One		0	0		2
Year Two		20	20		5
Year Three		7	7		6
Year Four		6	6		5
Year Five		5	5		5
Prior		48	48		64
Revolving Loans		92	92		108
Revolving Loans Converted to Term Loans		1	1		1
Total		$ 179	$ 179		$ 196

[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.