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	6 Months Ended
		Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable, Modifications
Total	[1],[2]		$ 107,733		$ 108,782
Residential Mortgage
Financing Receivable, Modifications
Residential mortgage loans		$ 185	151	$ 185	161
Residential Mortgage | Federal Housing Administration Loan
Financing Receivable, Modifications
Losses due to claim denials and curtailments		$ 1	1	$ 2
Residential Mortgage | 30-89 days past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Total			65		103
Residential Mortgage | 90 days or more past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Total			163		242
Residential Mortgage | Residential mortgage loans
Financing Receivable, Modifications
Year One			3,081		4,008
Year Two			3,845		2,135
Year Three			1,701		834
Year Four			577		1,647
Year Five			1,236		2,312
Prior			5,540		4,831
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			15,980		15,767
Residential Mortgage | Residential mortgage loans | Performing
Financing Receivable, Modifications
Year One			3,081		4,007
Year Two			3,845		2,135
Year Three			1,701		832
Year Four			576		1,645
Year Five			1,233		2,309
Prior			5,495		4,779
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			15,931		15,707
Residential Mortgage | Residential mortgage loans | Performing | Current
Financing Receivable, Modifications
Year One			3,080		4,006
Year Two			3,840		2,128
Year Three			1,696		827
Year Four			574		1,635
Year Five			1,226		2,301
Prior			5,439		4,719
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			15,855		15,616
Residential Mortgage | Residential mortgage loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One			1		1
Year Two			2		1
Year Three			1		3
Year Four			0		3
Year Five			2		1
Prior			13		12
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			19		21
Residential Mortgage | Residential mortgage loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One			0		0
Year Two			3		6
Year Three			4		2
Year Four			2		7
Year Five			5		7
Prior			43		48
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			57		70
Residential Mortgage | Residential mortgage loans | Nonperforming
Financing Receivable, Modifications
Year One			0		1
Year Two			0		0
Year Three			0		2
Year Four			1		2
Year Five			3		3
Prior			45		52
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			49		60
Consumer
Financing Receivable, Modifications
Total			40,713		39,785
Consumer | Home equity
Financing Receivable, Modifications
Year One			1		11
Year Two			9		24
Year Three			18		30
Year Four			23		4
Year Five			3		2
Prior			148		168
Revolving Loans			4,334		4,933
Revolving Loans Converted to Term Loans			9		11
Total			4,545		5,183
Consumer | Home equity | Performing
Financing Receivable, Modifications
Year One			1		11
Year Two			9		24
Year Three			18		30
Year Four			23		4
Year Five			3		2
Prior			138		158
Revolving Loans			4,260		4,858
Revolving Loans Converted to Term Loans			8		10
Total			4,460		5,097
Consumer | Home equity | Performing | Current
Financing Receivable, Modifications
Year One			1		11
Year Two			9		24
Year Three			18		30
Year Four			23		4
Year Five			3		2
Prior			134		153
Revolving Loans			4,243		4,825
Revolving Loans Converted to Term Loans			8		10
Total			4,439		5,059
Consumer | Home equity | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			3		3
Revolving Loans			17		33
Revolving Loans Converted to Term Loans			0		0
Total			20		36
Consumer | Home equity | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			1		2
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			1		2
Consumer | Home equity | Nonperforming
Financing Receivable, Modifications
Year One			0		0
Year Two			0		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			10		10
Revolving Loans			74		75
Revolving Loans Converted to Term Loans			1		1
Total			85		86
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Year One			4,696		6,653
Year Two			5,315		3,800
Year Three			2,957		1,716
Year Four			1,275		882
Year Five			605		382
Prior			344		220
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			15,192		13,653
Consumer | Indirect secured consumer loans | Performing
Financing Receivable, Modifications
Year One			4,696		6,652
Year Two			5,286		3,795
Year Three			2,951		1,712
Year Four			1,268		879
Year Five			601		380
Prior			341		219
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			15,143		13,637
Consumer | Indirect secured consumer loans | Performing | Current
Financing Receivable, Modifications
Year One			4,691		6,626
Year Two			5,268		3,752
Year Three			2,930		1,678
Year Four			1,252		860
Year Five			593		372
Prior			337		214
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			15,071		13,502
Consumer | Indirect secured consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One			5		25
Year Two			17		41
Year Three			20		31
Year Four			15		17
Year Five			7		7
Prior			4		4
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			68		125
Consumer | Indirect secured consumer loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One			0		1
Year Two			1		2
Year Three			1		3
Year Four			1		2
Year Five			1		1
Prior			0		1
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			4		10
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Year One			0		1
Year Two			29		5
Year Three			6		4
Year Four			7		3
Year Five			4		2
Prior			3		1
Revolving Loans			0		0
Revolving Loans Converted to Term Loans			0		0
Total			49		16
Consumer | Credit card
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			1,793		2,007
Revolving Loans Converted to Term Loans			0		0
Total			1,793		2,007
Consumer | Credit card | Performing
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			1,766		1,975
Revolving Loans Converted to Term Loans			0		0
Total			1,766		1,975
Consumer | Credit card | Performing | Current
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			1,737		1,914
Revolving Loans Converted to Term Loans			0		0
Total			1,737		1,914
Consumer | Credit card | Performing | 30-89 days past due
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			15		30
Revolving Loans Converted to Term Loans			0		0
Total			15		30
Consumer | Credit card | Performing | 90 days or more past due
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			14		31
Revolving Loans Converted to Term Loans			0		0
Total			14		31
Consumer | Credit card | Nonperforming
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			27		32
Revolving Loans Converted to Term Loans			0		0
Total			27		32
Consumer | Other consumer loans
Financing Receivable, Modifications
Year One			452		885
Year Two			705		553
Year Three			386		441
Year Four			373		180
Year Five			139		32
Prior			57		41
Revolving Loans			939		881
Revolving Loans Converted to Term Loans			1		1
Total			3,052		3,014
Consumer | Other consumer loans | Performing
Financing Receivable, Modifications
Year One			452		885
Year Two			704		553
Year Three			386		441
Year Four			373		180
Year Five			139		32
Prior			57		40
Revolving Loans			938		880
Revolving Loans Converted to Term Loans			1		1
Total			3,050		3,012
Consumer | Other consumer loans | Performing | Current
Financing Receivable, Modifications
Year One			451		883
Year Two			702		546
Year Three			382		437
Year Four			371		178
Year Five			138		32
Prior			57		40
Revolving Loans			936		878
Revolving Loans Converted to Term Loans			1		1
Total			3,038		2,995
Consumer | Other consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One			1		2
Year Two			2		5
Year Three			3		4
Year Four			2		2
Year Five			1		0
Prior			0		0
Revolving Loans			2		2
Revolving Loans Converted to Term Loans			0		0
Total			11		15
Consumer | Other consumer loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One			0		0
Year Two			0		2
Year Three			1		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			1		2
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Year One			0		0
Year Two			1		0
Year Three			0		0
Year Four			0		0
Year Five			0		0
Prior			0		1
Revolving Loans			1		1
Revolving Loans Converted to Term Loans			0		0
Total			2		2
Residential Mortgage and Consumer
Financing Receivable, Modifications
Year One			8,230		11,557
Year Two			9,874		6,512
Year Three			5,062		3,021
Year Four			2,248		2,713
Year Five			1,983		2,728
Prior			6,089		5,260
Revolving Loans			7,066		7,821
Revolving Loans Converted to Term Loans			10		12
Total			40,562		39,624
Residential Mortgage and Consumer | Performing
Financing Receivable, Modifications
Year One			8,230		11,555
Year Two			9,844		6,507
Year Three			5,056		3,015
Year Four			2,240		2,708
Year Five			1,976		2,723
Prior			6,031		5,196
Revolving Loans			6,964		7,713
Revolving Loans Converted to Term Loans			9		11
Total			40,350		39,428
Residential Mortgage and Consumer | Performing | Current
Financing Receivable, Modifications
Year One			8,223		11,526
Year Two			9,819		6,450
Year Three			5,026		2,972
Year Four			2,220		2,677
Year Five			1,960		2,707
Prior			5,967		5,126
Revolving Loans			6,916		7,617
Revolving Loans Converted to Term Loans			9		11
Total			40,140		39,086
Residential Mortgage and Consumer | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One			7		28
Year Two			21		47
Year Three			24		38
Year Four			17		22
Year Five			10		8
Prior			20		19
Revolving Loans			34		65
Revolving Loans Converted to Term Loans			0		0
Total			133		227
Residential Mortgage and Consumer | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One			0		1
Year Two			4		10
Year Three			6		5
Year Four			3		9
Year Five			6		8
Prior			44		51
Revolving Loans			14		31
Revolving Loans Converted to Term Loans			0		0
Total			77		115
Residential Mortgage and Consumer | Nonperforming
Financing Receivable, Modifications
Year One			0		2
Year Two			30		5
Year Three			6		6
Year Four			8		5
Year Five			7		5
Prior			58		64
Revolving Loans			102		108
Revolving Loans Converted to Term Loans			1		1
Total			$ 212		$ 196

[1] Includes $151 and $161 of residential mortgage loans measured at fair value at June 30, 2021 and December 31, 2020, respectively.

[2] Includes $33 and $55 of other short-term investments, $455 and $756 of portfolio loans and leases, $(3) and $(7) of ALLL, $3 and $5 of other assets, $1 and $2 of other liabilities, and $400 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2021 and December 31, 2020, respectively. For further information, refer to Note 11.