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
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Modifications
Total portfolio loans and leases	$ 116,485		$ 117,234
Residential Mortgage
Financing Receivable, Modifications
Residential mortgage loans	113	$ 128	116
Residential Mortgage | Federal Housing Administration Loan
Financing Receivable, Modifications
Losses due to claim denials and curtailments	0	$ 0
Residential Mortgage | 30-89 days past due
Financing Receivable, Modifications
Residential mortgage loans			1
Residential Mortgage | 30-89 days past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Total portfolio loans and leases	69		79
Residential Mortgage | 90 days or more past due | Federal Housing Administration Loan
Financing Receivable, Modifications
Total portfolio loans and leases	127		141
Residential Mortgage | Nonperforming
Financing Receivable, Modifications
Residential mortgage loans	2		2
Residential Mortgage | 30-89 days past due
Financing Receivable, Modifications
Residential mortgage loans	1
Residential Mortgage | Residential mortgage loans
Financing Receivable, Modifications
Year One	285		995
Year Two	1,014		3,149
Year Three	3,116		5,014
Year Four	4,920		2,714
Year Five	2,661		949
Prior	4,886		4,089
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	16,882		16,910
Residential Mortgage | Residential mortgage loans | Performing | Current
Financing Receivable, Modifications
Year One	285		995
Year Two	1,013		3,139
Year Three	3,104		5,001
Year Four	4,905		2,703
Year Five	2,652		943
Prior	4,760		3,971
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	16,719		16,752
Residential Mortgage | Residential mortgage loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One	0		0
Year Two	1		3
Year Three	4		6
Year Four	6		5
Year Five	1		1
Prior	11		14
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	23		29
Residential Mortgage | Residential mortgage loans | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One	0		0
Year Two	0		1
Year Three	1		1
Year Four	1		1
Year Five	0		1
Prior	3		3
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	5		7
Residential Mortgage | Residential mortgage loans | Nonperforming
Financing Receivable, Modifications
Year One	0		0
Year Two	0		6
Year Three	7		6
Year Four	8		5
Year Five	8		4
Prior	112		101
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	135		122
Consumer
Financing Receivable, Modifications
Total portfolio loans and leases	44,569		44,488
Consumer | Residential mortgage loans
Financing Receivable, Modifications
Total portfolio loans and leases	16,995		17,026
Consumer | Home equity
Financing Receivable, Modifications
Year One	23		84
Year Two	80		41
Year Three	40		2
Year Four	2		6
Year Five	5		11
Prior	108		100
Revolving Loans	3,573		3,624
Revolving Loans Converted to Term Loans	52		48
Total portfolio loans and leases	3,883		3,916
Consumer | Home equity | Performing | Current
Financing Receivable, Modifications
Year One	23		84
Year Two	80		41
Year Three	40		2
Year Four	2		6
Year Five	5		11
Prior	99		92
Revolving Loans	3,498		3,549
Revolving Loans Converted to Term Loans	51		46
Total portfolio loans and leases	3,798		3,831
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	2		2
Revolving Loans	23		25
Revolving Loans Converted to Term Loans	0		1
Total portfolio loans and leases	25		28
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	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	0		0
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	7		6
Revolving Loans	52		50
Revolving Loans Converted to Term Loans	1		1
Total portfolio loans and leases	60		57
Consumer | Indirect secured consumer loans
Financing Receivable, Modifications
Year One	1,897		4,152
Year Two	3,764		4,393
Year Three	4,051		3,974
Year Four	3,549		1,552
Year Five	1,326		612
Prior	719		282
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	15,306		14,965
Consumer | Indirect secured consumer loans | Performing | Current
Financing Receivable, Modifications
Year One	1,895		4,126
Year Two	3,737		4,333
Year Three	4,000		3,925
Year Four	3,509		1,527
Year Five	1,308		597
Prior	699		271
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	15,148		14,779
Consumer | Indirect secured consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One	2		22
Year Two	23		49
Year Three	40		40
Year Four	32		19
Year Five	14		12
Prior	15		8
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	126		150
Consumer | Indirect secured consumer loans | 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	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	0		0
Consumer | Indirect secured consumer loans | Nonperforming
Financing Receivable, Modifications
Year One	0		4
Year Two	4		11
Year Three	11		9
Year Four	8		6
Year Five	4		3
Prior	5		3
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	32		36
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	1,737		1,865
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	1,737		1,865
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	1,667		1,789
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	1,667		1,789
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	19		21
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	19		21
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	19		21
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	19		21
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	32		34
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	32		34
Consumer | Solar energy installation loans
Financing Receivable, Modifications
Year One	251		2,456
Year Two	2,379		1,228
Year Three	1,201		2
Year Four	2		0
Year Five	0		0
Prior	38		42
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	3,871		3,728
Consumer | Solar energy installation loans | Performing | Current
Financing Receivable, Modifications
Year One	251		2,415
Year Two	2,336		1,192
Year Three	1,166		2
Year Four	2		0
Year Five	0		0
Prior	37		41
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	3,792		3,650
Consumer | Solar energy installation loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One	0		12
Year Two	9		6
Year Three	5		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 portfolio loans and leases	14		18
Consumer | Solar energy installation loans | 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	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	0		0
Consumer | Solar energy installation loans | Nonperforming
Financing Receivable, Modifications
Year One	0		29
Year Two	34		30
Year Three	30		0
Year Four	0		0
Year Five	0		0
Prior	1		1
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	65		60
Consumer | Other consumer loans
Financing Receivable, Modifications
Year One	64		518
Year Two	489		724
Year Three	666		333
Year Four	303		249
Year Five	226		104
Prior	207		156
Revolving Loans	775		861
Revolving Loans Converted to Term Loans	47		43
Total portfolio loans and leases	2,777		2,988
Consumer | Other consumer loans | Performing | Current
Financing Receivable, Modifications
Year One	64		511
Year Two	483		703
Year Three	651		328
Year Four	298		246
Year Five	224		101
Prior	203		154
Revolving Loans	774		859
Revolving Loans Converted to Term Loans	45		41
Total portfolio loans and leases	2,742		2,943
Consumer | Other consumer loans | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One	0		5
Year Two	4		15
Year Three	10		4
Year Four	4		2
Year Five	2		2
Prior	3		2
Revolving Loans	1		2
Revolving Loans Converted to Term Loans	1		1
Total portfolio loans and leases	25		33
Consumer | Other consumer loans | 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	0		0
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	0		0
Consumer | Other consumer loans | Nonperforming
Financing Receivable, Modifications
Year One	0		2
Year Two	2		6
Year Three	5		1
Year Four	1		1
Year Five	0		1
Prior	1		0
Revolving Loans	0		0
Revolving Loans Converted to Term Loans	1		1
Total portfolio loans and leases	10		12
Residential Mortgage and Consumer
Financing Receivable, Modifications
Year One	2,520		8,205
Year Two	7,726		9,535
Year Three	9,074		9,325
Year Four	8,776		4,521
Year Five	4,218		1,676
Prior	5,958		4,669
Revolving Loans	6,085		6,350
Revolving Loans Converted to Term Loans	99		91
Total portfolio loans and leases	44,456		44,372
Residential Mortgage and Consumer | Performing | Current
Financing Receivable, Modifications
Year One	2,518		8,131
Year Two	7,649		9,408
Year Three	8,961		9,258
Year Four	8,716		4,482
Year Five	4,189		1,652
Prior	5,798		4,529
Revolving Loans	5,939		6,197
Revolving Loans Converted to Term Loans	96		87
Total portfolio loans and leases	43,866		43,744
Residential Mortgage and Consumer | Performing | 30-89 days past due
Financing Receivable, Modifications
Year One	2		39
Year Two	37		73
Year Three	59		50
Year Four	42		26
Year Five	17		15
Prior	31		26
Revolving Loans	43		48
Revolving Loans Converted to Term Loans	1		2
Total portfolio loans and leases	232		279
Residential Mortgage and Consumer | Performing | 90 days or more past due
Financing Receivable, Modifications
Year One	0		0
Year Two	0		1
Year Three	1		1
Year Four	1		1
Year Five	0		1
Prior	3		3
Revolving Loans	19		21
Revolving Loans Converted to Term Loans	0		0
Total portfolio loans and leases	24		28
Residential Mortgage and Consumer | Nonperforming
Financing Receivable, Modifications
Year One	0		35
Year Two	40		53
Year Three	53		16
Year Four	17		12
Year Five	12		8
Prior	126		111
Revolving Loans	84		84
Revolving Loans Converted to Term Loans	2		2
Total portfolio loans and leases	$ 334		$ 321