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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Modifications
Total portfolio loans and leases	$ 178,528		$ 178,528		$ 122,651
Residential Mortgage
Financing Receivable, Modifications
Residential mortgage loans	102	$ 107	102	$ 107	106
Residential Mortgage \| Federal Housing Administration Loan
Financing Receivable, Modifications
Losses due to claim denials and curtailments	0	$ 0	0	$ 1
Residential Mortgage \| 30-89 days past due
Financing Receivable, Modifications
Residential mortgage loans	1		1		2
Residential Mortgage \| 30-89 days past due \| Federal Housing Administration Loan
Financing Receivable, Modifications
Total portfolio loans and leases	70		70		83
Residential Mortgage \| 90 days or more past due
Financing Receivable, Modifications
Residential mortgage loans	1		1
Residential Mortgage \| 90 days or more past due \| Federal Housing Administration Loan
Financing Receivable, Modifications
Total portfolio loans and leases	266		266		195
Residential Mortgage \| Nonperforming
Financing Receivable, Modifications
Residential mortgage loans	5		5		4
Residential Mortgage \| Residential mortgage loans
Financing Receivable, Modifications
Year One	1,160		1,160		1,871
Year Two	2,171		2,171		2,056
Year Three	2,019		2,019		907
Year Four	1,051		1,051		2,666
Year Five	2,780		2,780		4,123
Prior	10,430		10,430		5,923
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	19,611		19,611		17,546
Residential Mortgage \| Residential mortgage loans \| Performing \| Current
Financing Receivable, Modifications
Year One	1,159		1,159		1,871
Year Two	2,167		2,167		2,047
Year Three	1,998		1,998		897
Year Four	1,042		1,042		2,649
Year Five	2,758		2,758		4,095
Prior	10,259		10,259		5,800
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	19,383		19,383		17,359
Residential Mortgage \| Residential mortgage loans \| Performing \| 30-89 days past due
Financing Receivable, Modifications
Year One	1		1		0
Year Two	2		2		4
Year Three	10		10		2
Year Four	2		2		3
Year Five	5		5		8
Prior	27		27		15
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	47		47		32
Residential Mortgage \| Residential mortgage loans \| Performing \| 90 days or more past due
Financing Receivable, Modifications
Year One	0		0		0
Year Two	1		1		2
Year Three	3		3		1
Year Four	0		0		0
Year Five	1		1		3
Prior	5		5		4
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	10		10		10
Residential Mortgage \| Residential mortgage loans \| Nonperforming
Financing Receivable, Modifications
Year One	0		0		0
Year Two	1		1		3
Year Three	8		8		7
Year Four	7		7		14
Year Five	16		16		17
Prior	139		139		104
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	171		171		145
Consumer
Financing Receivable, Modifications
Total portfolio loans and leases	53,648		53,648		49,089
Consumer \| Residential mortgage loans
Financing Receivable, Modifications
Total portfolio loans and leases	19,713		19,713		17,652
Consumer \| Home equity
Financing Receivable, Modifications
Year One	96		96		194
Year Two	176		176		137
Year Three	120		120		51
Year Four	43		43		27
Year Five	25		25		1
Prior	71		71		82
Revolving and Other Loans	6,213		6,213		4,266
Revolving Loans Converted to Term Loans	185		185		88
Total portfolio loans and leases	6,929		6,929		4,846
Consumer \| Home equity \| Performing \| Current
Financing Receivable, Modifications
Year One	96		96		194
Year Two	176		176		137
Year Three	120		120		50
Year Four	42		42		27
Year Five	25		25		1
Prior	61		61		76
Revolving and Other Loans	6,073		6,073		4,182
Revolving Loans Converted to Term Loans	173		173		83
Total portfolio loans and leases	6,766		6,766		4,750
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	1		1		1
Revolving and Other Loans	29		29		23
Revolving Loans Converted to Term Loans	2		2		1
Total portfolio loans and leases	32		32		25
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	0		0		0
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	0		0		0
Consumer \| Home equity \| Nonperforming
Financing Receivable, Modifications
Year One	0		0		0
Year Two	0		0		0
Year Three	0		0		1
Year Four	1		1		0
Year Five	0		0		0
Prior	9		9		5
Revolving and Other Loans	111		111		61
Revolving Loans Converted to Term Loans	10		10		4
Total portfolio loans and leases	131		131		71
Consumer \| Indirect secured consumer loans
Financing Receivable, Modifications
Year One	4,029		4,029		7,881
Year Two	6,377		6,377		4,423
Year Three	3,508		3,508		1,917
Year Four	1,536		1,536		2,054
Year Five	1,626		1,626		1,241
Prior	1,110		1,110		448
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	18,186		18,186		17,964
Consumer \| Indirect secured consumer loans \| Performing \| Current
Financing Receivable, Modifications
Year One	4,023		4,023		7,854
Year Two	6,347		6,347		4,387
Year Three	3,474		3,474		1,881
Year Four	1,503		1,503		2,004
Year Five	1,586		1,586		1,213
Prior	1,083		1,083		435
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	18,016		18,016		17,774
Consumer \| Indirect secured consumer loans \| Performing \| 30-89 days past due
Financing Receivable, Modifications
Year One	5		5		23
Year Two	23		23		26
Year Three	23		23		24
Year Four	20		20		31
Year Five	23		23		17
Prior	14		14		8
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	108		108		129
Consumer \| Indirect secured consumer loans \| 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 and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	0		0		0
Consumer \| Indirect secured consumer loans \| Nonperforming
Financing Receivable, Modifications
Year One	1		1		4
Year Two	7		7		10
Year Three	11		11		12
Year Four	13		13		19
Year Five	17		17		11
Prior	13		13		5
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	62		62		61
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 and Other Loans	1,683		1,683		1,747
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	1,683		1,683		1,747
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 and Other Loans	1,623		1,623		1,683
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	1,623		1,623		1,683
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 and Other Loans	15		15		18
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	15		15		18
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 and Other Loans	16		16		17
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	16		16		17
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 and Other Loans	29		29		29
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	29		29		29
Consumer \| Solar energy installation loans
Financing Receivable, Modifications
Year One	70		70		816
Year Two	706		706		730
Year Three	673		673		1,939
Year Four	1,843		1,843		1,044
Year Five	995		995		1
Prior	27		27		30
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	4,314		4,314		4,560
Consumer \| Solar energy installation loans \| Performing \| Current
Financing Receivable, Modifications
Year One	67		67		814
Year Two	700		700		724
Year Three	666		666		1,914
Year Four	1,824		1,824		1,030
Year Five	983		983		1
Prior	27		27		29
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	4,267		4,267		4,512
Consumer \| Solar energy installation loans \| Performing \| 30-89 days past due
Financing Receivable, Modifications
Year One	0		0		1
Year Two	2		2		4
Year Three	5		5		14
Year Four	11		11		7
Year Five	6		6		0
Prior	0		0		0
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	24		24		26
Consumer \| Solar energy installation loans \| 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 and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	0		0		0
Consumer \| Solar energy installation loans \| Nonperforming
Financing Receivable, Modifications
Year One	3		3		1
Year Two	4		4		2
Year Three	2		2		11
Year Four	8		8		7
Year Five	6		6		0
Prior	0		0		1
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	23		23		22
Consumer \| Other consumer loans
Financing Receivable, Modifications
Year One	295		295		249
Year Two	281		281		105
Year Three	153		153		250
Year Four	255		255		385
Year Five	380		380		141
Prior	423		423		206
Revolving and Other Loans	1,018		1,018		960
Revolving Loans Converted to Term Loans	18		18		24
Total portfolio loans and leases	2,823		2,823		2,320
Consumer \| Other consumer loans \| Performing \| Current
Financing Receivable, Modifications
Year One	295		295		248
Year Two	278		278		104
Year Three	152		152		245
Year Four	252		252		377
Year Five	374		374		139
Prior	418		418		204
Revolving and Other Loans	1,017		1,017		957
Revolving Loans Converted to Term Loans	18		18		22
Total portfolio loans and leases	2,804		2,804		2,296
Consumer \| Other consumer loans \| Performing \| 30-89 days past due
Financing Receivable, Modifications
Year One	0		0		1
Year Two	2		2		1
Year Three	1		1		3
Year Four	2		2		5
Year Five	4		4		2
Prior	3		3		2
Revolving and Other Loans	1		1		1
Revolving Loans Converted to Term Loans	0		0		1
Total portfolio loans and leases	13		13		16
Consumer \| Other consumer loans \| 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		0
Revolving and Other Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	1		1		0
Consumer \| Other consumer loans \| Nonperforming
Financing Receivable, Modifications
Year One	0		0		0
Year Two	1		1		0
Year Three	0		0		2
Year Four	1		1		3
Year Five	2		2		0
Prior	1		1		0
Revolving and Other Loans	0		0		2
Revolving Loans Converted to Term Loans	0		0		1
Total portfolio loans and leases	5		5		8
Residential Mortgage and Consumer
Financing Receivable, Modifications
Year One	5,650		5,650		11,011
Year Two	9,711		9,711		7,451
Year Three	6,473		6,473		5,064
Year Four	4,728		4,728		6,176
Year Five	5,806		5,806		5,507
Prior	12,061		12,061		6,689
Revolving and Other Loans	8,914		8,914		6,973
Revolving Loans Converted to Term Loans	203		203		112
Total portfolio loans and leases	53,546		53,546		48,983
Residential Mortgage and Consumer \| Performing \| Current
Financing Receivable, Modifications
Year One	5,640		5,640		10,981
Year Two	9,668		9,668		7,399
Year Three	6,410		6,410		4,987
Year Four	4,663		4,663		6,087
Year Five	5,726		5,726		5,449
Prior	11,848		11,848		6,544
Revolving and Other Loans	8,713		8,713		6,822
Revolving Loans Converted to Term Loans	191		191		105
Total portfolio loans and leases	52,859		52,859		48,374
Residential Mortgage and Consumer \| Performing \| 30-89 days past due
Financing Receivable, Modifications
Year One	6		6		25
Year Two	29		29		35
Year Three	39		39		43
Year Four	35		35		46
Year Five	38		38		27
Prior	45		45		26
Revolving and Other Loans	45		45		42
Revolving Loans Converted to Term Loans	2		2		2
Total portfolio loans and leases	239		239		246
Residential Mortgage and Consumer \| Performing \| 90 days or more past due
Financing Receivable, Modifications
Year One	0		0		0
Year Two	1		1		2
Year Three	3		3		1
Year Four	0		0		0
Year Five	1		1		3
Prior	6		6		4
Revolving and Other Loans	16		16		17
Revolving Loans Converted to Term Loans	0		0		0
Total portfolio loans and leases	27		27		27
Residential Mortgage and Consumer \| Nonperforming
Financing Receivable, Modifications
Year One	4		4		5
Year Two	13		13		15
Year Three	21		21		33
Year Four	30		30		43
Year Five	41		41		28
Prior	162		162		115
Revolving and Other Loans	140		140		92
Revolving Loans Converted to Term Loans	10		10		5
Total portfolio loans and leases	$ 421		$ 421		$ 336

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