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Loans and allowance for loan losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		$ 18,344		$ 18,344		$ 19,234
Year two		15,460		15,460		15,083
Year three		12,360		12,360		17,786
Year four		15,149		15,149		11,704
Year five		9,759		9,759		8,328
Prior		30,693		30,693		28,783
Total	[1]	136,974		136,974		135,581
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one		13		25
Year two		36		70
Year three		24		67
Year four		30		72
Year five		8		28
Prior		20		96
Total		190	$ 154	506	$ 497
Residential Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total		1	1	4	4
Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total		78	$ 65	237	$ 181
Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		33,680		33,680		33,120
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans		58		145
Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		1,529		1,529		1,543
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans		1		3
Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2,989		2,989		2,277
Year two		1,941		1,941		1,372
Year three		1,267		1,267		4,571
Year four		4,405		4,405		3,628
Year five		3,691		3,691		2,439
Prior		10,249		10,249		8,773
Total		24,662		24,662		23,166
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one		0		0
Year two		0		0
Year three		0		0
Year four		0		1
Year five		0		0
Prior		1		3
Total		1		4
Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		120		120		106
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans		0		0
Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans		0		0
Home equity lines and loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		0		0		0
Year two		0		0		0
Year three		0		0		0
Year four		0		0		2
Year five		1		1		2
Prior		84		84		95
Total		4,730		4,730		4,592
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one		0		0
Year two		0		0
Year three		0		0
Year four		0		0
Year five		0		0
Prior		0		0
Total		1		3
Home equity lines and loans | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		3,270		3,270		3,085
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans		0		0
Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		1,375		1,375		1,408
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans		1		3
Recreational finance | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3,604		3,604		3,934
Year two		3,257		3,257		2,227
Year three		1,859		1,859		2,065
Year four		1,773		1,773		1,686
Year five		1,436		1,436		1,119
Prior		2,223		2,223		1,533
Total		14,152		14,152		12,564
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one		3		4
Year two		7		18
Year three		7		21
Year four		6		19
Year five		5		17
Prior		8		30
Total		36		109
Recreational finance | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans		0		0
Recreational finance | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans		0		0
Automobile | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		1,562		1,562		2,277
Year two		1,885		1,885		790
Year three		647		647		756
Year four		559		559		646
Year five		420		420		226
Prior		150		150		99
Total		5,223		5,223		4,794
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one		2		2
Year two		5		12
Year three		3		8
Year four		2		8
Year five		1		4
Prior		1		3
Total		14		37
Automobile | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans		0		0
Automobile | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans		0		0
Other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		274		274		265
Year two		178		178		155
Year three		106		106		104
Year four		66		66		72
Year five		50		50		16
Prior		24		24		18
Total		2,274		2,274		2,220
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one		5		12
Year two		3		11
Year three		2		7
Year four		1		3
Year five		0		1
Prior		0		1
Total		27		88
Other | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		1,574		1,574		1,588
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans		16		53
Other | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		2		2		2
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans		0		0
Current | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2,985		2,985		2,264
Year two		1,927		1,927		1,354
Year three		1,232		1,232		4,394
Year four		4,206		4,206		3,488
Year five		3,517		3,517		2,376
Prior		9,409		9,409		7,874
Total		23,395		23,395		21,853
Current | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		119		119		103
Current | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Current | Home equity lines and loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		0		0		0
Year two		0		0		0
Year three		0		0		0
Year four		0		0		2
Year five		1		1		2
Prior		80		80		91
Total		4,622		4,622		4,482
Current | Home equity lines and loans | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		3,269		3,269		3,085
Current | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		1,272		1,272		1,302
Current | Recreational finance | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3,597		3,597		3,918
Year two		3,236		3,236		2,203
Year three		1,836		1,836		2,044
Year four		1,753		1,753		1,661
Year five		1,419		1,419		1,100
Prior		2,191		2,191		1,503
Total		14,032		14,032		12,429
Current | Recreational finance | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Current | Recreational finance | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Current | Automobile | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		1,555		1,555		2,264
Year two		1,868		1,868		775
Year three		633		633		740
Year four		547		547		632
Year five		409		409		220
Prior		145		145		93
Total		5,157		5,157		4,724
Current | Automobile | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Current | Automobile | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Current | Other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		270		270		259
Year two		176		176		152
Year three		103		103		102
Year four		65		65		71
Year five		50		50		16
Prior		24		24		18
Total		2,240		2,240		2,134
Current | Other | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		1,551		1,551		1,515
Current | Other | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		1		1		1
30-89 days past due | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		4		4		12
Year two		8		8		9
Year three		17		17		111
Year four		107		107		77
Year five		76		76		38
Prior		403		403		472
Total		615		615		719
30-89 days past due | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
30-89 days past due | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
30-89 days past due | Home equity lines and loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
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
Total		31		31		29
30-89 days past due | Home equity lines and loans | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
30-89 days past due | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		30		30		27
30-89 days past due | Recreational finance | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		5		5		13
Year two		16		16		18
Year three		17		17		15
Year four		14		14		20
Year five		13		13		15
Prior		26		26		23
Total		91		91		104
30-89 days past due | Recreational finance | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
30-89 days past due | Recreational finance | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
30-89 days past due | Automobile | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		6		6		11
Year two		14		14		13
Year three		13		13		13
Year four		11		11		12
Year five		8		8		5
Prior		4		4		4
Total		56		56		58
30-89 days past due | Automobile | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
30-89 days past due | Automobile | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
30-89 days past due | Other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2		2		4
Year two		2		2		2
Year three		2		2		1
Year four		1		1		1
Year five		0		0		0
Prior		0		0		0
Total		22		22		23
30-89 days past due | Other | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		14		14		14
30-89 days past due | Other | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		1		1		1
Accruing Loans Past Due 90 Days or More | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		0		0		1
Year two		4		4		7
Year three		13		13		39
Year four		55		55		47
Year five		80		80		20
Prior		250		250		201
Total		402		402		315
Accruing Loans Past Due 90 Days or More | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
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
Total		0		0		0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Recreational finance | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
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
Total		0		0		0
Accruing Loans Past Due 90 Days or More | Recreational finance | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Recreational finance | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Automobile | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
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
Total		0		0		0
Accruing Loans Past Due 90 Days or More | Automobile | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Automobile | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Accruing Loans Past Due 90 Days or More | Other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
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
Total		8		8		8
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		8		8		8
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Nonaccrual | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		0		0		0
Year two		2		2		2
Year three		5		5		27
Year four		37		37		16
Year five		18		18		5
Prior		187		187		226
Total		250		250		279
Nonaccrual | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		1		1		3
Nonaccrual | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Nonaccrual | Home equity lines and loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
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		3		3		2
Total		77		77		81
Nonaccrual | Home equity lines and loans | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		1		1		0
Nonaccrual | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		73		73		79
Nonaccrual | Recreational finance | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2		2		3
Year two		5		5		6
Year three		6		6		6
Year four		6		6		5
Year five		4		4		4
Prior		6		6		7
Total		29		29		31
Nonaccrual | Recreational finance | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Nonaccrual | Recreational finance | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Nonaccrual | Automobile | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		1		1		2
Year two		3		3		2
Year three		1		1		3
Year four		1		1		2
Year five		3		3		1
Prior		1		1		2
Total		10		10		12
Nonaccrual | Automobile | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		0		0		0
Nonaccrual | Automobile | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		0		0		0
Nonaccrual | Other | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2		2		2
Year two		0		0		1
Year three		1		1		1
Year four		0		0		0
Year five		0		0		0
Prior		0		0		0
Total		4		4		55
Nonaccrual | Other | Revolving Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans		1		1		51
Nonaccrual | Other | Revolving Loans Converted to Term Loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans		$ 0		$ 0		$ 0
[1] Loans of $2.3 billion and $1.5 billion at September 30, 2025 and December 31, 2024, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes issued to third party investors were included in Long-term borrowings and were $1.9 billion at September 30, 2025 and $1.2 billion at December 31, 2024.

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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