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Loans and Leases and the Allowance for Credit Losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 9,545		$ 9,545		$ 18,423
Year two	16,667		16,667		21,683
Year three	19,766		19,766		15,025
Year four	13,567		13,567		10,555
Year five	9,431		9,431		10,062
Prior	33,184		33,184		27,464
Total	135,002		135,002		134,068
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	6		7
Year two	20		35
Year three	20		41
Year four	19		32
Year five	15		24
Prior	53		88
Total	180	$ 162	343	$ 257
Residential Real Estate
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total	2	1	3	3
Consumer:
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Total	57	$ 38	116	$ 82
Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	31,249		31,249		29,237
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	46		114
Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1,593		1,593		1,619
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	1		2
Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	974		974		1,746
Year two	1,466		1,466		4,876
Year three	4,738		4,738		3,858
Year four	3,746		3,746		2,615
Year five	2,533		2,533		1,261
Prior	8,597		8,597		7,901
Total	22,151		22,151		22,353
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	2		3
Total	2		3
Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	97		97		96
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
Residential — limited documentation | Residential Real Estate
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	852		852		911
Total	852		852		911
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	0		0
Residential — limited documentation | Revolving Loans | Residential Real Estate
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
Residential — limited documentation | 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		2
Year four	2		2		2
Year five	2		2		13
Prior	106		106		106
Total	4,561		4,561		4,649
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		2
Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	2,991		2,991		3,025
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	1,460		1,460		1,501
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans Converted to Term Loans	1		2
Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,205		2,205		2,667
Year two	2,378		2,378		2,359
Year three	2,145		2,145		1,884
Year four	1,711		1,711		1,306
Year five	1,180		1,180		797
Prior	1,641		1,641		1,045
Total	11,260		11,260		10,058
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	1		1
Year two	4		7
Year three	6		11
Year four	4		10
Year five	3		7
Prior	5		12
Total	23		48
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	1,291		1,291		1,073
Year two	948		948		1,114
Year three	926		926		1,067
Year four	847		847		438
Year five	329		329		206
Prior	182		182		94
Total	4,523		4,523		3,992
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	0		0
Year two	2		4
Year three	2		4
Year four	2		4
Year five	0		1
Prior	1		2
Total	7		15
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	148		148		255
Year two	198		198		180
Year three	143		143		121
Year four	96		96		33
Year five	23		23		13
Prior	23		23		19
Total	2,096		2,096		2,092
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Year one	4		5
Year two	3		6
Year three	2		5
Year four	2		3
Year five	0		1
Prior	2		2
Total	26		51
Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	1,463		1,463		1,467
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Revolving Loans	13		29
Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	2		2		4
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	971		971		1,726
Year two	1,452		1,452		4,709
Year three	4,584		4,584		3,732
Year four	3,639		3,639		2,543
Year five	2,475		2,475		1,215
Prior	7,808		7,808		7,060
Total	21,023		21,023		21,080
Current | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	94		94		95
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 | Residential — limited documentation | Residential Real Estate
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	762		762		825
Total	762		762		825
Current | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Current | Residential — limited documentation | 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		2
Year four	2		2		2
Year five	2		2		13
Prior	101		101		98
Total	4,449		4,449		4,528
Current | Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	2,990		2,990		3,022
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	1,354		1,354		1,391
Current | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,205		2,205		2,653
Year two	2,359		2,359		2,338
Year three	2,126		2,126		1,857
Year four	1,690		1,690		1,286
Year five	1,163		1,163		781
Prior	1,609		1,609		1,020
Total	11,152		11,152		9,935
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	1,287		1,287		1,063
Year two	937		937		1,096
Year three	910		910		1,047
Year four	832		832		427
Year five	322		322		198
Prior	171		171		87
Total	4,459		4,459		3,918
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	145		145		250
Year two	195		195		176
Year three	140		140		118
Year four	95		95		33
Year five	23		23		13
Prior	22		22		18
Total	2,011		2,011		2,003
Current | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	1,390		1,390		1,392
Current | Other | Revolving Loans Converted to Term Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1		1		3
30-89 days past due | Residential | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3		3		18
Year two	12		12		120
Year three	112		112		88
Year four	79		79		52
Year five	42		42		28
Prior	460		460		457
Total	709		709		763
30-89 days past due | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	1		1		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 | Residential — limited documentation | Residential Real Estate
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	35		35		31
Total	35		35		31
30-89 days past due | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
30-89 days past due | Residential — limited documentation | 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	2		2		3
Total	33		33		40
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	31		31		37
30-89 days past due | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		11
Year two	14		14		16
Year three	15		15		19
Year four	16		16		14
Year five	14		14		11
Prior	24		24		16
Total	83		83		87
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	3		3		8
Year two	9		9		15
Year three	14		14		17
Year four	13		13		9
Year five	6		6		6
Prior	8		8		5
Total	53		53		60
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		3
Year two	2		2		3
Year three	2		2		2
Year four	1		1		0
Year five	0		0		0
Prior	1		1		1
Total	20		20		30
30-89 days past due | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	11		11		20
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	1		1		30
Year three	21		21		28
Year four	18		18		17
Year five	14		14		14
Prior	160		160		205
Total	214		214		295
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 | Residential — limited documentation | Residential Real Estate
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 | Residential — limited documentation | 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 — limited documentation | 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	7		7		7
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	7		7		7
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		1
Year two	1		1		17
Year three	21		21		10
Year four	10		10		3
Year five	2		2		4
Prior	169		169		179
Total	205		205		215
Nonaccrual | Residential | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	2		2		1
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 | Residential — limited documentation | Residential Real Estate
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	55		55		55
Total	55		55		55
Nonaccrual | Residential — limited documentation | Revolving Loans | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
Nonaccrual | Residential — limited documentation | 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		5
Total	79		79		81
Nonaccrual | Home equity lines and loans | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	1		1		3
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	75		75		73
Nonaccrual | Recreational finance | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0		3
Year two	5		5		5
Year three	4		4		8
Year four	5		5		6
Year five	3		3		5
Prior	8		8		9
Total	25		25		36
Nonaccrual | Recreational finance | Revolving Loans | Consumer:
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	0		0		0
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Year two	2		2		3
Year three	2		2		3
Year four	2		2		2
Year five	1		1		2
Prior	3		3		2
Total	11		11		14
Nonaccrual | Automobile | Revolving Loans | Consumer:
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Year two	1		1		1
Year three	1		1		1
Year four	0		0		0
Year five	0		0		0
Prior	0		0		0
Total	58		58		52
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Financing Receivable, Credit Quality Indicator [Line Items]
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