Quarterly report [Sections 13 or 15(d)]

Outstanding Loans and Leases and Allowance for Credit Losses - Home Equity - Credit Quality Indicators Including Vintage (Details)

Outstanding Loans and Leases and Allowance for Credit Losses - Home Equity - Credit Quality Indicators Including Vintage (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 1,217,619		$ 1,217,619		$ 1,185,700
Total gross charge-offs	1,740	$ 1,824	3,477	$ 3,557
Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross charge-offs	16	$ 14	32	$ 20
Consumer real estate \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	27,114		27,114		26,823
Total gross charge-offs			14		16
Consumer real estate \| Home equity \| Less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	693		693		701
Consumer real estate \| Home equity \| Greater than or equal to 620 and less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	573		573		595
Consumer real estate \| Home equity \| Greater than or equal to 660 and less than 740
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	4,980		4,980		5,036
Consumer real estate \| Home equity \| Greater than or equal to 740
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	20,868		20,868		20,491
Consumer real estate \| Home Equity Loans and Reverse Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	648		648		697
Total gross charge-offs			0		0
Consumer real estate \| Home Equity Loans and Reverse Mortgages \| Less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	63		63		67
Consumer real estate \| Home Equity Loans and Reverse Mortgages \| Greater than or equal to 620 and less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	41		41		44
Consumer real estate \| Home Equity Loans and Reverse Mortgages \| Greater than or equal to 660 and less than 740
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	153		153		173
Consumer real estate \| Home Equity Loans and Reverse Mortgages \| Greater than or equal to 740
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	391		391		413
Consumer real estate \| Reverse Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	430		430		457
Consumer real estate \| Home Equity Loan no Longer Originated
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	218		218		240
Consumer real estate \| Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	23,372		23,372		23,023
Gross charge-offs, Revolving Loans			10		10
Consumer real estate \| Revolving Loans \| Less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	418		418		399
Consumer real estate \| Revolving Loans \| Greater than or equal to 620 and less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	372		372		375
Consumer real estate \| Revolving Loans \| Greater than or equal to 660 and less than 740
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	4,046		4,046		4,057
Consumer real estate \| Revolving Loans \| Greater than or equal to 740
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	18,536		18,536		18,192
Consumer real estate \| Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	3,094		3,094		3,103
Gross charge-offs, Revolving Loans Converted to Term Loans			4		6
Consumer real estate \| Revolving Loans Converted to Term Loans \| Less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	212		212		235
Consumer real estate \| Revolving Loans Converted to Term Loans \| Greater than or equal to 620 and less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	160		160		176
Consumer real estate \| Revolving Loans Converted to Term Loans \| Greater than or equal to 660 and less than 740
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	781		781		806
Consumer real estate \| Revolving Loans Converted to Term Loans \| Greater than or equal to 740
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	1,941		1,941		1,886
Less than or equal to 90 percent \| Consumer real estate \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	26,955		26,955		26,686
Less than or equal to 90 percent \| Consumer real estate \| Home Equity Loans and Reverse Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	636		636		687
Less than or equal to 90 percent \| Consumer real estate \| Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	23,237		23,237		22,909
Less than or equal to 90 percent \| Consumer real estate \| Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	3,082		3,082		3,090
Greater than 90 percent but less than or equal to 100 percent \| Consumer real estate \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	90		90		70
Greater than 90 percent but less than or equal to 100 percent \| Consumer real estate \| Home Equity Loans and Reverse Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	5		5		3
Greater than 90 percent but less than or equal to 100 percent \| Consumer real estate \| Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	81		81		63
Greater than 90 percent but less than or equal to 100 percent \| Consumer real estate \| Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	4		4		4
Greater than 100 percent \| Consumer real estate \| Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	69		69		67
Greater than 100 percent \| Consumer real estate \| Home Equity Loans and Reverse Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	7		7		7
Greater than 100 percent \| Consumer real estate \| Revolving Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans	54		54		51
Greater than 100 percent \| Consumer real estate \| Revolving Loans Converted to Term Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving Loans Converted to Term Loans	$ 8		$ 8		$ 9