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Credit Quality And Allowance For Credit Losses (Loan Modifications Made to Borrowers Experiencing Financial Difficulty) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 287	$ 162
Percent of Total	0.57%	0.31%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 245	$ 118
Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3	20
Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5	11
Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	34	13
Business loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 272	$ 159
Percent of Total	0.59%	0.33%
Business loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 240	$ 117
Business loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	20
Business loans | Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	10
Business loans | Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	32	12
Business loans | International | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1
Business loans | International | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Business loans | International | Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Business loans | International | Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4
Business loans | Commercial borrower
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 10
Percent of Total		0.19%
Business loans | Commercial borrower | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 10
Business loans | Commercial borrower | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans | Commercial borrower | Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans | Commercial borrower | Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 227	$ 124
Percent of Total	0.86%	0.46%
Business loans | Commercial borrower | Domestic loans | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 40	$ 25
Percent of Total	0.27%	0.18%
Business loans | Commercial borrower | Domestic loans | Commercial mortgage | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 40	$ 25
Percent of Total	0.47%	0.28%
Business loans | Commercial borrower | Domestic loans | Real estate construction | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 10
Percent of Total		1.92%
Business loans | Commercial borrower | Domestic loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 199	$ 92
Business loans | Commercial borrower | Domestic loans | Term Extension | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	40	15
Business loans | Commercial borrower | Domestic loans | Term Extension | Commercial mortgage | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	40	15
Business loans | Commercial borrower | Domestic loans | Term Extension | Real estate construction | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		10
Business loans | Commercial borrower | Domestic loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	20
Business loans | Commercial borrower | Domestic loans | Payment delay | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans | Commercial borrower | Domestic loans | Payment delay | Commercial mortgage | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans | Commercial borrower | Domestic loans | Payment delay | Real estate construction | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans | Commercial borrower | Domestic loans | Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	10
Business loans | Commercial borrower | Domestic loans | Interest Rate Reductions | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans | Commercial borrower | Domestic loans | Interest Rate Reductions | Commercial mortgage | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans | Commercial borrower | Domestic loans | Interest Rate Reductions | Real estate construction | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans | Commercial borrower | Domestic loans | Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	28	2
Business loans | Commercial borrower | Domestic loans | Combinations | Commercial mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	10
Business loans | Commercial borrower | Domestic loans | Combinations | Commercial mortgage | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	10
Business loans | Commercial borrower | Domestic loans | Combinations | Real estate construction | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans | Commercial borrower | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 5
Percent of Total	0.54%
Retail loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 15	$ 3
Percent of Total	0.37%	0.07%
Retail loans | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 5
Percent of Total	0.26%
Retail loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 5	$ 1
Retail loans | Term Extension | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5
Retail loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3	0
Retail loans | Payment delay | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Retail loans | Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5	1
Retail loans | Interest Rate Reductions | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Retail loans | Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	1
Retail loans | Combinations | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Retail loans | Consumer borrower
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 10	$ 3
Percent of Total	0.46%	0.13%
Retail loans | Consumer borrower | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 0	$ 1
Retail loans | Consumer borrower | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3	0
Retail loans | Consumer borrower | Interest Rate Reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5	1
Retail loans | Consumer borrower | Combinations
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	1
Retail loans | Consumer borrower | Domestic loans | Home equity | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 10	$ 3
Percent of Total	0.58%	0.16%
Retail loans | Consumer borrower | Domestic loans | Term Extension | Home equity | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 0	$ 1
Retail loans | Consumer borrower | Domestic loans | Payment delay | Home equity | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	3	0
Retail loans | Consumer borrower | Domestic loans | Interest Rate Reductions | Home equity | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5	1
Retail loans | Consumer borrower | Domestic loans | Combinations | Home equity | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 2	$ 1

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

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-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
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