Summary of Significant Accounting Policies and New Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Charge-Off and Nonaccrual Policies and Practices by Product

Our charge-off and nonaccrual policies differ by product and are summarized below:

Product	Charge-off Policies and Practices	Nonaccrual Policies and Practices
Commercial Loans Real estate, including construction Business and corporate banking Global banking Other commercial	Commercial loan balances are charged off at the time all or a portion of the balance is deemed uncollectible. For loans secured with collateral, loan balances are generally written down to the estimated fair value of the collateral less costs to sell.	Loans are generally categorized as nonaccruing when contractually delinquent for more than three months or in the opinion of management, reasonable doubt exists with respect to the ultimate collectibility of interest or principal based on certain factors including the period of time past due and adequacy of collateral. When classified as nonaccruing, any accrued interest recorded on the loan is generally deemed uncollectible and reversed against income. Interest income is subsequently recognized only to the extent of cash received until the loan is placed on accrual status. In instances where there is doubt as to collectibility of principal, interest payments received are applied to principal. Loans are not reclassified as accruing until interest and principal payments are current and future payments are reasonably assured.
Residential Mortgage Loans	Carrying amounts in excess of fair value less costs to sell are generally charged off at the time foreclosure is initiated or when settlement is reached with the borrower, but not to exceed the end of the month in which the account becomes six months contractually delinquent. If foreclosure is not pursued and there is no reasonable expectation for recovery, the account is generally charged off no later than the end of the month in which the account becomes six months contractually delinquent.(1)	Loans are generally designated as nonaccruing when contractually delinquent for more than three months. When classified as nonaccruing, any accrued interest on the loan is generally deemed uncollectible and reversed against income. Interest accruals are resumed when the loan either becomes current or becomes less than three months delinquent and six months of consecutive payments have been made.
Credit Cards	Loan balances are generally charged off by the end of the month in which the account becomes six months contractually delinquent.(2)	Interest generally accrues until charge-off.
Other Consumer Loans	Loan balances are generally charged off by the end of the month in which the account becomes four months contractually delinquent.	Interest generally accrues until charge-off.

(1)Values are determined based upon broker price opinions or appraisals which are updated at least every 180 days less estimated costs to sell. During the quarterly period between updates, real estate price trends are reviewed on a geographic basis and additional downward adjustments are recorded as necessary. Fair values of foreclosed properties at the time of acquisition are initially determined based upon broker price opinions. Subsequent to acquisition, a more detailed property valuation is performed, reflecting information obtained from a walk-through of the property in the form of a listing agent broker price opinion as well as an independent broker price opinion or appraisal. A valuation is determined from this information within 90 days and any additional write-downs required are recorded through charge-off at that time. In determining the appropriate amounts to charge-off when a property is acquired in exchange for a loan, we do not consider losses on sales of foreclosed properties resulting from deterioration in value during the period the collateral is held because these losses result from future loss events which cannot be considered in determining the fair value of the collateral at the acquisition date.

(2)Charge-offs involving a bankruptcy for credit card receivables occurs by the end of the month, 60 days after notification or 180 days contractually delinquent, whichever comes first.

New Accounting Pronouncements

The following new accounting pronouncement was adopted during 2023:

Accounting Standards Update	Summary of Guidance	Financial Statement Impact
Troubled Debt Restructurings and Vintage Disclosures Issued March 2022	•Eliminates the accounting guidance for TDR Loans by creditors, while enhancing disclosure requirements for certain loan payment modifications by creditors made to borrowers experiencing financial difficulty. •Requires new disclosure of current-period gross charge-offs by year of origination for loans.	•The new guidance was applied prospectively for new loan modifications beginning January 1, 2023, while the accounting for our remaining population of TDR Loans did not materially change. •See Note 7, "Loans," for the new disclosures required by this standard. •The adoption of this guidance did not have a material impact on our financial position or results of operations.

The following are new accounting pronouncements issued by the Financial Accounting Standards Board which will be adopted in future periods:

Accounting Standards Update	Summary of Guidance	Financial Statement Impact
Improvements to Reportable Segment Disclosures Issued November 2023	•Amends and adds certain disclosure requirements for reportable segments. •In particular, requires disclosure of a) significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within the reported measure of segment profit or loss; b) the title and position of the CODM; and c) an explanation of how the CODM uses the reported measure of segment profit or loss in assessing segment performance and deciding how to allocate resources.	•Effective for annual periods beginning January 1, 2024, and interim periods beginning January 1, 2025, with early adoption permitted. •The new guidance is required to be applied retrospectively. •While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations.
Improvements to Income Tax Disclosures Issued December 2023	•Eliminates, amends and adds certain disclosure requirements for income taxes. •In particular, requires the disaggregation of certain existing disclosures, including a) the effective tax rate reconciliation to be broken out into specific categories; b) income taxes paid and income tax expense to be broken out between federal, state and foreign; and c) income before income tax to be broken out between domestic and foreign.	•Effective for annual periods beginning January 1, 2025, with early adoption permitted. •The new guidance should be applied prospectively, with a retrospective option. •While the adoption of this guidance will result in changes to existing disclosures, it will not have any impact on our financial position or results of operations.