Summary of Significant Accounting Policies

Basis of Presentation

The accounting and financial reporting policies of State Street Corporation conform to U.S. GAAP. State Street Corporation, the Parent Company, is a financial holding company headquartered in Boston, Massachusetts. Unless otherwise indicated or unless the context requires otherwise, all references in these notes to consolidated financial statements to “State Street,” “we,” “us,” “our” or similar references mean State Street Corporation and its subsidiaries on a consolidated basis. Our principal banking subsidiary is State Street Bank.

The accompanying Consolidated Financial Statements should be read in conjunction with the financial and risk factor information included in our 2017 Form 10-K, which we previously filed with the SEC.

The consolidated financial statements accompanying these condensed notes are unaudited. In the opinion of management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair statement of the consolidated results of operations in these financial statements, have been made. Certain previously reported amounts presented in this Form 10-Q have been reclassified to conform to current-period presentation. Events occurring subsequent to the date of our consolidated statement of condition were evaluated for potential recognition or disclosure in our consolidated financial statements through the date we filed this Form 10-Q with the SEC.

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions in the application of certain of our significant accounting policies that may materially affect the reported amounts of assets, liabilities, equity, revenue and expenses. As a result of unanticipated events or circumstances, actual results could differ from those estimates. These accounting estimates reflect the best judgment of management, but actual results could differ.

Our consolidated statement of condition as of December 31, 2017 included in the accompanying consolidated financial statements was derived from the audited financial statements as of that date, but does not include all notes required by U.S. GAAP for a complete set of consolidated financial statements.

Recent Accounting Developments



Relevant standards that were issued but not yet adopted

Standard	Description	Date of Adoption	Effects on the financial statements or other significant matters
ASU 2016-02, Leases (Topic 842)	The standard represents a wholesale change to lease accounting and requires all leases, other than short-term leases, to be reported on balance sheet through recognition of a right-of-use asset and a corresponding liability for future lease obligations. The standard also requires extensive disclosures for assets, expenses, and cash flows associated with leases, as well as a maturity analysis of lease liabilities.	January 1, 2019	We are currently assessing the impact of the standard on our consolidated financial statements, but we anticipate an increase in assets and liabilities due to the recognition of the required right-of-use asset and corresponding liability for all lease obligations that are currently classified as operating leases, primarily real estate leases for office space, as well as additional disclosure on all our lease obligations.
ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The standard replaces the existing incurred loss impairment guidance and requires immediate recognition of expected credit losses for financial assets carried at amortized cost, including trade and other receivables, loans and commitments, held-to-maturity debt securities and other financial assets, held at the reporting date to be measured based on historical experience, current conditions and reasonable supportable forecasts. The standard also amends existing impairment guidance for available-for-sale securities, and credit losses will be recorded as an allowance versus a write-down of the amortized cost basis of the security and will allow for a reversal of impairment loss when the credit of the issuer improves. The guidance requires a cumulative effect of initial application to be recognized in retained earnings at the date of initial application.	January 1, 2020, early adoption permitted	We are currently assessing the impact of the standard on our consolidated financial statements, and a significant implementation project is in place to ensure that expected credit losses are calculated in accordance with the standard. We have established a steering committee to provide cross-functional governance over the project plan and key decisions, and are currently developing key accounting policies, assessing existing credit loss models against the new guidance and processes and identifying a complete set of data requirements and sources. We continue to develop and test new and modified credit loss models and based on our analysis to date, we expect the timing of the allowance for credit losses to accelerate under the new standard. We are continuing to assess the extent of the impact on the allowance for credit losses which will be impacted by the Company's portfolio and the macroeconomic factors on the date of adoption.
ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	The standard simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. The ASU requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying value exceeds the fair value of the reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss.	January 1, 2020, early adoption permitted	We are evaluating the impacts of early adoption, and will apply this standard prospectively upon adoption.
ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium amortization on Purchased Callable Debt Securities	The standard shortens the amortization period for certain purchased callable debt securities to the earliest call date.	January 1, 2019, early adoption permitted	We are currently evaluating the impact of the new standard and the early adoption provisions.
ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities	The standard amends the hedge accounting model to better portray the economics of risk management activities in the financial statements and enhances the presentation of hedge results. The amendments also make targeted changes to simplify the application of hedge accounting in certain situations.	January 1, 2019, early adoption permitted	We are currently evaluating the impact of the new standard and the early adoption provisions.
ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	This standard provides an election to reclassify the stranded tax effects resulting from the enactment of the Tax Cuts and Jobs Act of 2017, from accumulated other comprehensive income to retained earnings.	January 1, 2019, early adoption permitted	We are currently evaluating the impact of the new standard and the early adoption provisions.

We adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), on January 1, 2018. The standard provides companies with a single model for recognizing revenue from contracts with customers. The core principle requires a company to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration that it expects to be entitled to in exchange for those goods or services. We used the modified retrospective method of transition, which requires the impact of applying the standard on prior periods to be reflected in opening retained earnings upon adoption. The adoption of the standard does not have a material impact on the timing of recognition of revenue in our consolidated statement of income, or our consolidated statement of position, and therefore no adjustment has been made to retained earnings. However, due to the updated principal and agent guidance in the standard, certain costs we pay to third parties on behalf of our clients previously reported in our consolidated statement of income on a net basis, primarily against the related management fee revenue, and trading services revenue are now reported on a gross basis as expenses.

For the six months ended June 30, 2018, both revenues and expenses increased by approximately $135 million, primarily due to the updated principal and agent guidance. The revenue impact was approximately $90 million in management fees, $35 million in trading services, and $10 million across other revenue line items, and the expense impact was approximately $30 million in transaction processing, $90 million in other expenses, and $15 million in information systems and communication. Adoption of the standard had no impact on cash from or used in operating, financing, or investing activities on our consolidated statements of cash flows.

We adopted ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, effective January 1, 2018. Under the new standard, all equity securities will be measured at fair value through earnings with certain exceptions, including investments accounted for under the equity method of accounting or where the fair market value of an equity security is not readily available. Upon adoption of the standard on January 1, 2018, we reclassified approximately $397 million of money market funds and $46 million of equity securities held at fair value through profit and loss in other assets. The cumulative-effect transition adjustment recognized in retained earnings on January 1, 2018, and the change in fair value recognized through profit and loss for the period ended June 30, 2018, were immaterial to the financial statements.