2.0.0.10falseSummary of Significant Accounting Policies109 - Disclosure - Summary of Significant Accounting Policiestruefalsefalsefalse1usd$falsefalseiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares053us-gaap_SignificantAccountingPoliciesTextBlockus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalsefalse00<div>
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<p style="MARGIN-TOP: 12px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>Note 1.    Summary of
Significant Accounting Policies</b></font></p>
<p style="MARGIN-TOP: 6px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">The accounting
and financial reporting policies of State Street Corporation
conform to accounting principles generally accepted in the United
States of America, referred to as 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, State Street
Bank and Trust Company, is referred to as State Street Bank. We
have two lines of business:</font></p>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 6px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%">
<tr>
<td width="5%"><font size="1"> </font></td>
<td valign="top" width="2%" align="left"><font style="FONT-FAMILY: Times New Roman" size="2">•</font></td>
<td valign="top" width="1%"><font size="1"> </font></td>
<td valign="top" align="left">
<p align="left"><font style="FONT-FAMILY: Times New Roman" size="2">Investment Servicing provides services for U.S. mutual funds,
collective investment funds and other investment pools, corporate
and public retirement plans, insurance companies, foundations and
endowments worldwide. Products include custody, product- and
participant-level accounting; daily pricing and administration;
master trust and master custody; recordkeeping; foreign exchange,
brokerage and other trading services; securities finance; deposit
and short-term investment facilities; loans and lease financing;
investment manager and alternative investment manager operations
outsourcing; and performance, risk and compliance analytics to
support institutional investors.</font></p>
</td>
</tr>
</table>
<p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 6px">
 </p>
<table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%">
<tr>
<td width="5%"><font size="1"> </font></td>
<td valign="top" width="2%" align="left"><font style="FONT-FAMILY: Times New Roman" size="2">•</font></td>
<td valign="top" width="1%"><font size="1"> </font></td>
<td valign="top" align="left">
<p align="left"><font style="FONT-FAMILY: Times New Roman" size="2">Investment Management offers a broad array of services for
managing financial assets, including investment management and
investment research services, primarily for institutional investors
worldwide. These services include passive and active U.S. and
non-U.S. equity and fixed-income strategies, and other related
services, such as securities finance.</font></p>
</td>
</tr>
</table>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">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. 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.</font></p>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">The preparation
of consolidated financial statements requires
management to make estimates and assumptions that affect
the amounts reported in the accompanying consolidated financial
statements and these condensed notes. Actual results could differ
from those estimates. Consolidated results of operations for the
three months ended March 31, 2010 are not necessarily
indicative of the results that may be expected for any future
three-month period or for the year ending December 31, 2010.
Certain previously reported amounts have been reclassified to
conform to current period classifications as presented in this
Form 10-Q.</font></p>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">The
consolidated statement of condition at December 31, 2009 has
been derived from the audited financial statements at that date,
but does not include all footnotes required by GAAP for a complete
set of financial statements. The accompanying consolidated
financial statements and these condensed notes should be read in
conjunction with the financial and risk factors information
included in our 2009 Form 10-K, which we previously filed with
the SEC.</font></p>
<p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b><i>New Accounting
Pronouncements</i></b></font></p>
<p style="MARGIN-TOP: 6px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">In February
2010, the FASB issued an amendment to GAAP related to fair value
measurement disclosures. The amendment requires new disclosures for
significant transfers of financial assets and liabilities in and
out of level 1 and level 2 of the prescribed valuation hierarchy,
as well as information about purchases, sales, issuances and
settlements for financial assets and liabilities categorized in
level 3 of the valuation hierarchy. The amendment also provided
several clarifications with respect to the level of disaggregation
and disclosures about valuation techniques and inputs. The
requirement to disclose information about purchases, sales,
issuances and settlements for financial assets and liabilities
categorized in level 3 of the valuation hierarchy was deferred,
with respect to State Street, to January 1, 2011. The
disclosures required by the amendment are provided in note
9.</font></p>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">In June 2009,
the FASB issued a new accounting standard related to accounting for
variable interest entities, or VIEs. This new standard amended
existing GAAP, eliminated the exception for qualifying special
purpose entities, or QSPEs, and modified the characteristics that
identify a VIE. The new standard also provided new criteria for
determining whether an entity is the primary beneficiary of a VIE,
and increased the frequency of required assessments to determine
whether an entity is the primary beneficiary.</font></p>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">The new
standard was adopted by State Street on January 1, 2010.
However, the FASB deferred the application of the new
standard’s provisions for certain investment funds by asset
managers that have the attributes of an investment company (with no
obligation to fund potentially significant losses of an investment
fund), which permits the continued application of the previous
accounting. State Street’s adoption of the new standard
excluded certain investment funds which, absent the deferral, may
have been consolidated.</font></p>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">As a result of
adoption, we consolidated certain asset-backed securitization
trusts in which we have investments significant to the trusts and
corresponding unilateral servicer removal rights. The adoption did
not have a material effect on our consolidated results of
operations or financial condition. Information about the effect of
adoption and other information about these trusts is provided in
note 7.</font></p>
<p style="MARGIN-TOP: 12px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px">
<font style="FONT-FAMILY: Times New Roman" size="2">In April 2010,
as a result of a market transaction between each of the trusts and
new trust investors unrelated to us, we no longer have unilateral
servicer removal rights. Although we continue to maintain
investments significant to each trust with certain corresponding
removal rights, we are no longer deemed to be the primary
beneficiary of each of the trusts. As a result, beginning on
April 23, 2010, we no longer record the assets and liabilities
of the trusts in our consolidated financial statements. We will
continue to carry our direct investments in the trusts. This
de-consolidation is not expected to have a material effect on our
consolidated results of operations or financial
condition.</font></p>
</div>Note 1.    Summary of
Significant Accounting Policies
The accounting
and financial reporting policies of State StreetfalsefalsefalseThis element may be used to describe all significant accounting policies of the reporting entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 22
-Paragraph 8
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