2.2.0.25falsefalse40803 - Disclosure - Short-Term Borrowings (Securities Sold Under Repurchase Agreements) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse12/31/2010
USD ($)
USD ($) / shares
$As_Of_12_31_2010http://www.sec.gov/CIK0000093751instant2010-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Divide
http://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse12/31/2009
USD ($)
USD ($) / shares
$As_Of_12_31_2009http://www.sec.gov/CIK0000093751instant2009-12-31T00:00:000001-01-01T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit14Divide
http://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$5false0stt_CollateralizedWithSecuritiesPurchasedUnderResaleAgreementssttfalsedebitinstantCollateralized with securities purchased under resale agreementsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse955000000955falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryCollateralized with securities purchased under resale agreementsNo authoritative reference a
vailable.falsefalse6false0stt_CollateralizedWithInvestmentSecuritiessttfalsedebitinstantCollateralized with investment securitiesfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse66440000006644falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse<
/Cell>Monetaryxbrli:monetaryItemTypemonetaryCollateralized with investment securitiesNo authoritative reference available.falsefalse7false0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse75990000007599falsetruefalsefalsefalse2truefalsefalse1054200000010542falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.Reference 1: http://www.
xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Subparagraph 1
-Article 9
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 140
-Paragraph 100
Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Chapter 4
-Paragraph 36
-IssueDate 2006-05-01
truefalse23Short-Term Borrowings (Securities Sold Under Repurchase Agreements) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
