2.2.0.25falsefalse40702 - Disclosure - Note 7. Short-term Borrowings and Long-term Debt (Information on Short-term Borrowings and Interest Rates) (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDfalsefalse2/1/2010 - 1/31/2011
USD ($)
USD ($) / shares
$Duration_2_1_2010_To_1_31_2011http://www.sec.gov/CIK0000104169duration2010-02-01T00:00:002011-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse2/1/2009 - 1/31/2010
USD ($)
USD ($) / shares
$Duration_2_1_2009_To_1_31_2010http://www.sec.gov/CIK0000104169duration2009-02-01T00:00:002010-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse2/1/2008 - 1/31/2009
USD ($)
USD ($) / shares
$Duration_2_1_2008_To_1_31_2009http://www.sec.gov/CIK0000104169duration2008-02-01T00:00:002009-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit15Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit16Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_DebtInstrumentsAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse3false0us-gaap_ShorttermDebtMaximumMonthendOutstandingAmountus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse92820000009282falsetruefalsefalsefalse2truefalsefalse45360000004536falsetruefalsefalsefalse3truefalsefalse78660000007866falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Industry Guide
-Number 3
-Section VII
-Subsection 2
falsefalse4false0us-gaap_ShorttermDebtAverageOutstandingAmountus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse40200000004020falsetruefalsefalsefalse2truefalsefalse15960000001596falsetruefalsefalsefalse3truefalsefalse45200000004520falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.No authoritative reference available.falsefalse5false0us-gaap_ShortTermDebtWeightedAverageInterestRateus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.0020.002falsefalsefalsefalsefalse2truetruefalse0.0050.005falsefalsefalsefalsefalse3truetruefalse0.0210.021falsefalsefalsefalsefalseOtherus-types:percentItemTypepureReflects the calculation as of the balance-sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19
-Subparagraph b
-Article 5
falsefalse34Note 7. Short-term Borrowings and Long-term Debt (Information on Short-term Borrowings and Interest Rates) (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruetrue
