2.2.0.25falsefalse061208 - Disclosure - Pensions and Postretirement Benefits (Details 8)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $Jan-01-2010_Dec-31-2010http://www.sec.gov/CIK0000042542duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $TwelveMonthsEnded_31Dec2009http://www.sec.gov/CIK0000042542duration2009-01-01T00:00:002009-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDEPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$3true0us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringA roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.falsefalseChanges in the FV of the Level 3 investments4false0gr_FairValueAssetsMeasuredOnRecurringBasisgrfalsedebitinstantFair Value Assets Measured On Recurring Basis.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse125900000125.9falsetruefalsefalsefalse2truefalsefalse197000000197.0falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Assets Measured On Recurring Basis.No authoritative reference available.falsefalseFV, Opening Balance5false0gr_FairValueAcquisitionsgrfalsedebitdurationFair Value Acquisitions.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse7020000070.2falsefalsefalsefalsefalse2truefalsefalse83000008.3falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Acquisitions.No authoritative reference available.falsefalseAcquisitions6false0gr_FairValueDispositionsgrfalsecreditdurationFair Value Dispositions.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-7800000-7.8falsefalsefalsefalsefalse2truefalsefalse-14700000-14.7falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Dispositions.No authoritative reference available.falsefalseDispositions7false0gr_FairValueRealizedGainLossgrfalsecreditdurationFair Value Realized Gain Loss.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1000000.1falsefalsefalsefalsefalse2truefalsefalse4000000.4falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Realized Gain Loss.No authoritative reference available.falsefalseRealized Gain (Loss)8false0gr_ChangeInFairValuegrfalsedebitdurationChange in Fair Value.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1330000013.3falsefalsefalsefalsefalse2truefalsefalse-65100000-65.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryChange in Fair Value.No authoritative reference available.falsefalseChange in FV9false0gr_FairValueAssetsMeasuredOnRecurringBasisgrfalsedebitinstantFair Value Assets Measured On Recurring Basis.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse201700000201.7falsetruefalsefalsefalse2truefalsefalse125900000125.9falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFair Value Assets Measured On Recurring Basis.No authoritative reference available.falsefalseFV, Ending Balance27Pensions and Postretirement Benefits (Details 8) (USD $)HundredThousandsUnKnownUnKnownUnKnownfalsetrue