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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Carrying Amount    
Financial Instruments    
Long-term debt, excluding current portion $ 6,459mmm_LongTermDebtExcludingCurrentPortion
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 6,731mmm_LongTermDebtExcludingCurrentPortion
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value    
Financial Instruments    
Long-term debt, excluding current portion $ 6,938mmm_LongTermDebtExcludingCurrentPortion
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 7,203mmm_LongTermDebtExcludingCurrentPortion
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember