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Pension and Postretirement Benefit Plans (Components of net periodic benefit cost and other information) (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
United States Qualified and Non-qualified Pension Benefits    
Net periodic benefit cost (benefit)    
Service cost $ 73us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
$ 60us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Interest cost 164us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
169us-gaap_DefinedBenefitPlanInterestCost
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= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Expected return on plan assets (267)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
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= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
(261)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
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Amortization of transition (asset) obligation 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
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0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
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Amortization of prior service cost (benefit) (6)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
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1us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
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Amortization of net actuarial (gain) loss 102us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
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= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
61us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
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Net periodic benefit cost (benefit) 66mmm_DefinedBenefitPlanNetPeriodicCostBeforeSettlementsCurtailmentsSpecialTerminationBenefitsAndOther
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
30mmm_DefinedBenefitPlanNetPeriodicCostBeforeSettlementsCurtailmentsSpecialTerminationBenefitsAndOther
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= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Settlements, curtailments, special termination benefits and other 0us-gaap_DefinedBenefitPlanOtherCosts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
0us-gaap_DefinedBenefitPlanOtherCosts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other 66us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
30us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
International Qualified and Non-qualified Pension Benefits    
Net periodic benefit cost (benefit)    
Service cost 42us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
36us-gaap_DefinedBenefitPlanServiceCost
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
Interest cost 55us-gaap_DefinedBenefitPlanInterestCost
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
64us-gaap_DefinedBenefitPlanInterestCost
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
Expected return on plan assets (81)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
(79)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Amortization of transition (asset) obligation 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
Amortization of prior service cost (benefit) (4)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
(4)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Amortization of net actuarial (gain) loss 38us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
31us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
Net periodic benefit cost (benefit) 50mmm_DefinedBenefitPlanNetPeriodicCostBeforeSettlementsCurtailmentsSpecialTerminationBenefitsAndOther
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
48mmm_DefinedBenefitPlanNetPeriodicCostBeforeSettlementsCurtailmentsSpecialTerminationBenefitsAndOther
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Settlements, curtailments, special termination benefits and other (17)us-gaap_DefinedBenefitPlanOtherCosts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
0us-gaap_DefinedBenefitPlanOtherCosts
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other 33us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
48us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Postretirement Benefits    
Net periodic benefit cost (benefit)    
Service cost 21us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
16us-gaap_DefinedBenefitPlanServiceCost
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Interest cost 25us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
24us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Expected return on plan assets (22)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
(22)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Amortization of transition (asset) obligation 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
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Amortization of prior service cost (benefit) (8)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
(12)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
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Amortization of net actuarial (gain) loss 19us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
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14us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Net periodic benefit cost (benefit) 35mmm_DefinedBenefitPlanNetPeriodicCostBeforeSettlementsCurtailmentsSpecialTerminationBenefitsAndOther
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
20mmm_DefinedBenefitPlanNetPeriodicCostBeforeSettlementsCurtailmentsSpecialTerminationBenefitsAndOther
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Settlements, curtailments, special termination benefits and other 0us-gaap_DefinedBenefitPlanOtherCosts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
0us-gaap_DefinedBenefitPlanOtherCosts
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= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Net periodic benefit cost (benefit) after settlements, curtailments, special termination benefits and other $ 35us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
$ 20us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember