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Stock-Based Compensation (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Amounts recognized in the financial statements    
Stock-based compensation programs expense $ 138us-gaap_AllocatedShareBasedCompensationExpense $ 122us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefits (47)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (40)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expenses, net of tax 91us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 82us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cost of Sales    
Amounts recognized in the financial statements    
Stock-based compensation programs expense 23us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 22us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Selling, general and administrative expenses    
Amounts recognized in the financial statements    
Stock-based compensation programs expense 88us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 77us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Research, development and related expenses    
Amounts recognized in the financial statements    
Stock-based compensation programs expense $ 27us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mmm_ResearchDevelopmentAndRelatedExpensesMember		 $ 23us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= mmm_ResearchDevelopmentAndRelatedExpensesMember