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Postretirement Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Defined contribution plans    
Costs related to defined contribution plans $ 101us-gaap_DefinedContributionPlanCostRecognized $ 101us-gaap_DefinedContributionPlanCostRecognized
U.S. Plans    
Defined contribution plans    
Costs related to defined contribution plans 83us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember		 81us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Non-U.S. Plans    
Defined contribution plans    
Costs related to defined contribution plans $ 18us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember		 $ 20us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanTypeAxis
= us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember