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Benefit Plans (Net Postemployment Costs) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Postemployment Benefits [Abstract]      
Service cost $ 38pm_PostemploymentPlanServiceCost $ 34pm_PostemploymentPlanServiceCost $ 30pm_PostemploymentPlanServiceCost
Interest cost 26pm_PostemploymentPlanInterestCost 20pm_PostemploymentPlanInterestCost 22pm_PostemploymentPlanInterestCost
Amortization of net loss 66pm_PostemploymentPlanAmortizationOfGainsLosses 60pm_PostemploymentPlanAmortizationOfGainsLosses 53pm_PostemploymentPlanAmortizationOfGainsLosses
Other expense 421pm_PostemploymentPlanOtherCost 84pm_PostemploymentPlanOtherCost 75pm_PostemploymentPlanOtherCost
Net postemployment costs $ 551us-gaap_PostemploymentBenefitsPeriodExpense $ 198us-gaap_PostemploymentBenefitsPeriodExpense $ 180us-gaap_PostemploymentBenefitsPeriodExpense