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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Undistributed earnings of foreign subsidiaries deemed permanently reinvested  
U.S. federal income tax statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
U.S. federal  
Undistributed earnings of foreign subsidiaries deemed permanently reinvested  
Undistributed earnings of foreign subsidiaries deemed permanently reinvested 103us-gaap_UndistributedEarningsOfForeignSubsidiaries
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
Venezuela  
Undistributed earnings of foreign subsidiaries deemed permanently reinvested  
Undistributed earnings of foreign subsidiaries deemed permanently reinvested 558us-gaap_UndistributedEarningsOfForeignSubsidiaries
/ us-gaap_IncomeTaxAuthorityAxis
= country_VE