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Schedule of Difference Between Provision For Income Taxes and Federal Statutory Income Tax Rate to Income Before Provision for Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign earnings at different rates (16.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (6.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (8.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Research and other credits 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Net unbenefitted stock compensation 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective Income Tax Rate Reconciliation, Percent 18.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 27.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 28.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Provision for Income Taxes $ 2,797us-gaap_IncomeTaxExpenseBenefit $ 1,151us-gaap_IncomeTaxExpenseBenefit $ 1,038us-gaap_IncomeTaxExpenseBenefit