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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
A reconciliation of the provision (benefit) for income taxes      
Statutory U.S. Federal tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Increase (decrease) in provision for income taxes due to:      
Tax provision on pretax earnings (loss) from continuing operations at statutory U.S. Federal tax rate $ 76us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 117us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 115us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Differences in income taxes on foreign earnings, losses and remittances (18)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (29)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Changes in valuation allowance 37us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 37us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (7)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax audits and settlements 2us-gaap_IncomeTaxReconciliationTaxSettlements 1us-gaap_IncomeTaxReconciliationTaxSettlements (1)us-gaap_IncomeTaxReconciliationTaxSettlements
Other items (5)us-gaap_IncomeTaxReconciliationOtherAdjustments (6)us-gaap_IncomeTaxReconciliationOtherAdjustments 6us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes $ 92us-gaap_IncomeTaxExpenseBenefit $ 120us-gaap_IncomeTaxExpenseBenefit $ 108us-gaap_IncomeTaxExpenseBenefit