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Income taxes - Reconciliation items from income tax computed at statutory federal rate (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Computed tax at statutory rate $ 1,356us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 964us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 677us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Non-U.S. effective tax rates (212)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (156)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (345)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
U.S. R&D tax credit (59)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (129)us-gaap_IncomeTaxReconciliationTaxCreditsResearch 0us-gaap_IncomeTaxReconciliationTaxCreditsResearch
U.S. tax benefit for manufacturing (51)txn_IncomeTaxReconciliationTaxCreditsManufacturingAndForeignSales (66)txn_IncomeTaxReconciliationTaxCreditsManufacturingAndForeignSales (158)txn_IncomeTaxReconciliationTaxCreditsManufacturingAndForeignSales
Impact of changes to uncertain tax positions 3us-gaap_IncomeTaxReconciliationTaxContingencies (14)us-gaap_IncomeTaxReconciliationTaxContingencies (88)us-gaap_IncomeTaxReconciliationTaxContingencies
Non-deductible expenses 6us-gaap_IncomeTaxReconciliationNondeductibleExpense 13us-gaap_IncomeTaxReconciliationNondeductibleExpense 42us-gaap_IncomeTaxReconciliationNondeductibleExpense
Other 10us-gaap_IncomeTaxReconciliationOtherAdjustments (20)us-gaap_IncomeTaxReconciliationOtherAdjustments 48us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes $ 1,053us-gaap_IncomeTaxExpenseBenefit $ 592us-gaap_IncomeTaxExpenseBenefit $ 176us-gaap_IncomeTaxExpenseBenefit