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Stock-based compensation - Shares available for future grants and reserve for issuance (Details)
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved for issuance (in shares) 160,692,694us-gaap_CommonStockCapitalSharesReservedForFutureIssuance [1]  
Shares to be issued upon exercise of outstanding options and RSUs (75,461,686)txn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedUpopnExerciseOfOutstandingOptionsAndRestrictedStockUnits [1]  
Available for future grants 85,231,008txn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForFutureGrant  
Long-term incentive and director compensation plans    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved for issuance (in shares) 121,127,656us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= txn_LongTermIncentiveAndDirectorCompensationPlansMember		 [1]  
Shares to be issued upon exercise of outstanding options and RSUs (75,086,983)txn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedUpopnExerciseOfOutstandingOptionsAndRestrictedStockUnits
/ us-gaap_PlanNameAxis
= txn_LongTermIncentiveAndDirectorCompensationPlansMember		 [1]  
Available for future grants 46,040,673txn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForFutureGrant
/ us-gaap_PlanNameAxis
= txn_LongTermIncentiveAndDirectorCompensationPlansMember		  
TI employees 2005 stock purchase plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved for issuance (in shares) 39,565,038us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= txn_A2005EmployeeStockPurchasePlanMember		 [1]  
Shares to be issued upon exercise of outstanding options and RSUs (374,703)txn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesToBeIssuedUpopnExerciseOfOutstandingOptionsAndRestrictedStockUnits
/ us-gaap_PlanNameAxis
= txn_A2005EmployeeStockPurchasePlanMember		 [1]  
Available for future grants 39,190,335txn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForFutureGrant
/ us-gaap_PlanNameAxis
= txn_A2005EmployeeStockPurchasePlanMember		  
Director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Directors deferred compensation account (in shares) 135,722us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		 129,264us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
[1] Includes 135,722 shares credited to directors’ deferred stock accounts that settle in shares of TI common stock. These shares are not included as grants outstanding at December 31, 2014.