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Stock-based compensation - Expense (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 277us-gaap_ShareBasedCompensation $ 287us-gaap_ShareBasedCompensation $ 263us-gaap_ShareBasedCompensation
COR      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 48us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 49us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 48us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
R&D      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 62us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 67us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 71us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
SG&A      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 156us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 160us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 127us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Acquisition charges      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 11us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= txn_BusinessCombinationAcquisitionCostsAsRecordedInAcquisitionChargesOrDivestitureGainMember		 $ 11us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= txn_BusinessCombinationAcquisitionCostsAsRecordedInAcquisitionChargesOrDivestitureGainMember		 $ 17us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= txn_BusinessCombinationAcquisitionCostsAsRecordedInAcquisitionChargesOrDivestitureGainMember