Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=txn_FixedIncomeSecuritiesAndCashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Postretirement Benefit Plans - Weighted Average Allocations (Details)	Dec. 31, 2020	Dec. 31, 2019
Fixed income securities and cash equivalents \| U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation (in percent)	70.00%	65.00%
Fixed income securities and cash equivalents \| U.S. \| Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation (in percent)	65.00%	65.00%
Fixed income securities and cash equivalents \| Non-U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation (in percent)	76.00%	73.00%
Fixed income securities and cash equivalents \| Minimum \| U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	65.00%
Fixed income securities and cash equivalents \| Minimum \| U.S. \| Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	65.00%
Fixed income securities and cash equivalents \| Minimum \| Non-U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	60.00%
Fixed income securities and cash equivalents \| Maximum \| U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	80.00%
Fixed income securities and cash equivalents \| Maximum \| U.S. \| Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	80.00%
Fixed income securities and cash equivalents \| Maximum \| Non-U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	100.00%
Equity securities \| U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation (in percent)	30.00%	35.00%
Equity securities \| U.S. \| Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation (in percent)	35.00%	35.00%
Equity securities \| Non-U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation (in percent)	24.00%	27.00%
Equity securities \| Minimum \| U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	20.00%
Equity securities \| Minimum \| U.S. \| Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	20.00%
Equity securities \| Minimum \| Non-U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	0.00%
Equity securities \| Maximum \| U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	35.00%
Equity securities \| Maximum \| U.S. \| Retiree health care plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	35.00%
Equity securities \| Maximum \| Non-U.S. \| Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Targeted allocation (in percent)	40.00%