| Document and Entity Information | Dec. 02, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | TEXAS INSTRUMENTS INC |
| Entity Incorporation State Country Code | DE |
| Entity Address, State or Province | TX |
| Amendment Flag | false |
| Entity Central Index Key | 0000097476 |
| Document Type | 8-K |
| Document Period End Date | Dec. 2, 2021 |
| Entity File Number | 001-03761 |
| Entity Tax Identification Number | 75-0289970 |
| Entity Address, Address Line One | 12500 TI BOULEVARD |
| Entity Address, City or Town | DALLAS |
| Entity Address, Postal Zip Code | 75243 |
| City Area Code | (214) |
| Local Phone Number | 479-3773 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $1.00 |
| Trading Symbol | TXN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
