Note 3. Goodwill and Intangible Assets Goodwill The changes in the carrying amount of goodwill by segment are as follows: | | | | | | | | | | | | Textron | | | Textron | | | | | (In millions) | Aviation | Bell | Systems | Industrial | Total | Balance at December 30, 2017 | $ | 614 | $ | 31 | $ | 1,087 | $ | 632 | $ | 2,364 | Disposition | | — | | — | | — | | (153) | | (153) | Acquisition | | — | | — | | 13 | | — | | 13 | Foreign currency translation | | — | | — | | — | | (6) | | (6) | Balance at December 29, 2018 | | 614 | | 31 | | 1,100 | | 473 | | 2,218 | Disposition* | | — | | — | | (71) | | — | | (71) | Acquisition | | — | | — | | 4 | | — | | 4 | Foreign currency translation | | — | | — | | — | | (1) | | (1) | Balance at January 4, 2020 | $ | 614 | $ | 31 | $ | 1,033 | $ | 472 | $ | 2,150 |
*See Note 7 for additional information. Intangible Assets Our intangible assets are summarized below: | | | | | | | | | | | | | | | | January 4, 2020 | December 29, 2018 | | Weighted-Average | Gross | | | | | Gross | | | | | | Amortization | Carrying | Accumulated | | | Carrying | Accumulated | | | (Dollars in millions) | Period (in years) | Amount | Amortization | Net | Amount | Amortization | Net | Patents and technology | 14 | $ | 501 | $ | (242) | $ | 259 | $ | 514 | $ | (211) | $ | 303 | Trade names and trademarks | 14 | | 223 | | (8) | | 215 | | 224 | | (7) | | 217 | Customer relationships and contractual agreements | 15 | | 413 | | (298) | | 115 | | 413 | | (275) | | 138 | Other | 4 | | 6 | | (6) | | — | | 6 | | (6) | | — | Total | | $ | 1,143 | $ | (554) | $ | 589 | $ | 1,157 | $ | (499) | $ | 658 |
Trade names and trademarks in the table above include $208 million of indefinite-lived intangible assets at both January 4, 2020 and December 29, 2018. Amortization expense totaled $59 million, $66 million and $69 million in 2019, 2018 and 2017, respectively. Amortization expense is estimated to be approximately $55 million, $53 million, $54 million, $37 million and $32 million in 2020, 2021, 2022, 2023 and 2024, respectively.
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