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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets |
Goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions) | ​ | Safety and Industrial | ​ | Transportation and Electronics | ​ | Health Care | ​ | Consumer | ​ | Total Company | ​
Balance as of December 31, 2020 | ​ | $ | 4,687 | ​ | $ | 1,858 | ​ | $ | 6,992 | ​ | $ | 265 | ​ | $ | 13,802 | ​
Translation and other | ​ | ​ | (29) | ​ | ​ | (14) | ​ | ​ | (98) | ​ | ​ | (7) | ​ | ​ | (148) | ​
Balance as of March 31, 2021 | ​ | $ | 4,658 | ​ | $ | 1,844 | ​ | $ | 6,894 | ​ | $ | 258 | ​ | $ | 13,654 | ​
Acquired Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | December 31, |
(Millions) |  | 2021 |  | 2020 |
Customer related intangible assets | ​ | $ | 4,266 | ​ | $ | 4,280 | ​
Patents | ​ |  | 517 | ​ |  | 537 | ​
Other technology-based intangible assets | ​ |  | 2,113 | ​ |  | 2,114 | ​
Definite-lived tradenames | ​ |  | 1,172 | ​ |  | 1,178 | ​
Other amortizable intangible assets | ​ |  | 104 | ​ |  | 104 | ​
Total gross carrying amount | ​ | $ | 8,172 | ​ | $ | 8,213 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated amortization — customer related | ​ |  | (1,473) | ​ |  | (1,422) | ​
Accumulated amortization — patents | ​ |  | (495) | ​ |  | (512) | ​
Accumulated amortization — other technology-based | ​ |  | (687) | ​ |  | (638) | ​
Accumulated amortization — definite-lived tradenames | ​ |  | (397) | ​ |  | (385) | ​
Accumulated amortization — other | ​ |  | (78) | ​ |  | (79) | ​
Total accumulated amortization | ​ | $ | (3,130) | ​ | $ | (3,036) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total finite-lived intangible assets — net | ​ | $ | 5,042 | ​ | $ | 5,177 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-amortizable intangible assets (primarily tradenames) | ​ |  | 655 | ​ |  | 658 | ​
Total intangible assets — net | ​ | $ | 5,697 | ​ | $ | 5,835 | ​
Schedule of amortization expense for acquired intangible assets | Amortization expense for the three months ended March 31, 2021 and 2020 follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended
​ | ​ | March 31,
(Millions) |  | 2021 |  | 2020
Amortization expense | ​ | $ | 133 | ​ | $ | 134
Schedule of expected amortization expense for acquired amortizable intangible assets | Expected amortization expense for acquired amortizable intangible assets recorded as of March 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Remainder of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | After |
(Millions) | ​ | 2021 | ​ | 2022 | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2026 | ​ | 2026 |
Amortization expense | ​ | $ | 395 | ​ | $ | 514 | ​ | $ | 488 | ​ | $ | 458 | ​ | $ | 428 | ​ | $ | 421 | ​ | $ | 2,338 | ​

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