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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets |
Goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Millions) | ​ | Safety and Industrial | ​ | Transportation and Electronics | ​ | Health Care | ​ | Consumer | ​ | Total Company | ​
Balance as of December 31, 2019 | ​ | $ | 4,621 | ​ | $ | 1,830 | ​ | $ | 6,739 | ​ | $ | 254 | ​ | $ | 13,444 | ​
Acquisition activity | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (18) | ​ | ​ | — | ​ | ​ | (18) | ​
Divestiture activity | ​ | ​ | — | ​ | ​ | (10) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (10) | ​
Translation and other | ​ | ​ | (64) | ​ | ​ | (10) | ​ | ​ | (29) | ​ | ​ | (1) | ​ | ​ | (104) | ​
Balance as of March 31, 2020 | ​ | $ | 4,557 | ​ | $ | 1,810 | ​ | $ | 6,692 | ​ | $ | 253 | ​ | $ | 13,312 | ​
Acquired Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | December 31, |
(Millions) |  | 2020 |  | 2019 |
Customer related intangible assets | ​ | $ | 4,222 | ​ | $ | 4,316 | ​
Patents | ​ |  | 535 | ​ |  | 538 | ​
Other technology-based intangible assets | ​ |  | 2,093 | ​ |  | 2,124 | ​
Definite-lived tradenames | ​ |  | 1,175 | ​ |  | 1,158 | ​
Other amortizable intangible assets | ​ |  | 123 | ​ |  | 125 | ​
Total gross carrying amount | ​ | $ | 8,148 | ​ | $ | 8,261 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated amortization — customer related | ​ |  | (1,197) | ​ |  | (1,180) | ​
Accumulated amortization — patents | ​ |  | (500) | ​ |  | (499) | ​
Accumulated amortization — other technology-based | ​ |  | (470) | ​ |  | (435) | ​
Accumulated amortization — definite-lived tradenames | ​ |  | (332) | ​ |  | (316) | ​
Accumulated amortization — other | ​ |  | (90) | ​ |  | (90) | ​
Total accumulated amortization | ​ | $ | (2,589) | ​ | $ | (2,520) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total finite-lived intangible assets — net | ​ | $ | 5,559 | ​ | $ | 5,741 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-amortizable intangible assets (primarily tradenames) | ​ |  | 632 | ​ |  | 638 | ​
Total intangible assets — net | ​ | $ | 6,191 | ​ | $ | 6,379 | ​
Schedule of amortization expense for acquired intangible assets | Amortization expense for the three months ended March 31, 2020 and 2019 follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended
​ | ​ | March 31,
(Millions) |  | 2020 |  | 2019
Amortization expense | ​ | $ | 134 | ​ | $ | 69
Schedule of expected amortization expense for acquired amortizable intangible assets | Expected amortization expense for acquired amortizable intangible assets recorded as of March 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Remainder of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | After |
(Millions) | ​ | 2020 | ​ | 2021 | ​ | 2022 | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2025 |
Amortization expense | ​ | $ | 398 | ​ | $ | 521 | ​ | $ | 509 | ​ | $ | 479 | ​ | $ | 454 | ​ | $ | 424 | ​ | $ | 2,774 | ​

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