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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 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 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (5) | ​ | ​ | — | ​ | ​ | (5) | ​
Divestiture activity | ​ | ​ | — | ​ | ​ | (10) | ​ | ​ | (19) | ​ | ​ | — | ​ | ​ | (29) | ​
Translation and other | ​ | ​ | (38) | ​ | ​ | (8) | ​ | ​ | (5) | ​ | ​ | 1 | ​ | ​ | (50) | ​
Balance as of June 30, 2020 | ​ | $ | 4,583 | ​ | $ | 1,812 | ​ | $ | 6,710 | ​ | $ | 255 | ​ | $ | 13,360 | ​
Acquired Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |
(Millions) |  | 2020 |  | 2019 |
Customer related intangible assets | ​ | $ | 4,201 | ​ | $ | 4,316 | ​
Patents | ​ |  | 525 | ​ |  | 538 | ​
Other technology-based intangible assets | ​ |  | 2,093 | ​ |  | 2,124 | ​
Definite-lived tradenames | ​ |  | 1,175 | ​ |  | 1,158 | ​
Other amortizable intangible assets | ​ |  | 120 | ​ |  | 125 | ​
Total gross carrying amount | ​ | $ | 8,114 | ​ | $ | 8,261 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated amortization — customer related | ​ |  | (1,261) | ​ |  | (1,180) | ​
Accumulated amortization — patents | ​ |  | (494) | ​ |  | (499) | ​
Accumulated amortization — other technology-based | ​ |  | (522) | ​ |  | (435) | ​
Accumulated amortization — definite-lived tradenames | ​ |  | (349) | ​ |  | (316) | ​
Accumulated amortization — other | ​ |  | (87) | ​ |  | (90) | ​
Total accumulated amortization | ​ | $ | (2,713) | ​ | $ | (2,520) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total finite-lived intangible assets — net | ​ | $ | 5,401 | ​ | $ | 5,741 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-amortizable intangible assets (primarily tradenames) | ​ |  | 632 | ​ |  | 638 | ​
Total intangible assets — net | ​ | $ | 6,033 | ​ | $ | 6,379 | ​
Schedule of amortization expense for acquired intangible assets | Amortization expense for the three and six months ended June 30, 2020 and 2019 follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended |
​ | ​ | June 30, | ​ | June 30, | ​
(Millions) |  | 2020 |  | 2019 |  | 2020 | ​ | 2019 |
Amortization expense | ​ | $ | 134 | ​ | $ | 70 | ​ | $ | 268 | ​ | $ | 139 | ​
Schedule of expected amortization expense for acquired amortizable intangible assets | Expected amortization expense for acquired amortizable intangible assets recorded as of June 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Remainder of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | After |
(Millions) | ​ | 2020 | ​ | 2021 | ​ | 2022 | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2025 |
Amortization expense | ​ | $ | 265 | ​ | $ | 524 | ​ | $ | 511 | ​ | $ | 481 | ​ | $ | 455 | ​ | $ | 425 | ​ | $ | 2,740 | ​

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