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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 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 | ​ | ​ | (7) | ​ | ​ | (8) | ​ | ​ | (59) | ​ | ​ | (6) | ​ | ​ | (80) | ​
Balance as of June 30, 2021 | ​ | $ | 4,680 | ​ | $ | 1,850 | ​ | $ | 6,933 | ​ | $ | 259 | ​ | $ | 13,722 | ​
Acquired Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |
(Millions) |  | 2021 |  | 2020 |
Customer related intangible assets | ​ | $ | 4,276 | ​ | $ | 4,280 | ​
Patents | ​ |  | 518 | ​ |  | 537 | ​
Other technology-based intangible assets | ​ |  | 2,115 | ​ |  | 2,114 | ​
Definite-lived tradenames | ​ |  | 1,173 | ​ |  | 1,178 | ​
Other amortizable intangible assets | ​ |  | 107 | ​ |  | 104 | ​
Total gross carrying amount | ​ | $ | 8,189 | ​ | $ | 8,213 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Accumulated amortization — customer related | ​ |  | (1,539) | ​ |  | (1,422) | ​
Accumulated amortization — patents | ​ |  | (500) | ​ |  | (512) | ​
Accumulated amortization — other technology-based | ​ |  | (739) | ​ |  | (638) | ​
Accumulated amortization — definite-lived tradenames | ​ |  | (414) | ​ |  | (385) | ​
Accumulated amortization — other | ​ |  | (81) | ​ |  | (79) | ​
Total accumulated amortization | ​ | $ | (3,273) | ​ | $ | (3,036) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total finite-lived intangible assets — net | ​ | $ | 4,916 | ​ | $ | 5,177 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-amortizable intangible assets (primarily tradenames) | ​ |  | 656 | ​ |  | 658 | ​
Total intangible assets — net | ​ | $ | 5,572 | ​ | $ | 5,835 | ​
Schedule of amortization expense for acquired intangible assets | Amortization expense for the three and six months ended June 30, 2021 and 2020 follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three months ended |  | Six months ended |
​ | ​ | June 30, | ​ | June 30, | ​
(Millions) |  | 2021 |  | 2020 |  | 2021 | ​ | 2020 |
Amortization expense | ​ | $ | 134 | ​ | $ | 134 | ​ | $ | 267 | ​ | $ | 268 | ​
Schedule of expected amortization expense for acquired amortizable intangible assets | Expected amortization expense for acquired amortizable intangible assets recorded as of June 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Remainder of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | After |
(Millions) | ​ | 2021 | ​ | 2022 | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2026 | ​ | 2026 |
Amortization expense | ​ | $ | 262 | ​ | $ | 516 | ​ | $ | 487 | ​ | $ | 459 | ​ | $ | 429 | ​ | $ | 421 | ​ | $ | 2,342 | ​

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