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Goodwill And Other Intangible Assets (Rollforward Of Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Balance at beginning of year | $ 22,713 | $ 22,581 |
Attributable to acquisitions | 10,402 | 217 | $ 1,276
Attributable to 2020 divestitures | (181) |  |
Adjustments due to finalization of purchase price adjustments | (3) | (7) |
Foreign currency translation and other | 2,489 | (78) |
Balance at end of year | 35,420 | 22,713 | 22,581
Operating segments | Life Sciences |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of year | 13,472 | 13,311 |
Attributable to acquisitions | 10,291 | 213 |
Attributable to 2020 divestitures | (181) |  |
Adjustments due to finalization of purchase price adjustments | (3) | (7) |
Foreign currency translation and other | 2,233 | (45) |
Balance at end of year | 25,812 | 13,472 | 13,311
Operating segments | Diagnostics |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of year | 6,901 | 6,926 |
Attributable to acquisitions | 0 | 3 |
Attributable to 2020 divestitures | 0 |  |
Adjustments due to finalization of purchase price adjustments | 0 | 0 |
Foreign currency translation and other | 181 | (28) |
Balance at end of year | 7,082 | 6,901 | 6,926
Operating segments | Environmental & Applied Solutions |  |  |
Goodwill [Roll Forward] |  |  |
Balance at beginning of year | 2,340 | 2,344 |
Attributable to acquisitions | 111 | 1 |
Attributable to 2020 divestitures | 0 |  |
Adjustments due to finalization of purchase price adjustments | 0 | 0 |
Foreign currency translation and other | 75 | (5) |
Balance at end of year | $ 2,526 | $ 2,340 | $ 2,344

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