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Goodwill And Other Intangible Assets (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Reporting_Unit | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |
Reporting units for goodwill impairment testing | Reporting_Unit | 5 |  |
Goodwill | $ 35,420 | $ 22,713 | $ 22,581
Impairment loss | 0 | 0 | 0
Adjustments due to finalization of purchase price adjustments | $ (3) | $ (7) |
Finite-lived intangible assets, weighted-average life (in years) | 17 years | 13 years |
Asset impairment charges | $ 22 |  |
Amortization of intangible assets | 1,138 | $ 625 | $ 616
Future amortization expense, year one | 1,380 |  |
Future amortization expense, year two | 1,362 |  |
Future amortization expense, year three | 1,357 |  |
Future amortization expense, year four | 1,316 |  |
Future amortization expense, year five | 1,291 |  |
Cytiva |  |  |
Goodwill [Line Items] |  |  |
Adjustments due to finalization of purchase price adjustments | (1,300) |  |
Minimum |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 512 |  |
Maximum |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 24,900 |  |

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