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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) | Apr. 02, 2021 USD ($) Business | Apr. 03, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of businesses acquired | Business |  |  | 6 |  |  |
Net cash consideration |  |  | $ 419 | $ 20,735 |  |
Number of segments reported | Business |  |  | 3 |  |  |
Revenue reported by acquired entity for last annual period |  |  | $ 55 |  |  |
Proceeds from sale of product lines | $ 826 |  | 26 | 0 |  |
Pretax gain on sale of product lines | 455 |  | 13 | 0 |  |
Gain on sale of product lines, net of tax | $ 305 |  | 10 |  |  |
Gain on sale of product lines, net of tax, per diluted common share | $ / shares | $ 0.42 |  |  |  |  |
Disposal group, product lines, revenues |  |  |  |  | $ 88 | $ 170
Cytiva |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  | $ 20,700 |  |  |  |
Cash acquired |  | 100 |  |  |  |
Pension liabilities |  | $ 400 |  |  |  |
Cytiva | Fair value adjustment to inventory |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Pro forma earnings, adjustments |  |  | $ 46 |  |  |
Cytiva | Acquisition-related transaction costs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Pro forma earnings, adjustments |  |  |  | $ 59 |  |

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