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Discontinued Operations (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 18, 2019 | Oct. 24, 2019 | Sep. 20, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 17, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain on disposition of Envista before income taxes |  |  |  |  |  |  | $ 451 |  | $ 0
Reclassification from AOCI |  |  |  |  |  | $ (407) | (172) |  | (30)
Discontinued operation, revenues |  |  |  |  |  |  | 2,610 |  | 2,845
Payments of debt extinguishment costs |  | $ 7 |  |  | $ 7 | 26 | $ 7 |  | 0
Payments of debt extinguishment costs, after-tax |  | $ 5 |  |  | $ 5 |  |  |  |
Payments of debt extinguishment costs, per diluted common share |  | $ 0.01 |  |  | $ 0.01 |  |  |  |
Senior notes | Redeemed notes |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 882 | $ 882 |  |  |  |
Senior notes | 2.4% senior unsecured notes due 2020 |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 500 |  |  |  |  |  |  |
Interest rate of debt instrument |  | 2.40% |  |  | 2.40% |  | 2.40% |  |
Senior notes | 5.0% senior unsecured notes due 2020 |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 375 |  |  |  |  |  |  |
Interest rate of debt instrument |  | 5.00% |  |  | 5.00% |  | 5.00% |  |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Reclassification from AOCI |  |  |  |  |  | $ 0 | $ (109) |  | 0
Envista Separation | Envista Split-Off |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership after transaction | 80.60% |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  | 22.9 |  |
Gain on disposition of Envista before income taxes |  |  |  | $ 451 |  |  |  |  |
Increase to noncontrolling interest |  |  |  |  |  |  | $ 689 |  |
Noncontrolling interest, decrease from deconsolidation |  |  |  |  |  |  | 692 |  |
Discontinued operation, revenues |  |  |  |  |  |  |  | $ 2,600 | 2,800
Separation and IPO costs |  |  |  |  |  |  | $ 69 |  | $ 15
Envista Separation | Envista Split-Off | Foreign currency translation adjustments |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Reclassification from AOCI | $ (109) |  |  |  |  |  |  |  |
Envista Separation | IPO |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued in transaction |  |  | 30.8 |  |  |  |  |  |
Price per share |  |  | $ 22.00 |  |  |  |  |  |
Proceeds from issuance or sale of equity |  |  | $ 643 |  |  |  |  |  |
Sale of stock, consideration transfered |  |  | 2,000 |  |  |  |  |  |
Proceeds from issuance of debt |  |  | 1,300 |  |  |  |  |  |
Sale of Envista Holdings Corporation common stock |  |  | $ 60 |  |  |  |  |  |
Envista Separation | IPO | Danaher |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  | 19.40% |  |  |  |  |  |

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