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Merger-related Divestitures - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Net gain on sale of businesses |  |  | $ 0 | $ 164 | $ 0 | $ 164 |  |  |
Linde AG South America Divestiture | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid |  | $ 2,900 |  |  |  |  |  |  |
Americas Industrial Gases Business, Plant Sales | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Proceeds for incremental plant sales |  | $ 500 |  |  |  |  |  |  |
Linde Korea Divestiture | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  |  | $ 1,200
Praxair India Divestiture | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid | $ 218 |  |  |  |  |  |  |  |
Net gain on sale of businesses | $ 164 |  |  |  |  |  |  |  |
Linde India Divestiture | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  | $ 193 |
Linde China Divestiture | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  | $ 98 |  |

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