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Supplemental Information - Additional Information (Details) € in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Trade and Other receivables	$ 4,638			$ 4,638	$ 4,628
Provision for allowance for credit loss				182	170	$ 25
Depreciation				3,861	3,940	1,615
Amortization of intangibles (Note 10)				765	735	215
Repayments of long-term debt				2,681	1,583	3,124
Interest charge				16	0	26
Noncontrolling interests income from operations				125	87	12
Estimated income tax payments	115			115
Long-term receivables reserves	34			34	44
Purchase accounting impacts - Linde AG				57	54	$ 24
Trade Receivable | Less Than 1 Year
Segment Reporting Information [Line Items]
Trade and Other receivables	4,169			4,169	4,075
Trade Receivable | Greater Than 1 Year
Segment Reporting Information [Line Items]
Trade and Other receivables	358			358	249
Other Receivables
Segment Reporting Information [Line Items]
Trade and Other receivables	$ 111			$ 111	$ 304
Linde AG
Segment Reporting Information [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	8.00%	8.00%	8.00%	8.00%	8.00%	8.00%
4.50% Notes due 2019
Segment Reporting Information [Line Items]
Repayments of long-term debt		$ 600		$ 500
Interest rate	4.05%	4.50%	4.50%	4.05%		4.50%
Euro Denominated Long-term 1.50% Notes Due 2020
Segment Reporting Information [Line Items]
Repayments of long-term debt | €			€ 600
Interest rate		1.50%	1.50%			1.50%
3.00% Notes due 2021
Segment Reporting Information [Line Items]
Repayments of long-term debt	$ 500			$ 500
Interest rate	3.00%			3.00%	3.00%
Linde AG
Segment Reporting Information [Line Items]
Depreciation				$ 1,267	$ 1,298
Amortization of intangibles (Note 10)				$ 653	642
Noncontrolling interests income from operations					$ 1	$ (35)

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