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Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 27,243	$ 28,228	$ 14,836
Merchant
Disaggregation of Revenue [Line Items]
Sales	6,859	7,065	4,552
On-Site
Disaggregation of Revenue [Line Items]
Sales	5,916	6,211	4,097
Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	9,790	10,091	4,517
Other
Disaggregation of Revenue [Line Items]
Sales	4,678	4,861	1,670
Americas
Disaggregation of Revenue [Line Items]
Sales	10,459	10,989	8,017
Americas | Merchant
Disaggregation of Revenue [Line Items]
Sales	2,839	2,945	2,775
Americas | On-Site
Disaggregation of Revenue [Line Items]
Sales	2,513	2,757	2,405
Americas | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	5,034	5,183	2,800
Americas | Other
Disaggregation of Revenue [Line Items]
Sales	73	104	37
EMEA
Disaggregation of Revenue [Line Items]
Sales	6,449	6,643	2,644
EMEA | Merchant
Disaggregation of Revenue [Line Items]
Sales	1,870	1,856	832
EMEA | On-Site
Disaggregation of Revenue [Line Items]
Sales	1,354	1,434	536
EMEA | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	3,175	3,347	1,271
EMEA | Other
Disaggregation of Revenue [Line Items]
Sales	50	6	5
APAC
Disaggregation of Revenue [Line Items]
Sales	5,687	5,779	2,446
APAC | Merchant
Disaggregation of Revenue [Line Items]
Sales	2,005	2,080	826
APAC | On-Site
Disaggregation of Revenue [Line Items]
Sales	2,049	2,020	1,156
APAC | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	1,559	1,542	443
APAC | Other
Disaggregation of Revenue [Line Items]
Sales	74	137	21
Engineering
Disaggregation of Revenue [Line Items]
Sales	2,851	2,799	459
Engineering | Merchant
Disaggregation of Revenue [Line Items]
Sales	0	0	0
Engineering | On-Site
Disaggregation of Revenue [Line Items]
Sales	0	0	0
Engineering | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	0	0	0
Engineering | Other
Disaggregation of Revenue [Line Items]
Sales	2,851	2,799	459
Other
Disaggregation of Revenue [Line Items]
Sales	1,797	2,018	1,270
Other | Merchant
Disaggregation of Revenue [Line Items]
Sales	145	184	119
Other | On-Site
Disaggregation of Revenue [Line Items]
Sales	0	0	0
Other | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	22	19	3
Other | Other
Disaggregation of Revenue [Line Items]
Sales	$ 1,630	$ 1,815	$ 1,148
Sales | Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Sales | Revenue from Contract with Customer Benchmark | Merchant
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	25.00%	25.00%	31.00%
Sales | Revenue from Contract with Customer Benchmark | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22.00%	22.00%	28.00%
Sales | Revenue from Contract with Customer Benchmark | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	36.00%	36.00%	30.00%
Sales | Revenue from Contract with Customer Benchmark | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	17.00%	17.00%	11.00%

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