Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 30,793	$ 27,243	$ 28,228
Merchant
Disaggregation of Revenue [Line Items]
Sales	7,860	6,859	7,065
On-Site
Disaggregation of Revenue [Line Items]
Sales	7,345	5,916	6,211
Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	10,551	9,790	10,091
Other
Disaggregation of Revenue [Line Items]
Sales	5,037	4,678	4,861
Americas
Disaggregation of Revenue [Line Items]
Sales	12,103	10,459	10,989
Americas | Merchant
Disaggregation of Revenue [Line Items]
Sales	3,279	2,839	2,945
Americas | On-Site
Disaggregation of Revenue [Line Items]
Sales	3,225	2,513	2,757
Americas | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	5,456	5,034	5,183
Americas | Other
Disaggregation of Revenue [Line Items]
Sales	143	73	104
EMEA
Disaggregation of Revenue [Line Items]
Sales	7,643	6,449	6,643
EMEA | Merchant
Disaggregation of Revenue [Line Items]
Sales	2,227	1,870	1,856
EMEA | On-Site
Disaggregation of Revenue [Line Items]
Sales	1,824	1,354	1,434
EMEA | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	3,539	3,175	3,347
EMEA | Other
Disaggregation of Revenue [Line Items]
Sales	53	50	6
APAC
Disaggregation of Revenue [Line Items]
Sales	6,133	5,687	5,779
APAC | Merchant
Disaggregation of Revenue [Line Items]
Sales	2,181	2,005	2,080
APAC | On-Site
Disaggregation of Revenue [Line Items]
Sales	2,296	2,049	2,020
APAC | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	1,532	1,559	1,542
APAC | Other
Disaggregation of Revenue [Line Items]
Sales	124	74	137
Engineering
Disaggregation of Revenue [Line Items]
Sales	2,867	2,851	2,799
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	2,867	2,851	2,799
Other
Disaggregation of Revenue [Line Items]
Sales	2,047	1,797	2,018
Other | Merchant
Disaggregation of Revenue [Line Items]
Sales	173	145	184
Other | On-Site
Disaggregation of Revenue [Line Items]
Sales	0	0	0
Other | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	24	22	19
Other | Other
Disaggregation of Revenue [Line Items]
Sales	$ 1,850	$ 1,630	$ 1,815
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	26.00%	25.00%	25.00%
Sales | Revenue from Contract with Customer Benchmark | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.00%	22.00%	22.00%
Sales | Revenue from Contract with Customer Benchmark | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	34.00%	36.00%	36.00%
Sales | Revenue from Contract with Customer Benchmark | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	16.00%	17.00%	17.00%