Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total segment sales	$ 8,211	$ 7,243
Americas
Disaggregation of Revenue [Line Items]
Total segment sales	3,241	2,840
EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	2,148	1,799
APAC
Disaggregation of Revenue [Line Items]
Total segment sales	1,602	1,436
Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	728	674
Other
Disaggregation of Revenue [Line Items]
Total segment sales	492	494
Merchant
Disaggregation of Revenue [Line Items]
Total segment sales	2,043	1,839
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	874	771
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	614	531
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	516	484
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total segment sales	39	53
On-Site
Disaggregation of Revenue [Line Items]
Total segment sales	2,169	1,634
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	883	689
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	631	392
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	655	553
On-Site | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
On-Site | Other
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
Packaged Gas
Disaggregation of Revenue [Line Items]
Total segment sales	2,691	2,560
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	1,432	1,332
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	891	861
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	361	361
Packaged Gas | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
Packaged Gas | Other
Disaggregation of Revenue [Line Items]
Total segment sales	7	6
Other
Disaggregation of Revenue [Line Items]
Total segment sales	1,308	1,210
Other | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	52	48
Other | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	12	15
Other | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	70	38
Other | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	728	674
Other | Other
Disaggregation of Revenue [Line Items]
Total segment sales	$ 446	$ 435
Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Revenue from Contract with Customer | Sales Channel | Merchant
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	25.00%	25.00%
Revenue from Contract with Customer | Sales Channel | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	26.00%	23.00%
Revenue from Contract with Customer | Sales Channel | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	33.00%	35.00%
Revenue from Contract with Customer | Sales Channel | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	16.00%	17.00%