Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total segment sales	$ 8,457	$ 7,584	$ 16,668	$ 14,827
Americas
Disaggregation of Revenue [Line Items]
Total segment sales	3,518	3,020	6,759	5,860
EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	2,144	1,875	4,292	3,674
APAC
Disaggregation of Revenue [Line Items]
Total segment sales	1,651	1,544	3,253	2,980
Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	644	646	1,372	1,320
Other
Disaggregation of Revenue [Line Items]
Total segment sales	500	499	992	993
Merchant
Disaggregation of Revenue [Line Items]
Total segment sales	2,177	1,971	4,220	3,809
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	941	821	1,815	1,592
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	634	556	1,248	1,087
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	562	551	1,078	1,035
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total segment sales	40	43	79	95
On-Site
Disaggregation of Revenue [Line Items]
Total segment sales	2,290	1,752	4,458	3,385
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	1,049	774	1,931	1,463
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	610	396	1,241	788
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	631	582	1,286	1,134
On-Site | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0	0	0
On-Site | Other
Disaggregation of Revenue [Line Items]
Total segment sales	0	0	0	0
Packaged Gas
Disaggregation of Revenue [Line Items]
Total segment sales	2,755	2,679	5,447	5,238
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	1,473	1,369	2,906	2,701
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	884	912	1,775	1,772
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	389	392	750	753
Packaged Gas | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0	0	0
Packaged Gas | Other
Disaggregation of Revenue [Line Items]
Total segment sales	9	6	16	12
Other
Disaggregation of Revenue [Line Items]
Total segment sales	1,235	1,182	2,543	2,395
Other | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	55	56	107	104
Other | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	16	11	28	27
Other | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	69	19	139	58
Other | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	644	646	1,372	1,320
Other | Other
Disaggregation of Revenue [Line Items]
Total segment sales	$ 451	$ 450	$ 897	$ 886
Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer | Sales Channel | Merchant
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	26.00%	26.00%	25.00%	26.00%
Revenue from Contract with Customer | Sales Channel | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	27.00%	23.00%	27.00%	23.00%
Revenue from Contract with Customer | Sales Channel | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	33.00%	35.00%	33.00%	35.00%
Revenue from Contract with Customer | Sales Channel | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	15.00%	16.00%	15.00%	16.00%