Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total segment sales	$ 6,377	$ 7,204	$ 13,116	$ 14,148
Net sales	25			55
Americas
Disaggregation of Revenue [Line Items]
Total segment sales	2,417	2,779	5,094	5,481
EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	1,448	1,673	3,081	3,355
APAC
Disaggregation of Revenue [Line Items]
Total segment sales	1,295	1,488	2,631	2,915
Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	810	752	1,418	1,388
Other
Disaggregation of Revenue [Line Items]
Total segment sales	407	512	892	1,009
Merchant
Disaggregation of Revenue [Line Items]
Total segment sales	1,537	1,815	3,239	3,473
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	634	735	1,360	1,438
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	415	476	885	903
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	459	551	918	1,048
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total segment sales	29	53	76	84
On-Site
Disaggregation of Revenue [Line Items]
Total segment sales	1,329	1,569	2,814	3,159
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	559	699	1,209	1,401
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	304	355	647	732
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	466	515	958	1,026
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	2,297	2,543	4,748	5,089
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	1,210	1,315	2,485	2,600
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	719	842	1,530	1,716
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	362	380	722	767
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	6	6	11	6
Other
Disaggregation of Revenue [Line Items]
Total segment sales	1,214	1,277	2,315	2,427
Other | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	14	30	40	42
Other | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	10	0	19	4
Other | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	8	42	33	74
Other | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	810	752	1,418	1,388
Other | Other
Disaggregation of Revenue [Line Items]
Total segment sales	$ 372	$ 453	$ 805	$ 919
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	24.00%	25.00%	25.00%	25.00%
Revenue from Contract with Customer | Sales Channel | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	21.00%	22.00%	21.00%	22.00%
Revenue from Contract with Customer | Sales Channel | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	36.00%	35.00%	36.00%	36.00%
Revenue from Contract with Customer | Sales Channel | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	19.00%	18.00%	18.00%	17.00%