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Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total segment sales	$ 6,855	$ 7,000	$ 19,971	$ 21,148
Net sales	7			62
Americas
Disaggregation of Revenue [Line Items]
Total segment sales	2,641	2,771	7,735	8,252
EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	1,622	1,634	4,703	4,989
APAC
Disaggregation of Revenue [Line Items]
Total segment sales	1,484	1,461	4,115	4,376
Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	678	641	2,096	2,029
Other
Disaggregation of Revenue [Line Items]
Total segment sales	430	493	1,322	1,502
Merchant
Disaggregation of Revenue [Line Items]
Total segment sales	1,771	1,809	5,010	5,282
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	739	760	2,099	2,198
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	472	474	1,357	1,377
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	526	523	1,444	1,571
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total segment sales	34	52	110	136
On-Site
Disaggregation of Revenue [Line Items]
Total segment sales	1,484	1,515	4,298	4,675
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	622	676	1,831	2,077
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	334	345	981	1,077
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	528	494	1,486	1,521
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	2,482	2,521	7,230	7,609
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	1,265	1,303	3,750	3,903
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	799	815	2,329	2,531
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	413	396	1,135	1,162
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	5	7	16	13
Other
Disaggregation of Revenue [Line Items]
Total segment sales	1,118	1,155	3,433	3,582
Other | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	15	32	55	74
Other | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	17	0	36	4
Other | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	17	48	50	122
Other | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	678	641	2,096	2,029
Other | Other
Disaggregation of Revenue [Line Items]
Total segment sales	$ 391	$ 434	$ 1,196	$ 1,353
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%	25.00%
Revenue from Contract with Customer | Sales Channel | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22.00%	22.00%	22.00%	22.00%
Revenue from Contract with Customer | Sales Channel | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	36.00%	36.00%	36.00%	36.00%
Revenue from Contract with Customer | Sales Channel | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	16.00%	16.00%	17.00%	17.00%

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