Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total sales	$ 7,204	$ 3,044	$ 14,148	$ 6,027
Americas
Disaggregation of Revenue [Line Items]
Total sales	2,779	1,865	5,485	3,715
EMEA
Disaggregation of Revenue [Line Items]
Total sales	1,673	435	3,355	850
APAC
Disaggregation of Revenue [Line Items]
Total sales	1,513	460	2,965	895
Engineering
Disaggregation of Revenue [Line Items]
Total sales	752	0	1,388	0
Other
Disaggregation of Revenue [Line Items]
Total sales	487	284	955	567
Merchant
Disaggregation of Revenue [Line Items]
Total sales	1,815	1,037	3,474	2,032
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total sales	735	697	1,439	1,375
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total sales	476	153	903	300
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total sales	551	156	1,048	295
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total sales	0	0	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total sales	53	31	84	62
On-Site
Disaggregation of Revenue [Line Items]
Total sales	1,588	885	3,198	1,786
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total sales	699	559	1,402	1,135
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total sales	355	78	732	159
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total sales	534	248	1,064	492
On-Site | Engineering
Disaggregation of Revenue [Line Items]
Total sales	0	0	0	0
On-Site | Other
Disaggregation of Revenue [Line Items]
Total sales	0	0	0	0
Packaged Gas
Disaggregation of Revenue [Line Items]
Total sales	2,549	857	5,103	1,683
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total sales	1,315	601	2,602	1,192
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total sales	842	202	1,716	386
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total sales	386	54	779	105
Packaged Gas | Engineering
Disaggregation of Revenue [Line Items]
Total sales	0	0	0	0
Packaged Gas | Other
Disaggregation of Revenue [Line Items]
Total sales	6	0	6	0
Other
Disaggregation of Revenue [Line Items]
Total sales	1,252	265	2,373	526
Other | Americas
Disaggregation of Revenue [Line Items]
Total sales	30	8	42	13
Other | EMEA
Disaggregation of Revenue [Line Items]
Total sales	0	2	4	5
Other | APAC
Disaggregation of Revenue [Line Items]
Total sales	42	2	74	3
Other | Engineering
Disaggregation of Revenue [Line Items]
Total sales	752	0	1,388	0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	$ 428	$ 253	$ 865	$ 505
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	25.00%	34.00%	25.00%	34.00%
Revenue from Contract with Customer | Sales Channel | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22.00%	29.00%	22.00%	29.00%
Revenue from Contract with Customer | Sales Channel | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	36.00%	28.00%	36.00%	28.00%
Revenue from Contract with Customer | Sales Channel | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	17.00%	9.00%	17.00%	9.00%