Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total sales	$ 6,944	$ 2,983
Americas
Disaggregation of Revenue [Line Items]
Total sales	2,706	1,850
EMEA
Disaggregation of Revenue [Line Items]
Total sales	1,682	415
APAC
Disaggregation of Revenue [Line Items]
Total sales	1,452	435
Engineering
Disaggregation of Revenue [Line Items]
Total sales	636	0
Other
Disaggregation of Revenue [Line Items]
Total sales	468	283
Merchant
Disaggregation of Revenue [Line Items]
Total sales	1,659	1,010
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total sales	704	694
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total sales	427	148
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total sales	497	138
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total sales	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total sales	31	30
On-Site
Disaggregation of Revenue [Line Items]
Total sales	1,610	885
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total sales	703	559
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total sales	377	81
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total sales	530	245
On-Site | Engineering
Disaggregation of Revenue [Line Items]
Total sales	0	0
On-Site | Other
Disaggregation of Revenue [Line Items]
Total sales	0	0
Packaged Gas
Disaggregation of Revenue [Line Items]
Total sales	2,554	826
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total sales	1,287	591
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total sales	874	184
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total sales	393	51
Packaged Gas | Engineering
Disaggregation of Revenue [Line Items]
Total sales	0	0
Packaged Gas | Other
Disaggregation of Revenue [Line Items]
Total sales	0	0
Other
Disaggregation of Revenue [Line Items]
Total sales	1,121	262
Other | Americas
Disaggregation of Revenue [Line Items]
Total sales	12	6
Other | EMEA
Disaggregation of Revenue [Line Items]
Total sales	4	2
Other | APAC
Disaggregation of Revenue [Line Items]
Total sales	32	1
Other | Engineering
Disaggregation of Revenue [Line Items]
Total sales	636	0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	$ 437	$ 253
Revenue from Contract with Customer | Sales Channel [Member]
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Revenue from Contract with Customer | Sales Channel [Member] | Merchant
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.00%	34.00%
Revenue from Contract with Customer | Sales Channel [Member] | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	23.00%	30.00%
Revenue from Contract with Customer | Sales Channel [Member] | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	37.00%	28.00%
Revenue from Contract with Customer | Sales Channel [Member] | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	16.00%	8.00%