Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total segment sales	$ 6,739	$ 6,944
Americas
Disaggregation of Revenue [Line Items]
Total segment sales	2,677	2,702
EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	1,633	1,682
APAC
Disaggregation of Revenue [Line Items]
Total segment sales	1,336	1,427
Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	608	636
Other
Disaggregation of Revenue [Line Items]
Total segment sales	485	497
Merchant
Disaggregation of Revenue [Line Items]
Total segment sales	1,702	1,658
Merchant | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	726	703
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	470	427
Merchant | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	459	497
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Total segment sales	47	31
On-Site
Disaggregation of Revenue [Line Items]
Total segment sales	1,485	1,590
On-Site | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	650	702
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	343	377
On-Site | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	492	511
On-Site | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
On-Site | Other
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
Packaged Gas
Disaggregation of Revenue [Line Items]
Total segment sales	2,451	2,546
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	1,275	1,285
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	811	874
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	360	387
Packaged Gas | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	0	0
Packaged Gas | Other
Disaggregation of Revenue [Line Items]
Total segment sales	5	0
Other
Disaggregation of Revenue [Line Items]
Total segment sales	1,101	1,150
Other | Americas
Disaggregation of Revenue [Line Items]
Total segment sales	26	12
Other | EMEA
Disaggregation of Revenue [Line Items]
Total segment sales	9	4
Other | APAC
Disaggregation of Revenue [Line Items]
Total segment sales	25	32
Other | Engineering
Disaggregation of Revenue [Line Items]
Total segment sales	608	636
Other | Other
Disaggregation of Revenue [Line Items]
Total segment sales	$ 433	$ 466
Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Revenue from Contract with Customer | Sales Channel | Merchant
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	25.00%	24.00%
Revenue from Contract with Customer | Sales Channel | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	22.00%	23.00%
Revenue from Contract with Customer | Sales Channel | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	36.00%	37.00%
Revenue from Contract with Customer | Sales Channel | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	17.00%	16.00%