Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Sales	$ 7,080	$ 7,000	$ 7,204	$ 6,944	$ 5,801	$ 3,008	$ 3,044	$ 2,983	$ 28,228	$ 14,836	$ 11,358
Merchant
Disaggregation of Revenue [Line Items]
Sales									7,066	4,552
On-Site
Disaggregation of Revenue [Line Items]
Sales									6,252	4,097
Packaged Gas
Disaggregation of Revenue [Line Items]
Sales									10,113	4,517
Other
Disaggregation of Revenue [Line Items]
Sales									4,797	1,670
Americas
Disaggregation of Revenue [Line Items]
Sales									10,993	8,017
Americas | Merchant
Disaggregation of Revenue [Line Items]
Sales									2,946	2,775
Americas | On-Site
Disaggregation of Revenue [Line Items]
Sales									2,758	2,405
Americas | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales									5,185	2,800
Americas | Other
Disaggregation of Revenue [Line Items]
Sales									104	37
EMEA
Disaggregation of Revenue [Line Items]
Sales									6,643	2,644
EMEA | Merchant
Disaggregation of Revenue [Line Items]
Sales									1,856	832
EMEA | On-Site
Disaggregation of Revenue [Line Items]
Sales									1,434	536
EMEA | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales									3,347	1,271
EMEA | Other
Disaggregation of Revenue [Line Items]
Sales									6	5
APAC
Disaggregation of Revenue [Line Items]
Sales									5,839	2,446
APAC | Merchant
Disaggregation of Revenue [Line Items]
Sales									2,080	826
APAC | On-Site
Disaggregation of Revenue [Line Items]
Sales									2,060	1,156
APAC | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales									1,562	443
APAC | Other
Disaggregation of Revenue [Line Items]
Sales									137	21
Engineering
Disaggregation of Revenue [Line Items]
Sales									2,799	459
Engineering | Merchant
Disaggregation of Revenue [Line Items]
Sales									0	0
Engineering | On-Site
Disaggregation of Revenue [Line Items]
Sales									0	0
Engineering | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales									0	0
Engineering | Other
Disaggregation of Revenue [Line Items]
Sales									2,799	459
Other
Disaggregation of Revenue [Line Items]
Sales									1,954	1,270
Other | Merchant
Disaggregation of Revenue [Line Items]
Sales									184	119
Other | On-Site
Disaggregation of Revenue [Line Items]
Sales									0	0
Other | Packaged Gas
Disaggregation of Revenue [Line Items]
Sales									19	3
Other | Other
Disaggregation of Revenue [Line Items]
Sales									$ 1,751	$ 1,148
Sales | Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Concentration risk, percentage									100.00%	100.00%
Sales | Revenue from Contract with Customer Benchmark | Merchant
Disaggregation of Revenue [Line Items]
Concentration risk, percentage									25.00%	31.00%
Sales | Revenue from Contract with Customer Benchmark | On-Site
Disaggregation of Revenue [Line Items]
Concentration risk, percentage									22.00%	28.00%
Sales | Revenue from Contract with Customer Benchmark | Packaged Gas
Disaggregation of Revenue [Line Items]
Concentration risk, percentage									36.00%	30.00%
Sales | Revenue from Contract with Customer Benchmark | Other
Disaggregation of Revenue [Line Items]
Concentration risk, percentage									17.00%	11.00%