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Revenue Recognition - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Contract assets	$ 170	$ 368
Contract liabilities	2,202	2,106
Contract liabilities, current	1,714	1,758
Contract liabilities in other long-term liabilities	488	$ 348
Revenue recognized	1,002
Estimated consideration related to unsatisfied performance obligations	$ 46,000
Long-term supply contracts	20 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations, period	5 years
Remaining performance obligation, percentage	50.00%
Americas, APAC, and EMEA Segments
Disaggregation of Revenue [Line Items]
Number of geographic segments | segment	3
Americas, APAC, and EMEA Segments | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	83.00%
Engineering | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	17.00%
Minimum
Disaggregation of Revenue [Line Items]
On-site product supply contract	10 years
Minimum | Merchant
Disaggregation of Revenue [Line Items]
Customer supply agreements	3 years
Minimum | Packaged Gas
Disaggregation of Revenue [Line Items]
Customer supply agreements	1 year
Maximum
Disaggregation of Revenue [Line Items]
On-site product supply contract	20 years
Maximum | Merchant
Disaggregation of Revenue [Line Items]
Customer supply agreements	7 years
Maximum | Packaged Gas
Disaggregation of Revenue [Line Items]
Customer supply agreements	3 years

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