Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contract assets	$ 100	$ 134
Contract liabilities	3,874	3,699
Contract liabilities, current	3,035	2,940
Contract liabilities in other long-term liabilities	839	$ 759
Revenue recognized	611
Estimated consideration related to unsatisfied performance obligations	$ 51,000
Long-term supply contracts	20 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations, period	5 years
Remaining performance obligation, percentage	50.00%
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