Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) distribution_method	Dec. 31, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Number of gas distribution methods | distribution_method	3
Contract assets	$ 398	$ 336
Contract​ ​asset​, current	321	269
Contract​ asset in other long-term assets	77	67
Contract liabilities	2,456	2,515
Contract liabilities, current	1,168	1,231
Contract liabilities in other long-term liabilities	1,288	$ 1,284
Revenue recognized	378
Estimated consideration related to unsatisfied performance obligations	$ 64,000
Long-term supply contracts (years)	30 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Disaggregation of Revenue [Line Items]
Remaining performance obligations, period	6 years
Remaining performance obligation, percentage	50.00%
Minimum
Disaggregation of Revenue [Line Items]
On-site product supply contract (years)	10 years
Minimum | Merchant
Disaggregation of Revenue [Line Items]
Customer supply agreements (years)	3 years
Minimum | Packaged Gas
Disaggregation of Revenue [Line Items]
Customer supply agreements (years)	1 year
Maximum
Disaggregation of Revenue [Line Items]
On-site product supply contract (years)	20 years
Maximum | Merchant
Disaggregation of Revenue [Line Items]
Customer supply agreements (years)	7 years
Maximum | Packaged Gas
Disaggregation of Revenue [Line Items]
Customer supply agreements (years)	3 years