Revenue Recognition - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) distribution_method	Dec. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Number of gas distribution methods | distribution_method	3
Contract assets	$ 285	$ 263
Contract​ ​asset​, current	228
Contract​ asset in other long-term assets	57
Contract liabilities	2,533	2,292
Contract liabilities, current	1,279	1,194
Contract liabilities in other long-term liabilities	1,254	$ 1,098
Revenue recognized	641
Estimated consideration related to unsatisfied performance obligations	$ 62,000
Long-term supply contracts (years)	20 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
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