Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Sales	$ 8,615	$ 8,356	$ 25,222	$ 24,723
Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Americas
Disaggregation of Revenue [Line Items]
Sales	$ 3,846	$ 3,618	$ 11,324	$ 10,833
EMEA
Disaggregation of Revenue [Line Items]
Sales	2,178	2,111	6,371	6,293
APAC
Disaggregation of Revenue [Line Items]
Sales	1,741	1,716	4,935	4,964
Engineering
Disaggregation of Revenue [Line Items]
Sales	519	611	1,635	1,694
Other
Disaggregation of Revenue [Line Items]
Sales	331	300	957	939
Merchant
Disaggregation of Revenue [Line Items]
Sales	$ 2,619	$ 2,501	$ 7,591	$ 7,377
Merchant | Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	30.00%	30.00%	30.00%	30.00%
Merchant | Americas
Disaggregation of Revenue [Line Items]
Sales	$ 1,242	$ 1,160	$ 3,652	$ 3,455
Merchant | EMEA
Disaggregation of Revenue [Line Items]
Sales	736	704	2,133	2,081
Merchant | APAC
Disaggregation of Revenue [Line Items]
Sales	591	589	1,658	1,686
Merchant | Engineering
Disaggregation of Revenue [Line Items]
Sales	0	0	0	0
Merchant | Other
Disaggregation of Revenue [Line Items]
Sales	50	48	148	155
On-Site
Disaggregation of Revenue [Line Items]
Sales	$ 2,034	$ 1,920	$ 6,017	$ 5,698
On-Site | Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.00%	23.00%	24.00%	23.00%
On-Site | Americas
Disaggregation of Revenue [Line Items]
Sales	$ 893	$ 799	$ 2,659	$ 2,388
On-Site | EMEA
Disaggregation of Revenue [Line Items]
Sales	424	441	1,276	1,294
On-Site | APAC
Disaggregation of Revenue [Line Items]
Sales	717	680	2,082	2,016
On-Site | Engineering
Disaggregation of Revenue [Line Items]
Sales	0	0	0	0
On-Site | Other
Disaggregation of Revenue [Line Items]
Sales	0	0	0	0
Packaged Gas
Disaggregation of Revenue [Line Items]
Sales	$ 3,033	$ 2,935	$ 8,830	$ 8,762
Packaged Gas | Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	35.00%	35.00%	35.00%	35.00%
Packaged Gas | Americas
Disaggregation of Revenue [Line Items]
Sales	$ 1,641	$ 1,602	$ 4,830	$ 4,825
Packaged Gas | EMEA
Disaggregation of Revenue [Line Items]
Sales	1,011	954	2,939	2,874
Packaged Gas | APAC
Disaggregation of Revenue [Line Items]
Sales	375	371	1,041	1,041
Packaged Gas | Engineering
Disaggregation of Revenue [Line Items]
Sales	0	0	0	0
Packaged Gas | Other
Disaggregation of Revenue [Line Items]
Sales	6	8	20	22
Other
Disaggregation of Revenue [Line Items]
Sales	$ 929	$ 1,000	$ 2,784	$ 2,886
Other | Revenue from Contract with Customer | Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	11.00%	12.00%	11.00%	12.00%
Other | Americas
Disaggregation of Revenue [Line Items]
Sales	$ 70	$ 57	$ 183	$ 165
Other | EMEA
Disaggregation of Revenue [Line Items]
Sales	7	12	23	44
Other | APAC
Disaggregation of Revenue [Line Items]
Sales	58	76	154	221
Other | Engineering
Disaggregation of Revenue [Line Items]
Sales	519	611	1,635	1,694
Other | Other
Disaggregation of Revenue [Line Items]
Sales	$ 275	$ 244	$ 789	$ 762