Revenue Recognition - Schedule of Revenue by Distribution Method (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Sales	$ 9,289	$ 8,495	$ 18,070	$ 16,607
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	$ 4,083	$ 3,812	$ 8,108	$ 7,478
EMEA
Disaggregation of Revenue [Line Items]
Sales	2,303	2,162	4,474	4,193
APAC
Disaggregation of Revenue [Line Items]
Sales	1,870	1,655	3,571	3,194
Engineering
Disaggregation of Revenue [Line Items]
Sales	625	551	1,142	1,116
Other
Disaggregation of Revenue [Line Items]
Sales	408	315	775	626
Merchant
Disaggregation of Revenue [Line Items]
Sales	$ 2,784	$ 2,595	$ 5,372	$ 4,972
Merchant \| Revenue from Contract with Customer \| Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	30.00%	31.00%	30.00%	30.00%
Merchant \| Americas
Disaggregation of Revenue [Line Items]
Sales	$ 1,352	$ 1,260	$ 2,648	$ 2,410
Merchant \| EMEA
Disaggregation of Revenue [Line Items]
Sales	763	726	1,482	1,397
Merchant \| APAC
Disaggregation of Revenue [Line Items]
Sales	616	558	1,150	1,067
Merchant \| Engineering
Disaggregation of Revenue [Line Items]
Sales	0	0	0	0
Merchant \| Other
Disaggregation of Revenue [Line Items]
Sales	53	51	92	98
On-Site
Disaggregation of Revenue [Line Items]
Sales	$ 2,190	$ 2,002	$ 4,348	$ 3,983
On-Site \| Revenue from Contract with Customer \| Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.00%	24.00%	24.00%	24.00%
On-Site \| Americas
Disaggregation of Revenue [Line Items]
Sales	$ 946	$ 878	$ 1,954	$ 1,766
On-Site \| EMEA
Disaggregation of Revenue [Line Items]
Sales	480	426	905	852
On-Site \| APAC
Disaggregation of Revenue [Line Items]
Sales	764	698	1,489	1,365
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	$ 3,168	$ 2,976	$ 6,205	$ 5,797
Packaged Gas \| Revenue from Contract with Customer \| Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	34.00%	35.00%	34.00%	35.00%
Packaged Gas \| Americas
Disaggregation of Revenue [Line Items]
Sales	$ 1,708	$ 1,617	$ 3,357	$ 3,189
Packaged Gas \| EMEA
Disaggregation of Revenue [Line Items]
Sales	1,053	1,002	2,072	1,928
Packaged Gas \| APAC
Disaggregation of Revenue [Line Items]
Sales	402	350	765	666
Packaged Gas \| Engineering
Disaggregation of Revenue [Line Items]
Sales	0	0	0	0
Packaged Gas \| Other
Disaggregation of Revenue [Line Items]
Sales	5	7	11	14
Other
Disaggregation of Revenue [Line Items]
Sales	$ 1,147	$ 922	$ 2,145	$ 1,855
Other \| Revenue from Contract with Customer \| Sales Channel
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	12.00%	10.00%	12.00%	11.00%
Other \| Americas
Disaggregation of Revenue [Line Items]
Sales	$ 77	$ 57	$ 149	$ 113
Other \| EMEA
Disaggregation of Revenue [Line Items]
Sales	7	8	15	16
Other \| APAC
Disaggregation of Revenue [Line Items]
Sales	88	49	167	96
Other \| Engineering
Disaggregation of Revenue [Line Items]
Sales	625	551	1,142	1,116
Other \| Other
Disaggregation of Revenue [Line Items]
Sales	$ 350	$ 257	$ 672	$ 514