Business Combination and Divestitures - Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 5	$ 4	$ 109
Noncontrolling interests	0	0	(7)
Income from continuing operations, net of tax and noncontrolling interests	5	4	102
Discontinued Operations, Disposed of by Sale | Linde AG Merger-Related Divestitures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	5	7	449
Cost of sales	1	3	251
Other operating costs	1	1	43
Operating profit	3	3	155
Income from equity investments	2	1	8
Income taxes	0	0	54
Income from discontinued operations, net of tax	5	4	109
Noncontrolling interests	0	0	(7)
Income from continuing operations, net of tax and noncontrolling interests	$ 5	$ 4	$ 102