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Retirement Programs - Assumptions Used in Determining Benefit Obligations and Net Benefit Costs (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate   2.39% 3.19%
Discount rate   3.19% 4.16%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Healthcare cost trend assumed   6.50% 5.49%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)   5.00% 4.50%
Praxair, Inc. | OPEB      
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Healthcare cost trend assumed   6.50% 7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)   5.00% 5.00%
U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate   2.40% 3.20%
Interest crediting rate   1.57% 2.19%
Rate of increase in compensation levels   3.25% 3.25%
Discount rate   3.20% 4.20%
Interest crediting rate   2.19% 3.34%
Rate of increase in compensation levels   3.25% 3.25%
Expected long-term rate of return on plan assets   7.00% 7.27%
Actual rate of return on plan assets   9.50%  
U.S. | Scenario, Forecast | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 7.00%    
International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate   1.36% 1.91%
Interest crediting rate   1.01% 1.08%
Rate of increase in compensation levels   2.55% 2.46%
Discount rate   1.91% 2.72%
Interest crediting rate   1.08% 1.23%
Rate of increase in compensation levels   2.46% 2.38%
Expected long-term rate of return on plan assets   5.31% 5.15%
Actual rate of return on plan assets   7.90%  
International | Scenario, Forecast | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on plan assets 5.27%    
Equity Securities | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets   7.70%  
Equity Securities | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets   6.40%  
Fixed Income Investments | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets   5.40%  
Fixed Income Investments | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets   4.80%  
Other Investment | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets   6.30%  
Other Investment | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets   5.00%  
Minimum | Equity Securities | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   40.00% 40.00%
Minimum | Equity Securities | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   15.00% 15.00%
Minimum | Fixed Income Investments | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   30.00% 30.00%
Minimum | Fixed Income Investments | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   30.00% 30.00%
Minimum | Other Investment | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   5.00% 5.00%
Minimum | Other Investment | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   30.00% 30.00%
Maximum | Equity Securities | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   60.00% 60.00%
Maximum | Equity Securities | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   25.00% 25.00%
Maximum | Fixed Income Investments | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   50.00% 50.00%
Maximum | Fixed Income Investments | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   50.00% 50.00%
Maximum | Other Investment | U.S. | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   15.00% 15.00%
Maximum | Other Investment | International | Pensions      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, target allocation, percentage   50.00% 50.00%