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Equity and Noncontrolling Interests - Narrative (Details)
€ / shares in Units, $ in Millions
1 Months Ended 11 Months Ended 12 Months Ended 13 Months Ended 14 Months Ended 23 Months Ended 35 Months Ended
Dec. 31, 2018
shares
Dec. 31, 2021
EUR (€)
€ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
shares
Dec. 31, 2019
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2021
EUR (€)
€ / shares
shares
Feb. 28, 2022
USD ($)
Jan. 25, 2021
USD ($)
Dec. 31, 2020
EUR (€)
€ / shares
shares
Jan. 22, 2019
USD ($)
Dec. 10, 2018
USD ($)
Class of Stock [Line Items]                            
Common stock, shares authorized, value | €   € 1,825,000             € 1,825,000     € 1,825,000    
Ordinary shares, authorized (in shares)   1,750,000,000   1,750,000,000       1,750,000,000 1,750,000,000     1,750,000,000    
Ordinary shares, par value (eur per share) | € / shares   € 0.001             € 0.001     € 0.001    
Ordinary shares, issued (in shares)   552,012,862   552,012,862       552,012,862 552,012,862     552,012,862    
Common stock, shares outstanding (in shares)   508,680,879   523,294,529       523,294,529 508,680,879     523,294,529    
Common stock shares issued (in shares)     0 0     958,293,000              
Additions (reductions) to noncontrolling interests | $     $ (876) $ (193) $ (2,921)                  
2018 Share Repurchase Program                            
Class of Stock [Line Items]                            
Additional common stock authorized for repurchase | $                           $ 1,000
Repurchased (in shares) 4,068,642         6,385,887                
2019 Share Repurchase Program                            
Class of Stock [Line Items]                            
Additional common stock authorized for repurchase | $                         $ 6,000  
Repurchased (in shares)               24,310,534 24,847,354          
2021 Share Repurchase Program                            
Class of Stock [Line Items]                            
Additional common stock authorized for repurchase | $                     $ 5,000      
Repurchased (in shares)   15,103,335                        
Afrox                            
Class of Stock [Line Items]                            
Additions (reductions) to noncontrolling interests | $       (196)                    
Linde AG                            
Class of Stock [Line Items]                            
Noncontrolling interest, ownership percentage by noncontrolling owners         8.00% 8.00% 8.00%              
Subsequent Event | 2022 Share Repurchase Program                            
Class of Stock [Line Items]                            
Additional common stock authorized for repurchase | $                   $ 10,000        
Noncontrolling Interests                            
Class of Stock [Line Items]                            
Additions (reductions) to noncontrolling interests | $     $ (876) (193) $ (2,921)                  
Dividends Payable | $       $ 35       $ 35            
Ordinary shares                            
Class of Stock [Line Items]                            
Ordinary shares, authorized (in shares)   1,750,000,000   1,750,000,000       1,750,000,000 1,750,000,000     1,750,000,000    
A Ordinary Shares                            
Class of Stock [Line Items]                            
Ordinary shares, authorized (in shares)   25,000   25,000       25,000 25,000     25,000    
Ordinary shares, par value (eur per share) | € / shares   € 1.00             € 1.00     € 1.00    
Deferred Stock                            
Class of Stock [Line Items]                            
Ordinary shares, authorized (in shares)   25,000   25,000       25,000 25,000     25,000    
Ordinary shares, par value (eur per share) | € / shares   € 1.00             € 1.00     € 1.00    
Preferred Stock                            
Class of Stock [Line Items]                            
Ordinary shares, authorized (in shares)   25,000,000   25,000,000       25,000,000 25,000,000     25,000,000    
Ordinary shares, par value (eur per share) | € / shares   € 0.001             € 0.001     € 0.001