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Finance debt - Bonds (Details)
€ in Millions, $ in Millions
May 18, 2020
EUR (€)
Apr. 01, 2020
USD ($)
Nov. 13, 2019
USD ($)
Dec. 31, 2020
USD ($)
May 18, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of financial liabilities [line items]            
Bonds       $ 30,994   $ 23,666
Euro (EUR) [Member]            
Disclosure of financial liabilities [line items]            
Bonds       10,057   8,201
United States Dollar (USD) [Member]            
Disclosure of financial liabilities [line items]            
Bonds       18,710   $ 13,308
Unsecured Bonds [Member] | Euro (EUR) [Member]            
Pure [abstract]            
Bonds not swapped       916    
Unsecured Bonds [Member] | United States Dollar (USD) [Member]            
Disclosure of financial liabilities [line items]            
Bonds       18,710    
Unsecured Bonds [Member] | All other currencies [Member]            
Pure [abstract]            
Bonds swapped       11,368    
Bonds Maturing January 2026 [Member]            
Disclosure of financial liabilities [line items]            
Bonds         $ 750  
Pure [abstract]            
Interest rate in % 1.75%       1.75%  
Maturity date January 2026          
Bonds Maturing May 2026 [Member]            
Disclosure of financial liabilities [line items]            
Bonds | € € 750          
Pure [abstract]            
Interest rate in % 0.75%       0.75%  
Maturity date May 2026          
Bonds Maturing May 2030 [Member]            
Disclosure of financial liabilities [line items]            
Bonds         $ 750  
Pure [abstract]            
Interest rate in % 2.375%       2.375%  
Maturity date May 2030          
Bonds Maturing May 2032 [Member]            
Disclosure of financial liabilities [line items]            
Bonds | € € 1,000          
Pure [abstract]            
Interest rate in % 1.375%       1.375%  
Maturity date May 2032          
Bonds Maturing April 2025 [Member]            
Disclosure of financial liabilities [line items]            
Bonds   $ 1,250        
Pure [abstract]            
Interest rate in %   2.875%        
Maturity date   April 2025        
Bonds Maturing April 2027 [Member]            
Disclosure of financial liabilities [line items]            
Bonds   $ 500        
Pure [abstract]            
Interest rate in %   3.00%        
Maturity date   April 2027        
Bonds Maturing April 2030 [Member]            
Disclosure of financial liabilities [line items]            
Bonds   $ 1,500        
Pure [abstract]            
Interest rate in %   3.125%        
Maturity date   April 2030        
Bonds Maturing April 2040 [Member]            
Disclosure of financial liabilities [line items]            
Bonds   $ 500        
Pure [abstract]            
Interest rate in %   3.625%        
Maturity date   April 2040        
Bonds Maturity April 2050 [Member]            
Disclosure of financial liabilities [line items]            
Bonds   $ 1,250        
Pure [abstract]            
Interest rate in %   3.70%        
Maturity date   April 2050        
Unsecured bonds, 43 Bond agreements [Member]            
Disclosure of financial liabilities [line items]            
Bonds       $ 30,644    
Bonds Maturity November 2049 [member]            
Disclosure of financial liabilities [line items]            
Bonds     $ 1,000      
Pure [abstract]            
Interest rate in %     3.25%      
Maturity date     November 2049