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Finance debt - Bonds (Details)
€ in Millions, $ in Millions
May 18, 2020
EUR (€)
Apr. 01, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
May 18, 2020
USD ($)
Disclosure of financial liabilities [line items]          
Bonds     $ 27,568 $ 30,994  
Euro (EUR) [Member]          
Disclosure of financial liabilities [line items]          
Bonds     7,925 10,057  
Pure [abstract]          
Bonds not swapped     846    
United States Dollar (USD) [Member]          
Disclosure of financial liabilities [line items]          
Bonds     17,451 $ 18,710  
Unsecured Bonds [Member] | United States Dollar (USD) [Member]          
Disclosure of financial liabilities [line items]          
Bonds     17,451    
Unsecured Bonds [Member] | All other currencies [Member]          
Pure [abstract]          
Bonds swapped     9,271    
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, 39 Bond agreements [Member]          
Disclosure of financial liabilities [line items]          
Bonds     $ 27,223