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Equity (Details 5)
$ / shares in Units, Pure in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
year
$ / shares
Dec. 31, 2019
USD ($)
year
$ / shares
Dec. 31, 2018
USD ($)
year
$ / shares
Statement of changes in equity [abstract]      
(Increase)/decrease of treasury share repurchase obligation under a share buyback trading plan $ (1,769) $ 284 $ (284)
Transaction costs recorded in equity   (253) (79)
Tax on transaction costs recorded in equity   36 $ 20
Maximal amount of share buyback programm $ 2,500 $ 5,000  
Written call options held by market maker 1.0 13.0 11.0
Written call options, contractual live | year 10    
Written call options, contractual live, remaining | year 3 4 5
Written call options, weighted average exercise price | $ / shares $ 60.09 $ 63.90 $ 62.70
Amount recorded in equity related to hyperinflation $ 18 $ 22 $ 38
Number of options repurchased (3.7)