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Discontinued operations (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Additions to property, plant and equipment $ 1,265 $ 1,474
Additions to right-of-use assets 346 537
Additions to intangible assets and goodwill $ 1,425 767
Discontinued operations    
Disclosure of operating segments [line items]    
Additions to property, plant and equipment   113
Additions to right-of-use assets   3
Additions to intangible assets and goodwill   $ 36