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Discontinued operations (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [line items]      
Net cash flows used in investing activities from discontinued operations $ (127) $ (1,159) $ (1,001)
Net cash flows used in/from financing activities from discontinued operations (50) 3,257 (167)
Transaction cost payments (147) 56 67
Discontinued operations      
Statement [line items]      
Payments attributable to the spin-off of the Alcon business (39) (29)  
Divested cash and cash equivalents   (628)  
Cash flows attributable to divested business (39) (657)  
Other cash flows used in investing activities, net $ (88) (502) (1,001)
Cash inflow from borrowings   3,492 0
Transaction cost payments   $ 212 $ 57