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Income taxes - Changes in Deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in net deferred tax liability during the year [abstract]      
Net deferred tax liability beginning balance $ 5,367.0 $ 5,213.0 $ 4,231.0
Charged (credited) to the Consolidated statement of income (381.0) 563.0 1,017.0
Charged (credited) to Other comprehensive income 98.0 (22.0) 38.0
Translation differences and other 446.0 (386.0) (73.0)
Net deferred tax liability ending balance 5,530.0 5,367.0 $ 5,213.0
Net deferred tax assets and liabilities [abstract]      
Deferred tax assets 3,881.0 3,304.0  
Deferred tax liabilities 9,410.0 8,671.0  
Deferred tax assets recognized in entities which have suffered a loss in either the current or preceding period $ 995.0 $ 1,868.0